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edited Oct 31, 2014 at 21:30

facade pattern usage with jdbc-resource on glassfish

NetBeansProjects/EntAppWeb/
├── build.xml
├── EntAppWeb-ejb
│  ├── build.xml
│  ├── nbproject
│  │  ├── ant-deploy.xml
│  │  ├── build-impl.xml
│  │  ├── genfiles.properties
│  │  ├── private
│  │  │  ├── private.properties
│  │  │  └── private.xml
│  │  ├── project.properties
│  │  └── project.xml
│  └── src
│  └── conf
│  └── MANIFEST.MF
├── EntAppWeb-war
│  ├── build.xml
│  ├── nbproject
│  │  ├── ant-deploy.xml
│  │  ├── build-impl.xml
│  │  ├── genfiles.properties
│  │  ├── private
│  │  │  ├── private.properties
│  │  │  └── private.xml
│  │  ├── project.properties
│  │  └── project.xml
│  ├── setup
│  │  └── glassfish-resources.xml
│  ├── src
│  │  ├── conf
│  │  │  ├── MANIFEST.MF
│  │  │  └── persistence.xml
│  │  └── java
│  │  └── dur
│  │  ├── beans
│  │  │  ├── NextClient.java
│  │  │  └── NextClientLocal.java
│  │  └── jpa
│  │  ├── AbstractFacade.java
│  │  ├── ClientFacade.java
│  │  ├── ClientFacadeLocal.java
│  │  ├── Client.java
│  │  └── exceptions
│  │  ├── IllegalOrphanException.java
│  │  ├── NonexistentEntityException.java
│  │  ├── PreexistingEntityException.java
│  │  └── RollbackFailureException.java
│  └── web
│  ├── eagle.xhtml
│  ├── falcon.xhtml
│  ├── index.xhtml
│  ├── menu.xhtml
│  ├── next.xhtml
│  ├── parrot.xhtml
│  ├── template.xhtml
│  └── WEB-INF
│  └── web.xml
├── LICENSE
├── nbproject
│  ├── ant-deploy.xml
│  ├── build-impl.xml
│  ├── genfiles.properties
│  ├── private
│  │  ├── private.properties
│  │  └── private.xml
│  ├── project.properties
│  └── project.xml
├── README.md
└── src
 └── conf
 └── MANIFEST.MF

with this backing bean:

package dur.beans;
import dur.jpa.Client;
import dur.jpa.ClientFacadeLocal;
import javax.ejb.EJB;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Named;
@Named("nextClient")
@ApplicationScoped
public class NextClient implements NextClientLocal {
 @EJB
 private ClientFacadeLocal clientFacade;
 private int next = 1009;
 @Override
 public String getNext() {
 next++;
 Client client = clientFacade.find(next);
 return client.toString();
 }
}

and this facelets template client:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:f="http://java.sun.com/jsf/core"
 >
 <h:head></h:head>
 <h:body>
 This and everything before will be ignored
 <ui:composition template="template.xhtml">
 <ui:define name="navigation">
 <ui:include src="menu.xhtml"/>
 </ui:define>
 <ui:define name="main">
 <h1>bird</h1>
 <p>
 next #{nextClient.next}
 </p>
 </ui:define>
 </ui:composition>
 This and everything after will be ignored
 </h:body>
</html>

I want to move the dur.jpa package to its own project and use it as a library. Currently the database connection is done from within the Enterprise Application with:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
 <persistence-unit name="EntAppWeb-warPU" transaction-type="JTA">
 <jta-data-source>jdbc/legacy_resource</jta-data-source>
 <exclude-unlisted-classes>false</exclude-unlisted-classes>
 <properties>
 <property name="javax.persistence.schema-generation.database.action" value="create"/>
 </properties>
 </persistence-unit>
</persistence>

I still want to use the jdbc-resource on glassfish.

1.) Is it correct, within best practices, to use the jdbc-resource on glassfish?

2.) How would the Java SE library utilize the jdbc-resource on glassfish? How is the connection established?