From: Roland Häder <roland@mxchange.org>
Date: Mon, 26 Jun 2017 21:43:25 +0000 (+0200)
Subject: Rewrite continued:
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=34c9c57c7f1660b51ff53e0379b86ac0234bc051;p=pizzaservice-ejb.git

Rewrite continued:
- Now all project-specific abstract web beans (controllers) inherit from BaseFacesBean to have these nice showFacesMessage() methods.
- Also all project-specific abstract EJBs inherit now only BaseDataBean (one was missing in an old project)
- So, if you have a WAR project, inherit from BaseFacesBean, if you have an EJB project, inherit from BaseDatabaseBean

Signed-off-by: Roland Häder <roland@mxchange.org>
---

diff --git a/src/java/org/mxchange/jmailee/model/delivery/PizzaEmailDeliveryMessageBean.java b/src/java/org/mxchange/jmailee/model/delivery/PizzaEmailDeliveryMessageBean.java
index f432fa3..fa4c43e 100644
--- a/src/java/org/mxchange/jmailee/model/delivery/PizzaEmailDeliveryMessageBean.java
+++ b/src/java/org/mxchange/jmailee/model/delivery/PizzaEmailDeliveryMessageBean.java
@@ -18,18 +18,20 @@ package org.mxchange.jmailee.model.delivery;
 
 import java.io.Serializable;
 import java.text.MessageFormat;
+import java.util.Properties;
+import java.util.ResourceBundle;
+import javax.annotation.PostConstruct;
 import javax.ejb.ActivationConfigProperty;
 import javax.ejb.MessageDriven;
 import javax.jms.JMSException;
 import javax.jms.Message;
 import javax.jms.MessageListener;
 import javax.jms.ObjectMessage;
-import javax.naming.Context;
-import javax.naming.InitialContext;
-import javax.naming.NamingException;
-import org.mxchange.jcoreeelogger.beans.local.logger.Log;
-import org.mxchange.jcoreeelogger.beans.local.logger.LoggerBeanLocal;
+import javax.mail.MessagingException;
 import org.mxchange.jmailee.model.delivery.wrapper.WrapableEmailDelivery;
+import org.mxchange.pizzaaplication.database.BasePizzaDatabaseBean;
+import org.mxchange.pizzaapplication.mailer.model.delivery.DeliverablePizzaEmail;
+import org.mxchange.pizzaapplication.mailer.model.delivery.PizzaMailer;
 
 /**
  * A message queue for sending out emails
@@ -44,81 +46,155 @@ import org.mxchange.jmailee.model.delivery.wrapper.WrapableEmailDelivery;
 			@ActivationConfigProperty (propertyName = "destinationType", propertyValue = "javax.jms.Queue")
 		}
 )
-public class PizzaEmailDeliveryMessageBean implements MessageListener {
+public class PizzaEmailDeliveryMessageBean extends BasePizzaDatabaseBean implements MessageListener {
 
 	/**
-	 * Logger bean
+	 * Serial number
 	 */
-	@Log
-	private LoggerBeanLocal loggerBeanLocal;
+	private static final long serialVersionUID = 190_586_572_658_143L;
+
+	/**
+	 * Configuration file
+	 */
+	private final String configFile = "org.mxchange.jmailer.config"; //NOI18N
+
+	/**
+	 * Mailer instance
+	 */
+	private final DeliverablePizzaEmail mailer;
 
 	/**
 	 * Default constructor
 	 */
 	public PizzaEmailDeliveryMessageBean () {
 		// Call super constructor
-		super();
+		super("jms/pizzaservice-queue-factory", "jms/pizzaservice-email-queue"); //NOI18N
 
-		try {
-			// Get initial context
-			Context context = new InitialContext();
-
-			// Lookup logger
-			this.loggerBeanLocal = (LoggerBeanLocal) context.lookup("java:global/jcore-logger-ejb/logger!org.mxchange.jcoreeelogger.beans.local.logger.LoggerBeanLocal"); //NOI18N
-		} catch (final NamingException ex) {
-			// Continue to throw
-			throw new RuntimeException(MessageFormat.format("context.lookup() failed: {0}", ex.getMessage()), ex); //NOI18N
+		// Init mailer instance
+		this.mailer = new PizzaMailer();
+	}
+
+	/**
+	 * Post-construction
+	 */
+	@PostConstruct
+	public void init () {
+		// Trace message
+		this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.init: CALLED!", this.getClass().getSimpleName())); //NOI18N
+
+		// Try to load bundle
+		ResourceBundle bundle = ResourceBundle.getBundle(this.configFile);
+
+		// Debug message
+		this.getLoggerBeanLocal().logDebug(MessageFormat.format("{0}.init: bundle={1}", this.getClass().getSimpleName(), bundle)); //NOI18N
+
+		// The bunble should be valid
+		if (null == bundle) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("bundle is null, maybe file {0} does not exist?", this.configFile)); //NOI18N
+		}
+
+		// Init Properties
+		Properties properties = new Properties();
+
+		// Is the bundle not empty?
+		if (!bundle.keySet().isEmpty()) {
+			// Loop through all
+			for (final String key : bundle.keySet()) {
+				// Log debug message
+				this.getLoggerBeanLocal().logDebug(MessageFormat.format("{0}.init: key={1}", this.getClass().getSimpleName(), key)); //NOI18N
+
+				// Get string from bundle and set it in properties
+				properties.put(key, bundle.getString(key));
+			}
 		}
+
+		// Handle it over to the mailer
+		this.mailer.init(properties);
+
+		// Trace message
+		this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.init: EXIT!", this.getClass().getSimpleName())); //NOI18N
 	}
 
 	@Override
 	public void onMessage (final Message message) {
 		// Trace message
-		this.loggerBeanLocal.logTrace(MessageFormat.format("onMessage: message={0} - CALLED!", message)); //NOI18N
+		this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.onMessage: message={1} - CALLED!", this.getClass().getSimpleName(), message)); //NOI18N
 
-		// Is the message castable to ObjectMessage?
+		// The parameter should be valid
 		if (null == message) {
-			// message is null
+			// Throw NPE
 			throw new NullPointerException("message is null"); //NOI18N
 		} else if (!(message instanceof ObjectMessage)) {
-			// Not castable
-			throw new ClassCastException(MessageFormat.format("message cannot be casted to ObjectMessage: {0}", message)); //NOI18N
+			// Not implementing right interface
+			throw new IllegalArgumentException(MessageFormat.format("message={0} does not implemented ObjectMessage", message)); //NOI18N
 		}
 
 		// Securely cast it
 		ObjectMessage objectMessage = (ObjectMessage) message;
 
-		// Init instance
-		Serializable object;
+		// Init variable
+		Serializable serializable;
 
 		try {
-			// Get object from it
-			object = objectMessage.getObject();
+			// Get object from message
+			serializable = objectMessage.getObject();
 		} catch (final JMSException ex) {
-			// Log exception ...
-			this.loggerBeanLocal.logException(ex);
-
-			// ... and don't continue
+			// Log it and don't continue any further
+			this.getLoggerBeanLocal().logException(ex);
 			return;
 		}
 
 		// Debug message
-		this.loggerBeanLocal.logDebug(MessageFormat.format("onMessage: object={0}", object)); //NOI18N
-
-		// Does this object implement WrapableCheckout ?
-		if (null == object) {
-			// object cannot be null
-			throw new NullPointerException("object is null"); //NOI18N
-		} else if (!(object instanceof WrapableEmailDelivery)) {
-			// Not proper interface used
-			throw new ClassCastException(MessageFormat.format("object does not implement WrapableEmailDelivery: {0}", object)); //NOI18N
+		this.getLoggerBeanLocal().logDebug(MessageFormat.format("{0}.onMessage: serializable={1}", this.getClass().getSimpleName(), serializable)); //NOI18N
+
+		// Okay, is it the right interface?
+		if (null == serializable) {
+			// Throw NPE
+			throw new NullPointerException("serializable is null"); //NOI18N
+		} else if (!(serializable instanceof WrapableEmailDelivery)) {
+			// Not correct object send
+			throw new IllegalArgumentException(MessageFormat.format("serializable={0} does not implement WrapableEmailDelivery", serializable)); //NOI18N
+		}
+
+		// Securely cast it
+		WrapableEmailDelivery wrapper = (WrapableEmailDelivery) serializable;
+
+		// Is all required set?
+		if (wrapper.getLocale() == null) {
+			// Throw NPE
+			throw new NullPointerException("wrapper.locale is null"); //NOI18N
+		} else if (wrapper.getRecipient() == null) {
+			// Throw again ...
+			throw new NullPointerException("wrapper.recipient is null"); //NOI18N
+		} else if (wrapper.getSubjectLine() == null) {
+			// ... and again
+			throw new NullPointerException("wrapper.subjectLine is null"); //NOI18N
+		} else if (wrapper.getSubjectLine().isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("wrapper.subjectLine is empty"); //NOI18N
+		} else if (wrapper.getTemplateName() == null) {
+			// Throw NPE again
+			throw new NullPointerException("wrapper.templateName is null"); //NOI18N
+		} else if (wrapper.getTemplateName().isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("wrapper.templateName is empty"); //NOI18N
+		} else if (wrapper.getTemplateVariables() == null) {
+			// No template variables set, should not happen
+			throw new NullPointerException("wrapper.templateVariables is null"); //NOI18N
 		}
 
-		// Cast the object to the wrapper interface
-		WrapableEmailDelivery emailDelivery = (WrapableEmailDelivery) object;
+		try {
+			// Send email out
+			this.mailer.sendDeliverableMail(wrapper);
+		} catch (final MessagingException ex) {
+			// Opps, something went wrong
+			this.getLoggerBeanLocal().logException(ex);
+			return;
+		}
 
 		// Trace message
-		this.loggerBeanLocal.logTrace("onMessage: EXIT!"); //NOI18N
+		this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.onMessage - EXIT!", this.getClass().getSimpleName())); //NOI18N
 	}
 
 }
diff --git a/src/java/org/mxchange/jusercore/model/user/activity/PizzaUserActivitySessionBean.java b/src/java/org/mxchange/jusercore/model/user/activity/PizzaUserActivitySessionBean.java
index f802f91..3f4aa6c 100644
--- a/src/java/org/mxchange/jusercore/model/user/activity/PizzaUserActivitySessionBean.java
+++ b/src/java/org/mxchange/jusercore/model/user/activity/PizzaUserActivitySessionBean.java
@@ -19,8 +19,13 @@ package org.mxchange.jusercore.model.user.activity;
 import java.text.MessageFormat;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
 import javax.ejb.EJBException;
 import javax.ejb.Stateless;
+import javax.faces.application.FacesMessage;
+import javax.faces.context.FacesContext;
 import javax.jms.JMSException;
 import javax.jms.ObjectMessage;
 import javax.persistence.Query;
@@ -35,7 +40,7 @@ import org.mxchange.jusercore.model.user.User;
  * @author Roland Häder<roland@mxchange.org>
  */
 @Stateless (name = "userActivity", description = "A bean handling the user data")
-public class PizzaUserActivitySessionBean extends BaseDatabaseBean implements UserActivityLogSessionBeanRemote {
+public abstract class PizzaUserActivitySessionBean extends BaseDatabaseBean implements UserActivityLogSessionBeanRemote {
 
 	/**
 	 * Serial number
@@ -227,4 +232,131 @@ public class PizzaUserActivitySessionBean extends BaseDatabaseBean implements Us
 		return list;
 	}
 
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 * @throws NumberFormatException If no number is given in context parameter
+	 */
+	protected int getIntegerContextParameter (final String parameterKey) throws NullPointerException, NumberFormatException {
+		// Get context parameter
+		Integer contextValue = Integer.parseInt(this.getStringContextParameter(parameterKey));
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 */
+	protected String getStringContextParameter (final String parameterKey) throws NullPointerException {
+		// Get context parameter
+		String contextValue = FacesContext.getCurrentInstance().getExternalContext().getInitParameter(parameterKey);
+		// Is it null?
+		if (null == contextValue) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("parameterKey={0} is not set.", parameterKey)); //NOI18N
+		}
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Checks whether debug mode is enabled for given controller
+	 * <p>
+	 * @param controllerName Name of controller
+	 * <p>
+	 * @return Whether debug mode is enabled
+	 */
+	protected boolean isDebugModeEnabled (final String controllerName) {
+		// Parameters should be valid
+		if (null == controllerName) {
+			// Throw NPE
+			throw new NullPointerException("controllerName is null"); //NOI18N
+		} else if (controllerName.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("controllerName is empty"); //NOI18N
+		}
+		// Try to get context parameter
+		String contextParameter = this.getStringContextParameter(String.format("is_debug_%s_enabled", controllerName)); //NOI18N
+		// Is it set and true?
+		boolean isEnabled = Boolean.parseBoolean(contextParameter) == Boolean.TRUE;
+		// Return it
+		return isEnabled;
+	}
+
+	/**
+	 * Loads resource bundle for given locale. This must be implemented per
+	 * project so all projects can still customize their methods. Calling
+	 * ResourceBundleloadBundle() in this class means that also the bundle files
+	 * must be present here.
+	 * <p>
+	 * @param locale Locale from e.g. FacesContext
+	 * <p>
+	 * @return Initialized and loaded resource bundle
+	 */
+	protected abstract ResourceBundle loadResourceBundle (final Locale locale);
+
+	/**
+	 * Shows a faces message for given causing exception. The message from the
+	 * exception is being inserted into the message.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param cause    Causing exception
+	 */
+	protected void showFacesMessage (final String clientId, final Throwable cause) {
+		// Get context and add message
+		this.showFacesMessage(clientId, cause.getMessage());
+	}
+
+	/**
+	 * Shows a faces message with given message (i18n) key.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param i18nKey  Message key
+	 * <p>
+	 * @throws NullPointerException If clientId or i18nKey is null
+	 * @throws IllegalArgumentException If clientId or i18nKey is empty
+	 */
+	protected void showFacesMessage (final String clientId, final String i18nKey) throws NullPointerException, IllegalArgumentException {
+		// Both parameter must be valid
+		if (null == clientId) {
+			// Throw NPE
+			throw new NullPointerException("clientId is null"); //NOI18N
+		} else if (clientId.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("clientId is null"); //NOI18N
+		} else if (null == i18nKey) {
+			// Throw NPE
+			throw new NullPointerException("i18nKey is null"); //NOI18N
+		} else if (i18nKey.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("i18nKey is null"); //NOI18N
+		}
+		// Get current locale
+		Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale();
+		// Get bundle bundle
+		ResourceBundle bundle = this.loadResourceBundle(locale);
+		// Default is i18nKey
+		String message = MessageFormat.format("!{0}!", i18nKey); //NOI18N
+		// Try it
+		try {
+			// Get message
+			message = bundle.getString(i18nKey);
+		} catch (final MissingResourceException ex) {
+			// Did not find it, ignored
+		}
+		// Get context and add message
+		FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(message));
+	}
+
 }
diff --git a/src/java/org/mxchange/pizzaapplication/model/basket/BasketSessionBean.java b/src/java/org/mxchange/pizzaapplication/model/basket/BasketSessionBean.java
index 8fc9dc7..53c2d12 100644
--- a/src/java/org/mxchange/pizzaapplication/model/basket/BasketSessionBean.java
+++ b/src/java/org/mxchange/pizzaapplication/model/basket/BasketSessionBean.java
@@ -19,7 +19,12 @@ package org.mxchange.pizzaapplication.model.basket;
 import java.text.MessageFormat;
 import java.util.GregorianCalendar;
 import java.util.List;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
 import javax.ejb.Stateless;
+import javax.faces.application.FacesMessage;
+import javax.faces.context.FacesContext;
 import javax.persistence.EntityExistsException;
 import org.mxchange.jcoreee.database.BaseDatabaseBean;
 import org.mxchange.jcustomercore.model.customer.Customer;
@@ -37,7 +42,7 @@ import org.mxchange.jshopcore.model.order.ShopOrder;
  * @author Roland Häder<roland@mxchange.org>
  */
 @Stateless (name = "basket", description = "A bean handling persisting baskets of logged-in customers")
-public class BasketSessionBean extends BaseDatabaseBean implements BasketSessionBeanRemote {
+public abstract class BasketSessionBean extends BaseDatabaseBean implements BasketSessionBeanRemote {
 
 	/**
 	 * Serial number
@@ -133,4 +138,131 @@ public class BasketSessionBean extends BaseDatabaseBean implements BasketSession
 		return accessKey;
 	}
 
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 * @throws NumberFormatException If no number is given in context parameter
+	 */
+	protected int getIntegerContextParameter (final String parameterKey) throws NullPointerException, NumberFormatException {
+		// Get context parameter
+		Integer contextValue = Integer.parseInt(this.getStringContextParameter(parameterKey));
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 */
+	protected String getStringContextParameter (final String parameterKey) throws NullPointerException {
+		// Get context parameter
+		String contextValue = FacesContext.getCurrentInstance().getExternalContext().getInitParameter(parameterKey);
+		// Is it null?
+		if (null == contextValue) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("parameterKey={0} is not set.", parameterKey)); //NOI18N
+		}
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Checks whether debug mode is enabled for given controller
+	 * <p>
+	 * @param controllerName Name of controller
+	 * <p>
+	 * @return Whether debug mode is enabled
+	 */
+	protected boolean isDebugModeEnabled (final String controllerName) {
+		// Parameters should be valid
+		if (null == controllerName) {
+			// Throw NPE
+			throw new NullPointerException("controllerName is null"); //NOI18N
+		} else if (controllerName.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("controllerName is empty"); //NOI18N
+		}
+		// Try to get context parameter
+		String contextParameter = this.getStringContextParameter(String.format("is_debug_%s_enabled", controllerName)); //NOI18N
+		// Is it set and true?
+		boolean isEnabled = Boolean.parseBoolean(contextParameter) == Boolean.TRUE;
+		// Return it
+		return isEnabled;
+	}
+
+	/**
+	 * Loads resource bundle for given locale. This must be implemented per
+	 * project so all projects can still customize their methods. Calling
+	 * ResourceBundleloadBundle() in this class means that also the bundle files
+	 * must be present here.
+	 * <p>
+	 * @param locale Locale from e.g. FacesContext
+	 * <p>
+	 * @return Initialized and loaded resource bundle
+	 */
+	protected abstract ResourceBundle loadResourceBundle (final Locale locale);
+
+	/**
+	 * Shows a faces message for given causing exception. The message from the
+	 * exception is being inserted into the message.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param cause    Causing exception
+	 */
+	protected void showFacesMessage (final String clientId, final Throwable cause) {
+		// Get context and add message
+		this.showFacesMessage(clientId, cause.getMessage());
+	}
+
+	/**
+	 * Shows a faces message with given message (i18n) key.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param i18nKey  Message key
+	 * <p>
+	 * @throws NullPointerException If clientId or i18nKey is null
+	 * @throws IllegalArgumentException If clientId or i18nKey is empty
+	 */
+	protected void showFacesMessage (final String clientId, final String i18nKey) throws NullPointerException, IllegalArgumentException {
+		// Both parameter must be valid
+		if (null == clientId) {
+			// Throw NPE
+			throw new NullPointerException("clientId is null"); //NOI18N
+		} else if (clientId.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("clientId is null"); //NOI18N
+		} else if (null == i18nKey) {
+			// Throw NPE
+			throw new NullPointerException("i18nKey is null"); //NOI18N
+		} else if (i18nKey.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("i18nKey is null"); //NOI18N
+		}
+		// Get current locale
+		Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale();
+		// Get bundle bundle
+		ResourceBundle bundle = this.loadResourceBundle(locale);
+		// Default is i18nKey
+		String message = MessageFormat.format("!{0}!", i18nKey); //NOI18N
+		// Try it
+		try {
+			// Get message
+			message = bundle.getString(i18nKey);
+		} catch (final MissingResourceException ex) {
+			// Did not find it, ignored
+		}
+		// Get context and add message
+		FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(message));
+	}
+
 }
diff --git a/src/java/org/mxchange/pizzaapplication/model/category/AdminCategorySessionBean.java b/src/java/org/mxchange/pizzaapplication/model/category/AdminCategorySessionBean.java
index 7032914..9e68174 100644
--- a/src/java/org/mxchange/pizzaapplication/model/category/AdminCategorySessionBean.java
+++ b/src/java/org/mxchange/pizzaapplication/model/category/AdminCategorySessionBean.java
@@ -17,7 +17,12 @@
 package org.mxchange.pizzaapplication.model.category;
 
 import java.text.MessageFormat;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
 import javax.ejb.Stateless;
+import javax.faces.application.FacesMessage;
+import javax.faces.context.FacesContext;
 import javax.persistence.EntityNotFoundException;
 import javax.persistence.NoResultException;
 import javax.persistence.Query;
@@ -34,7 +39,7 @@ import org.mxchange.jshopcore.model.category.AdminCategorySessionBeanRemote;
  * @author Roland Häder<roland@mxchange.org>
  */
 @Stateless (name = "admin_category", description = "An administrative bean handling product categories")
-public class AdminCategorySessionBean extends BaseDatabaseBean implements AdminCategorySessionBeanRemote {
+public abstract class AdminCategorySessionBean extends BaseDatabaseBean implements AdminCategorySessionBeanRemote {
 
 	/**
 	 * Serial number
@@ -135,4 +140,131 @@ public class AdminCategorySessionBean extends BaseDatabaseBean implements AdminC
 		return isUsed;
 	}
 
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 * @throws NumberFormatException If no number is given in context parameter
+	 */
+	protected int getIntegerContextParameter (final String parameterKey) throws NullPointerException, NumberFormatException {
+		// Get context parameter
+		Integer contextValue = Integer.parseInt(this.getStringContextParameter(parameterKey));
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 */
+	protected String getStringContextParameter (final String parameterKey) throws NullPointerException {
+		// Get context parameter
+		String contextValue = FacesContext.getCurrentInstance().getExternalContext().getInitParameter(parameterKey);
+		// Is it null?
+		if (null == contextValue) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("parameterKey={0} is not set.", parameterKey)); //NOI18N
+		}
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Checks whether debug mode is enabled for given controller
+	 * <p>
+	 * @param controllerName Name of controller
+	 * <p>
+	 * @return Whether debug mode is enabled
+	 */
+	protected boolean isDebugModeEnabled (final String controllerName) {
+		// Parameters should be valid
+		if (null == controllerName) {
+			// Throw NPE
+			throw new NullPointerException("controllerName is null"); //NOI18N
+		} else if (controllerName.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("controllerName is empty"); //NOI18N
+		}
+		// Try to get context parameter
+		String contextParameter = this.getStringContextParameter(String.format("is_debug_%s_enabled", controllerName)); //NOI18N
+		// Is it set and true?
+		boolean isEnabled = Boolean.parseBoolean(contextParameter) == Boolean.TRUE;
+		// Return it
+		return isEnabled;
+	}
+
+	/**
+	 * Loads resource bundle for given locale. This must be implemented per
+	 * project so all projects can still customize their methods. Calling
+	 * ResourceBundleloadBundle() in this class means that also the bundle files
+	 * must be present here.
+	 * <p>
+	 * @param locale Locale from e.g. FacesContext
+	 * <p>
+	 * @return Initialized and loaded resource bundle
+	 */
+	protected abstract ResourceBundle loadResourceBundle (final Locale locale);
+
+	/**
+	 * Shows a faces message for given causing exception. The message from the
+	 * exception is being inserted into the message.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param cause    Causing exception
+	 */
+	protected void showFacesMessage (final String clientId, final Throwable cause) {
+		// Get context and add message
+		this.showFacesMessage(clientId, cause.getMessage());
+	}
+
+	/**
+	 * Shows a faces message with given message (i18n) key.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param i18nKey  Message key
+	 * <p>
+	 * @throws NullPointerException If clientId or i18nKey is null
+	 * @throws IllegalArgumentException If clientId or i18nKey is empty
+	 */
+	protected void showFacesMessage (final String clientId, final String i18nKey) throws NullPointerException, IllegalArgumentException {
+		// Both parameter must be valid
+		if (null == clientId) {
+			// Throw NPE
+			throw new NullPointerException("clientId is null"); //NOI18N
+		} else if (clientId.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("clientId is null"); //NOI18N
+		} else if (null == i18nKey) {
+			// Throw NPE
+			throw new NullPointerException("i18nKey is null"); //NOI18N
+		} else if (i18nKey.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("i18nKey is null"); //NOI18N
+		}
+		// Get current locale
+		Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale();
+		// Get bundle bundle
+		ResourceBundle bundle = this.loadResourceBundle(locale);
+		// Default is i18nKey
+		String message = MessageFormat.format("!{0}!", i18nKey); //NOI18N
+		// Try it
+		try {
+			// Get message
+			message = bundle.getString(i18nKey);
+		} catch (final MissingResourceException ex) {
+			// Did not find it, ignored
+		}
+		// Get context and add message
+		FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(message));
+	}
+
 }
diff --git a/src/java/org/mxchange/pizzaapplication/model/category/CategorySessionBean.java b/src/java/org/mxchange/pizzaapplication/model/category/CategorySessionBean.java
index a970d79..683246f 100644
--- a/src/java/org/mxchange/pizzaapplication/model/category/CategorySessionBean.java
+++ b/src/java/org/mxchange/pizzaapplication/model/category/CategorySessionBean.java
@@ -18,7 +18,12 @@ package org.mxchange.pizzaapplication.model.category;
 
 import java.text.MessageFormat;
 import java.util.List;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
 import javax.ejb.Stateless;
+import javax.faces.application.FacesMessage;
+import javax.faces.context.FacesContext;
 import javax.persistence.Query;
 import org.mxchange.jcoreee.database.BaseDatabaseBean;
 import org.mxchange.jproduct.model.category.Category;
@@ -31,7 +36,7 @@ import org.mxchange.jshopcore.model.category.CategorySessionBeanRemote;
  * @author Roland Häder<roland@mxchange.org>
  */
 @Stateless (name = "category", description = "A bean handling categories for all others (non-admin)")
-public class CategorySessionBean extends BaseDatabaseBean implements CategorySessionBeanRemote {
+public abstract class CategorySessionBean extends BaseDatabaseBean implements CategorySessionBeanRemote {
 
 	/**
 	 * Serial number
@@ -71,4 +76,131 @@ public class CategorySessionBean extends BaseDatabaseBean implements CategorySes
 		return list;
 	}
 
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 * @throws NumberFormatException If no number is given in context parameter
+	 */
+	protected int getIntegerContextParameter (final String parameterKey) throws NullPointerException, NumberFormatException {
+		// Get context parameter
+		Integer contextValue = Integer.parseInt(this.getStringContextParameter(parameterKey));
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 */
+	protected String getStringContextParameter (final String parameterKey) throws NullPointerException {
+		// Get context parameter
+		String contextValue = FacesContext.getCurrentInstance().getExternalContext().getInitParameter(parameterKey);
+		// Is it null?
+		if (null == contextValue) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("parameterKey={0} is not set.", parameterKey)); //NOI18N
+		}
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Checks whether debug mode is enabled for given controller
+	 * <p>
+	 * @param controllerName Name of controller
+	 * <p>
+	 * @return Whether debug mode is enabled
+	 */
+	protected boolean isDebugModeEnabled (final String controllerName) {
+		// Parameters should be valid
+		if (null == controllerName) {
+			// Throw NPE
+			throw new NullPointerException("controllerName is null"); //NOI18N
+		} else if (controllerName.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("controllerName is empty"); //NOI18N
+		}
+		// Try to get context parameter
+		String contextParameter = this.getStringContextParameter(String.format("is_debug_%s_enabled", controllerName)); //NOI18N
+		// Is it set and true?
+		boolean isEnabled = Boolean.parseBoolean(contextParameter) == Boolean.TRUE;
+		// Return it
+		return isEnabled;
+	}
+
+	/**
+	 * Loads resource bundle for given locale. This must be implemented per
+	 * project so all projects can still customize their methods. Calling
+	 * ResourceBundleloadBundle() in this class means that also the bundle files
+	 * must be present here.
+	 * <p>
+	 * @param locale Locale from e.g. FacesContext
+	 * <p>
+	 * @return Initialized and loaded resource bundle
+	 */
+	protected abstract ResourceBundle loadResourceBundle (final Locale locale);
+
+	/**
+	 * Shows a faces message for given causing exception. The message from the
+	 * exception is being inserted into the message.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param cause    Causing exception
+	 */
+	protected void showFacesMessage (final String clientId, final Throwable cause) {
+		// Get context and add message
+		this.showFacesMessage(clientId, cause.getMessage());
+	}
+
+	/**
+	 * Shows a faces message with given message (i18n) key.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param i18nKey  Message key
+	 * <p>
+	 * @throws NullPointerException If clientId or i18nKey is null
+	 * @throws IllegalArgumentException If clientId or i18nKey is empty
+	 */
+	protected void showFacesMessage (final String clientId, final String i18nKey) throws NullPointerException, IllegalArgumentException {
+		// Both parameter must be valid
+		if (null == clientId) {
+			// Throw NPE
+			throw new NullPointerException("clientId is null"); //NOI18N
+		} else if (clientId.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("clientId is null"); //NOI18N
+		} else if (null == i18nKey) {
+			// Throw NPE
+			throw new NullPointerException("i18nKey is null"); //NOI18N
+		} else if (i18nKey.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("i18nKey is null"); //NOI18N
+		}
+		// Get current locale
+		Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale();
+		// Get bundle bundle
+		ResourceBundle bundle = this.loadResourceBundle(locale);
+		// Default is i18nKey
+		String message = MessageFormat.format("!{0}!", i18nKey); //NOI18N
+		// Try it
+		try {
+			// Get message
+			message = bundle.getString(i18nKey);
+		} catch (final MissingResourceException ex) {
+			// Did not find it, ignored
+		}
+		// Get context and add message
+		FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(message));
+	}
+
 }
diff --git a/src/java/org/mxchange/pizzaapplication/model/checkout/CheckoutMessageBean.java b/src/java/org/mxchange/pizzaapplication/model/checkout/CheckoutMessageBean.java
index 5bdc1b8..b2bfcbb 100644
--- a/src/java/org/mxchange/pizzaapplication/model/checkout/CheckoutMessageBean.java
+++ b/src/java/org/mxchange/pizzaapplication/model/checkout/CheckoutMessageBean.java
@@ -19,9 +19,14 @@ package org.mxchange.pizzaapplication.model.checkout;
 import java.io.Serializable;
 import java.text.MessageFormat;
 import java.util.List;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
 import javax.ejb.ActivationConfigProperty;
 import javax.ejb.EJB;
 import javax.ejb.MessageDriven;
+import javax.faces.application.FacesMessage;
+import javax.faces.context.FacesContext;
 import javax.jms.JMSException;
 import javax.jms.Message;
 import javax.jms.MessageListener;
@@ -53,7 +58,7 @@ import org.mxchange.jshopcore.wrapper.WrapableCheckout;
 			@ActivationConfigProperty (propertyName = "destinationLookup", propertyValue = "jms/shopCheckoutQueue")
 		}
 )
-public class CheckoutMessageBean extends BaseBean implements MessageListener {
+public abstract class CheckoutMessageBean extends BaseBean implements MessageListener {
 
 	/**
 	 * Serial number
@@ -212,4 +217,131 @@ public class CheckoutMessageBean extends BaseBean implements MessageListener {
 		this.loggerBeanLocal.logTrace("onMessage: EXIT!"); //NOI18N
 	}
 
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 * @throws NumberFormatException If no number is given in context parameter
+	 */
+	protected int getIntegerContextParameter (final String parameterKey) throws NullPointerException, NumberFormatException {
+		// Get context parameter
+		Integer contextValue = Integer.parseInt(this.getStringContextParameter(parameterKey));
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 */
+	protected String getStringContextParameter (final String parameterKey) throws NullPointerException {
+		// Get context parameter
+		String contextValue = FacesContext.getCurrentInstance().getExternalContext().getInitParameter(parameterKey);
+		// Is it null?
+		if (null == contextValue) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("parameterKey={0} is not set.", parameterKey)); //NOI18N
+		}
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Checks whether debug mode is enabled for given controller
+	 * <p>
+	 * @param controllerName Name of controller
+	 * <p>
+	 * @return Whether debug mode is enabled
+	 */
+	protected boolean isDebugModeEnabled (final String controllerName) {
+		// Parameters should be valid
+		if (null == controllerName) {
+			// Throw NPE
+			throw new NullPointerException("controllerName is null"); //NOI18N
+		} else if (controllerName.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("controllerName is empty"); //NOI18N
+		}
+		// Try to get context parameter
+		String contextParameter = this.getStringContextParameter(String.format("is_debug_%s_enabled", controllerName)); //NOI18N
+		// Is it set and true?
+		boolean isEnabled = Boolean.parseBoolean(contextParameter) == Boolean.TRUE;
+		// Return it
+		return isEnabled;
+	}
+
+	/**
+	 * Loads resource bundle for given locale. This must be implemented per
+	 * project so all projects can still customize their methods. Calling
+	 * ResourceBundleloadBundle() in this class means that also the bundle files
+	 * must be present here.
+	 * <p>
+	 * @param locale Locale from e.g. FacesContext
+	 * <p>
+	 * @return Initialized and loaded resource bundle
+	 */
+	protected abstract ResourceBundle loadResourceBundle (final Locale locale);
+
+	/**
+	 * Shows a faces message for given causing exception. The message from the
+	 * exception is being inserted into the message.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param cause    Causing exception
+	 */
+	protected void showFacesMessage (final String clientId, final Throwable cause) {
+		// Get context and add message
+		this.showFacesMessage(clientId, cause.getMessage());
+	}
+
+	/**
+	 * Shows a faces message with given message (i18n) key.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param i18nKey  Message key
+	 * <p>
+	 * @throws NullPointerException If clientId or i18nKey is null
+	 * @throws IllegalArgumentException If clientId or i18nKey is empty
+	 */
+	protected void showFacesMessage (final String clientId, final String i18nKey) throws NullPointerException, IllegalArgumentException {
+		// Both parameter must be valid
+		if (null == clientId) {
+			// Throw NPE
+			throw new NullPointerException("clientId is null"); //NOI18N
+		} else if (clientId.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("clientId is null"); //NOI18N
+		} else if (null == i18nKey) {
+			// Throw NPE
+			throw new NullPointerException("i18nKey is null"); //NOI18N
+		} else if (i18nKey.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("i18nKey is null"); //NOI18N
+		}
+		// Get current locale
+		Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale();
+		// Get bundle bundle
+		ResourceBundle bundle = this.loadResourceBundle(locale);
+		// Default is i18nKey
+		String message = MessageFormat.format("!{0}!", i18nKey); //NOI18N
+		// Try it
+		try {
+			// Get message
+			message = bundle.getString(i18nKey);
+		} catch (final MissingResourceException ex) {
+			// Did not find it, ignored
+		}
+		// Get context and add message
+		FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(message));
+	}
+
 }
diff --git a/src/java/org/mxchange/pizzaapplication/model/customer/ShopCustomerSessionBean.java b/src/java/org/mxchange/pizzaapplication/model/customer/ShopCustomerSessionBean.java
index b62c91c..b5be173 100644
--- a/src/java/org/mxchange/pizzaapplication/model/customer/ShopCustomerSessionBean.java
+++ b/src/java/org/mxchange/pizzaapplication/model/customer/ShopCustomerSessionBean.java
@@ -18,7 +18,12 @@ package org.mxchange.pizzaapplication.model.customer;
 
 import java.text.MessageFormat;
 import java.util.GregorianCalendar;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
 import javax.ejb.Stateless;
+import javax.faces.application.FacesMessage;
+import javax.faces.context.FacesContext;
 import javax.persistence.EntityNotFoundException;
 import org.mxchange.jcoreee.database.BaseDatabaseBean;
 import org.mxchange.jcustomercore.exceptions.CustomerAlreadyRegisteredException;
@@ -32,7 +37,7 @@ import org.mxchange.jcustomercore.model.customer.CustomerSessionBeanRemote;
  * @author Roland Häder<roland@mxchange.org>
  */
 @Stateless (name = "shop_customer", description = "A bean handling the customer data")
-public class ShopCustomerSessionBean extends BaseDatabaseBean implements CustomerSessionBeanRemote {
+public abstract class ShopCustomerSessionBean extends BaseDatabaseBean implements CustomerSessionBeanRemote {
 
 	/**
 	 * Serial number
@@ -150,4 +155,131 @@ public class ShopCustomerSessionBean extends BaseDatabaseBean implements Custome
 		return customer;
 	}
 
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 * @throws NumberFormatException If no number is given in context parameter
+	 */
+	protected int getIntegerContextParameter (final String parameterKey) throws NullPointerException, NumberFormatException {
+		// Get context parameter
+		Integer contextValue = Integer.parseInt(this.getStringContextParameter(parameterKey));
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 */
+	protected String getStringContextParameter (final String parameterKey) throws NullPointerException {
+		// Get context parameter
+		String contextValue = FacesContext.getCurrentInstance().getExternalContext().getInitParameter(parameterKey);
+		// Is it null?
+		if (null == contextValue) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("parameterKey={0} is not set.", parameterKey)); //NOI18N
+		}
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Checks whether debug mode is enabled for given controller
+	 * <p>
+	 * @param controllerName Name of controller
+	 * <p>
+	 * @return Whether debug mode is enabled
+	 */
+	protected boolean isDebugModeEnabled (final String controllerName) {
+		// Parameters should be valid
+		if (null == controllerName) {
+			// Throw NPE
+			throw new NullPointerException("controllerName is null"); //NOI18N
+		} else if (controllerName.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("controllerName is empty"); //NOI18N
+		}
+		// Try to get context parameter
+		String contextParameter = this.getStringContextParameter(String.format("is_debug_%s_enabled", controllerName)); //NOI18N
+		// Is it set and true?
+		boolean isEnabled = Boolean.parseBoolean(contextParameter) == Boolean.TRUE;
+		// Return it
+		return isEnabled;
+	}
+
+	/**
+	 * Loads resource bundle for given locale. This must be implemented per
+	 * project so all projects can still customize their methods. Calling
+	 * ResourceBundleloadBundle() in this class means that also the bundle files
+	 * must be present here.
+	 * <p>
+	 * @param locale Locale from e.g. FacesContext
+	 * <p>
+	 * @return Initialized and loaded resource bundle
+	 */
+	protected abstract ResourceBundle loadResourceBundle (final Locale locale);
+
+	/**
+	 * Shows a faces message for given causing exception. The message from the
+	 * exception is being inserted into the message.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param cause    Causing exception
+	 */
+	protected void showFacesMessage (final String clientId, final Throwable cause) {
+		// Get context and add message
+		this.showFacesMessage(clientId, cause.getMessage());
+	}
+
+	/**
+	 * Shows a faces message with given message (i18n) key.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param i18nKey  Message key
+	 * <p>
+	 * @throws NullPointerException If clientId or i18nKey is null
+	 * @throws IllegalArgumentException If clientId or i18nKey is empty
+	 */
+	protected void showFacesMessage (final String clientId, final String i18nKey) throws NullPointerException, IllegalArgumentException {
+		// Both parameter must be valid
+		if (null == clientId) {
+			// Throw NPE
+			throw new NullPointerException("clientId is null"); //NOI18N
+		} else if (clientId.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("clientId is null"); //NOI18N
+		} else if (null == i18nKey) {
+			// Throw NPE
+			throw new NullPointerException("i18nKey is null"); //NOI18N
+		} else if (i18nKey.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("i18nKey is null"); //NOI18N
+		}
+		// Get current locale
+		Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale();
+		// Get bundle bundle
+		ResourceBundle bundle = this.loadResourceBundle(locale);
+		// Default is i18nKey
+		String message = MessageFormat.format("!{0}!", i18nKey); //NOI18N
+		// Try it
+		try {
+			// Get message
+			message = bundle.getString(i18nKey);
+		} catch (final MissingResourceException ex) {
+			// Did not find it, ignored
+		}
+		// Get context and add message
+		FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(message));
+	}
+
 }
diff --git a/src/java/org/mxchange/pizzaapplication/model/product/AdminProductSessionBean.java b/src/java/org/mxchange/pizzaapplication/model/product/AdminProductSessionBean.java
index 6c14c62..d584147 100644
--- a/src/java/org/mxchange/pizzaapplication/model/product/AdminProductSessionBean.java
+++ b/src/java/org/mxchange/pizzaapplication/model/product/AdminProductSessionBean.java
@@ -18,7 +18,12 @@ package org.mxchange.pizzaapplication.model.product;
 
 import java.text.MessageFormat;
 import java.util.List;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
 import javax.ejb.Stateless;
+import javax.faces.application.FacesMessage;
+import javax.faces.context.FacesContext;
 import javax.persistence.EntityExistsException;
 import javax.persistence.EntityNotFoundException;
 import javax.persistence.NoResultException;
@@ -36,7 +41,7 @@ import org.mxchange.jshopcore.model.product.AdminProductSessionBeanRemote;
  * @author Roland Häder<roland@mxchange.org>
  */
 @Stateless (name = "admin_product", description = "An administrative bean handling products")
-public class AdminProductSessionBean extends BaseDatabaseBean implements AdminProductSessionBeanRemote {
+public abstract class AdminProductSessionBean extends BaseDatabaseBean implements AdminProductSessionBeanRemote {
 
 	/**
 	 * Serial number
@@ -162,4 +167,131 @@ public class AdminProductSessionBean extends BaseDatabaseBean implements AdminPr
 		return isUsed;
 	}
 
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 * @throws NumberFormatException If no number is given in context parameter
+	 */
+	protected int getIntegerContextParameter (final String parameterKey) throws NullPointerException, NumberFormatException {
+		// Get context parameter
+		Integer contextValue = Integer.parseInt(this.getStringContextParameter(parameterKey));
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 */
+	protected String getStringContextParameter (final String parameterKey) throws NullPointerException {
+		// Get context parameter
+		String contextValue = FacesContext.getCurrentInstance().getExternalContext().getInitParameter(parameterKey);
+		// Is it null?
+		if (null == contextValue) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("parameterKey={0} is not set.", parameterKey)); //NOI18N
+		}
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Checks whether debug mode is enabled for given controller
+	 * <p>
+	 * @param controllerName Name of controller
+	 * <p>
+	 * @return Whether debug mode is enabled
+	 */
+	protected boolean isDebugModeEnabled (final String controllerName) {
+		// Parameters should be valid
+		if (null == controllerName) {
+			// Throw NPE
+			throw new NullPointerException("controllerName is null"); //NOI18N
+		} else if (controllerName.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("controllerName is empty"); //NOI18N
+		}
+		// Try to get context parameter
+		String contextParameter = this.getStringContextParameter(String.format("is_debug_%s_enabled", controllerName)); //NOI18N
+		// Is it set and true?
+		boolean isEnabled = Boolean.parseBoolean(contextParameter) == Boolean.TRUE;
+		// Return it
+		return isEnabled;
+	}
+
+	/**
+	 * Loads resource bundle for given locale. This must be implemented per
+	 * project so all projects can still customize their methods. Calling
+	 * ResourceBundleloadBundle() in this class means that also the bundle files
+	 * must be present here.
+	 * <p>
+	 * @param locale Locale from e.g. FacesContext
+	 * <p>
+	 * @return Initialized and loaded resource bundle
+	 */
+	protected abstract ResourceBundle loadResourceBundle (final Locale locale);
+
+	/**
+	 * Shows a faces message for given causing exception. The message from the
+	 * exception is being inserted into the message.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param cause    Causing exception
+	 */
+	protected void showFacesMessage (final String clientId, final Throwable cause) {
+		// Get context and add message
+		this.showFacesMessage(clientId, cause.getMessage());
+	}
+
+	/**
+	 * Shows a faces message with given message (i18n) key.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param i18nKey  Message key
+	 * <p>
+	 * @throws NullPointerException If clientId or i18nKey is null
+	 * @throws IllegalArgumentException If clientId or i18nKey is empty
+	 */
+	protected void showFacesMessage (final String clientId, final String i18nKey) throws NullPointerException, IllegalArgumentException {
+		// Both parameter must be valid
+		if (null == clientId) {
+			// Throw NPE
+			throw new NullPointerException("clientId is null"); //NOI18N
+		} else if (clientId.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("clientId is null"); //NOI18N
+		} else if (null == i18nKey) {
+			// Throw NPE
+			throw new NullPointerException("i18nKey is null"); //NOI18N
+		} else if (i18nKey.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("i18nKey is null"); //NOI18N
+		}
+		// Get current locale
+		Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale();
+		// Get bundle bundle
+		ResourceBundle bundle = this.loadResourceBundle(locale);
+		// Default is i18nKey
+		String message = MessageFormat.format("!{0}!", i18nKey); //NOI18N
+		// Try it
+		try {
+			// Get message
+			message = bundle.getString(i18nKey);
+		} catch (final MissingResourceException ex) {
+			// Did not find it, ignored
+		}
+		// Get context and add message
+		FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(message));
+	}
+
 }
diff --git a/src/java/org/mxchange/pizzaapplication/model/product/ProductSessionBean.java b/src/java/org/mxchange/pizzaapplication/model/product/ProductSessionBean.java
index ef1ce7f..96fdb09 100644
--- a/src/java/org/mxchange/pizzaapplication/model/product/ProductSessionBean.java
+++ b/src/java/org/mxchange/pizzaapplication/model/product/ProductSessionBean.java
@@ -20,8 +20,13 @@ import java.text.MessageFormat;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
 import javax.ejb.EJB;
 import javax.ejb.Stateless;
+import javax.faces.application.FacesMessage;
+import javax.faces.context.FacesContext;
 import org.mxchange.jcoreee.database.BaseDatabaseBean;
 import org.mxchange.jproduct.model.product.Product;
 import org.mxchange.jshopcore.model.product.AdminProductSessionBeanRemote;
@@ -33,7 +38,7 @@ import org.mxchange.jshopcore.model.product.ProductSessionBeanRemote;
  * @author Roland Häder<roland@mxchange.org>
  */
 @Stateless (name = "product", description = "A bean handling products for all others (non-admin)")
-public class ProductSessionBean extends BaseDatabaseBean implements ProductSessionBeanRemote {
+public abstract class ProductSessionBean extends BaseDatabaseBean implements ProductSessionBeanRemote {
 
 	/**
 	 * Serial number
@@ -102,4 +107,131 @@ public class ProductSessionBean extends BaseDatabaseBean implements ProductSessi
 		return deque;
 	}
 
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 * @throws NumberFormatException If no number is given in context parameter
+	 */
+	protected int getIntegerContextParameter (final String parameterKey) throws NullPointerException, NumberFormatException {
+		// Get context parameter
+		Integer contextValue = Integer.parseInt(this.getStringContextParameter(parameterKey));
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 */
+	protected String getStringContextParameter (final String parameterKey) throws NullPointerException {
+		// Get context parameter
+		String contextValue = FacesContext.getCurrentInstance().getExternalContext().getInitParameter(parameterKey);
+		// Is it null?
+		if (null == contextValue) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("parameterKey={0} is not set.", parameterKey)); //NOI18N
+		}
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Checks whether debug mode is enabled for given controller
+	 * <p>
+	 * @param controllerName Name of controller
+	 * <p>
+	 * @return Whether debug mode is enabled
+	 */
+	protected boolean isDebugModeEnabled (final String controllerName) {
+		// Parameters should be valid
+		if (null == controllerName) {
+			// Throw NPE
+			throw new NullPointerException("controllerName is null"); //NOI18N
+		} else if (controllerName.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("controllerName is empty"); //NOI18N
+		}
+		// Try to get context parameter
+		String contextParameter = this.getStringContextParameter(String.format("is_debug_%s_enabled", controllerName)); //NOI18N
+		// Is it set and true?
+		boolean isEnabled = Boolean.parseBoolean(contextParameter) == Boolean.TRUE;
+		// Return it
+		return isEnabled;
+	}
+
+	/**
+	 * Loads resource bundle for given locale. This must be implemented per
+	 * project so all projects can still customize their methods. Calling
+	 * ResourceBundleloadBundle() in this class means that also the bundle files
+	 * must be present here.
+	 * <p>
+	 * @param locale Locale from e.g. FacesContext
+	 * <p>
+	 * @return Initialized and loaded resource bundle
+	 */
+	protected abstract ResourceBundle loadResourceBundle (final Locale locale);
+
+	/**
+	 * Shows a faces message for given causing exception. The message from the
+	 * exception is being inserted into the message.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param cause    Causing exception
+	 */
+	protected void showFacesMessage (final String clientId, final Throwable cause) {
+		// Get context and add message
+		this.showFacesMessage(clientId, cause.getMessage());
+	}
+
+	/**
+	 * Shows a faces message with given message (i18n) key.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param i18nKey  Message key
+	 * <p>
+	 * @throws NullPointerException If clientId or i18nKey is null
+	 * @throws IllegalArgumentException If clientId or i18nKey is empty
+	 */
+	protected void showFacesMessage (final String clientId, final String i18nKey) throws NullPointerException, IllegalArgumentException {
+		// Both parameter must be valid
+		if (null == clientId) {
+			// Throw NPE
+			throw new NullPointerException("clientId is null"); //NOI18N
+		} else if (clientId.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("clientId is null"); //NOI18N
+		} else if (null == i18nKey) {
+			// Throw NPE
+			throw new NullPointerException("i18nKey is null"); //NOI18N
+		} else if (i18nKey.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("i18nKey is null"); //NOI18N
+		}
+		// Get current locale
+		Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale();
+		// Get bundle bundle
+		ResourceBundle bundle = this.loadResourceBundle(locale);
+		// Default is i18nKey
+		String message = MessageFormat.format("!{0}!", i18nKey); //NOI18N
+		// Try it
+		try {
+			// Get message
+			message = bundle.getString(i18nKey);
+		} catch (final MissingResourceException ex) {
+			// Did not find it, ignored
+		}
+		// Get context and add message
+		FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(message));
+	}
+
 }
diff --git a/src/java/org/mxchange/pizzaapplication/model/receipt/PdfReceiptSessionBean.java b/src/java/org/mxchange/pizzaapplication/model/receipt/PdfReceiptSessionBean.java
index 2097dc8..e8ee770 100644
--- a/src/java/org/mxchange/pizzaapplication/model/receipt/PdfReceiptSessionBean.java
+++ b/src/java/org/mxchange/pizzaapplication/model/receipt/PdfReceiptSessionBean.java
@@ -17,7 +17,12 @@
 package org.mxchange.pizzaapplication.model.receipt;
 
 import java.text.MessageFormat;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
 import javax.ejb.Stateless;
+import javax.faces.application.FacesMessage;
+import javax.faces.context.FacesContext;
 import javax.naming.Context;
 import javax.naming.InitialContext;
 import javax.naming.NamingException;
@@ -36,7 +41,7 @@ import org.mxchange.jshopreceipt.receipt.Receipt;
  * @author Roland Häder<roland@mxchange.org>
  */
 @Stateless (name = "pdf", description = "A bean creating PDF receipts")
-public class PdfReceiptSessionBean extends BaseDatabaseBean implements ReceiptBeanRemote {
+public abstract class PdfReceiptSessionBean extends BaseDatabaseBean implements ReceiptBeanRemote {
 
 	/**
 	 * Serial number
@@ -136,4 +141,131 @@ public class PdfReceiptSessionBean extends BaseDatabaseBean implements ReceiptBe
 		this.customer = customer;
 	}
 
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 * @throws NumberFormatException If no number is given in context parameter
+	 */
+	protected int getIntegerContextParameter (final String parameterKey) throws NullPointerException, NumberFormatException {
+		// Get context parameter
+		Integer contextValue = Integer.parseInt(this.getStringContextParameter(parameterKey));
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Returns given property key or throws an exception if not found.
+	 * <p>
+	 * @param parameterKey Property key
+	 * <p>
+	 * @return Property value
+	 * <p>
+	 * @throws NullPointerException If given key is not found
+	 */
+	protected String getStringContextParameter (final String parameterKey) throws NullPointerException {
+		// Get context parameter
+		String contextValue = FacesContext.getCurrentInstance().getExternalContext().getInitParameter(parameterKey);
+		// Is it null?
+		if (null == contextValue) {
+			// Throw NPE
+			throw new NullPointerException(MessageFormat.format("parameterKey={0} is not set.", parameterKey)); //NOI18N
+		}
+		// Return it
+		return contextValue;
+	}
+
+	/**
+	 * Checks whether debug mode is enabled for given controller
+	 * <p>
+	 * @param controllerName Name of controller
+	 * <p>
+	 * @return Whether debug mode is enabled
+	 */
+	protected boolean isDebugModeEnabled (final String controllerName) {
+		// Parameters should be valid
+		if (null == controllerName) {
+			// Throw NPE
+			throw new NullPointerException("controllerName is null"); //NOI18N
+		} else if (controllerName.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("controllerName is empty"); //NOI18N
+		}
+		// Try to get context parameter
+		String contextParameter = this.getStringContextParameter(String.format("is_debug_%s_enabled", controllerName)); //NOI18N
+		// Is it set and true?
+		boolean isEnabled = Boolean.parseBoolean(contextParameter) == Boolean.TRUE;
+		// Return it
+		return isEnabled;
+	}
+
+	/**
+	 * Loads resource bundle for given locale. This must be implemented per
+	 * project so all projects can still customize their methods. Calling
+	 * ResourceBundleloadBundle() in this class means that also the bundle files
+	 * must be present here.
+	 * <p>
+	 * @param locale Locale from e.g. FacesContext
+	 * <p>
+	 * @return Initialized and loaded resource bundle
+	 */
+	protected abstract ResourceBundle loadResourceBundle (final Locale locale);
+
+	/**
+	 * Shows a faces message for given causing exception. The message from the
+	 * exception is being inserted into the message.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param cause    Causing exception
+	 */
+	protected void showFacesMessage (final String clientId, final Throwable cause) {
+		// Get context and add message
+		this.showFacesMessage(clientId, cause.getMessage());
+	}
+
+	/**
+	 * Shows a faces message with given message (i18n) key.
+	 * <p>
+	 * @param clientId Client id to send message to
+	 * @param i18nKey  Message key
+	 * <p>
+	 * @throws NullPointerException If clientId or i18nKey is null
+	 * @throws IllegalArgumentException If clientId or i18nKey is empty
+	 */
+	protected void showFacesMessage (final String clientId, final String i18nKey) throws NullPointerException, IllegalArgumentException {
+		// Both parameter must be valid
+		if (null == clientId) {
+			// Throw NPE
+			throw new NullPointerException("clientId is null"); //NOI18N
+		} else if (clientId.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("clientId is null"); //NOI18N
+		} else if (null == i18nKey) {
+			// Throw NPE
+			throw new NullPointerException("i18nKey is null"); //NOI18N
+		} else if (i18nKey.isEmpty()) {
+			// Is empty
+			throw new IllegalArgumentException("i18nKey is null"); //NOI18N
+		}
+		// Get current locale
+		Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale();
+		// Get bundle bundle
+		ResourceBundle bundle = this.loadResourceBundle(locale);
+		// Default is i18nKey
+		String message = MessageFormat.format("!{0}!", i18nKey); //NOI18N
+		// Try it
+		try {
+			// Get message
+			message = bundle.getString(i18nKey);
+		} catch (final MissingResourceException ex) {
+			// Did not find it, ignored
+		}
+		// Get context and add message
+		FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(message));
+	}
+
 }