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For this project:
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.
Is it correct, within best practices, to use the
jdbc-resourceon glassfish?How would the Java SE library utilize the
jdbc-resourceon glassfish? How is the connection established?
See also:
1 Answer 1
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2
There is no much code to review here, but I spotted that next is not thread-safe. You can use an AtomicInteger instead.
@EJB
private ClientFacadeLocal clientFacade;
private AtomicInteger next = new AtomicInteger(1009);
@Override
public String getNext() {
Client client = clientFacade.find(next.incrementAndGet());
return client.toString();
}
answered Oct 31, 2014 at 21:54
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\$\begingroup\$ how do you know that it's not thread safe? Or, rather, how would I learn to recognize that? \$\endgroup\$Thufir– Thufir2014年11月01日 22:02:34 +00:00Commented Nov 1, 2014 at 22:02
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\$\begingroup\$ @Thufir Read "Java Concurrency in Practice" \$\endgroup\$naXa stands with Ukraine– naXa stands with Ukraine2015年10月02日 22:32:25 +00:00Commented Oct 2, 2015 at 22:32
lang-java