Glassfish 3.1.2 "Could not resolve a persistence unit corresponding to the persistence-context-ref-name"

StackOverflow https://stackoverflow.com/questions/16242046

  •  13-04-2022
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Question

My project has the following structure:

EAR (derp.ear)
 |
 |____ derp-ui.war
 |
 |____ busctrl.jar
       |
       |____META-INF
               |
               |
               _______ persistence.xml (persistence name of "DEJPA")

The persistence.xml file:

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
    version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">

    <persistence-unit name="DEJPA" transaction-type="JTA">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <jta-data-source>jdbc/dejpaDS</jta-data-source>
    </persistence-unit>
</persistence>

I am making references to the Persistence Context as such:

@Named
public class ExampleDao implements ExampleDaoService {

    @PersistenceContext(name="DEJPA")
    protected EntityManager entityManager;
}

Despite this, I am getting the following stack trace when trying to deploy my EAR to a Glassfish 3.1.2 domain:

SEVERE: Exception while preparing the app : Could not resolve a persistence unit corresponding to the persistence-context-ref-name [DEJPA] in the scope of the module called [derp#derp-ui.war]. Please verify your application.
java.lang.RuntimeException: Could not resolve a persistence unit corresponding to the persistence-context-ref-name [DEJPA] in the scope of the module called [derp#derp-ui.war]. Please verify your application.
    at com.sun.enterprise.deployment.BundleDescriptor.findReferencedPUViaEMRef(BundleDescriptor.java:694)
    at com.sun.enterprise.deployment.BundleDescriptor.findReferencedPUsViaPCRefs(BundleDescriptor.java:682)
    at com.sun.enterprise.deployment.WebBundleDescriptor.findReferencedPUs(WebBundleDescriptor.java:1056)
    at org.glassfish.persistence.jpa.JPADeployer.createEMFs(JPADeployer.java:186)
    at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:168)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:871)
    at org.glassfish.javaee.full.deployment.EarDeployer.prepareBundle(EarDeployer.java:290)
    at org.glassfish.javaee.full.deployment.EarDeployer.access$200(EarDeployer.java:86)
    at org.glassfish.javaee.full.deployment.EarDeployer$1.doBundle(EarDeployer.java:141)
    at org.glassfish.javaee.full.deployment.EarDeployer$1.doBundle(EarDeployer.java:138)
    at org.glassfish.javaee.full.deployment.EarDeployer.doOnBundles(EarDeployer.java:215)
    at org.glassfish.javaee.full.deployment.EarDeployer.doOnAllTypedBundles(EarDeployer.java:224)
    at org.glassfish.javaee.full.deployment.EarDeployer.doOnAllBundles(EarDeployer.java:250)
    at org.glassfish.javaee.full.deployment.EarDeployer.prepare(EarDeployer.java:138)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:871)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:410)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:240)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:389)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:348)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:363)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1085)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:95)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1291)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1259)
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:461)
    at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:212)
    at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:179)
    at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$Hk2DispatcherCallable.call(ContainerMapper.java:354)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:619)

I have unpacked the EAR and verified that the file is present at the given location.

Please advise - I am wholly unconvinced by the suggestion by the log that the persistence.xml file which pertains to entities and DAOs within my JAR should infact be hosted within my WAR.

Was it helpful?

Solution

If busctrl.jar isn't a "deployed" component (containing EJBs) then move it into lib/busctrl.jar within the EAR file where it'll be visible on the classpath of the war file.

If it does contain EJBs, then some surgery needs to occur:

  • move EJBs definitions (implementations) into jar file(s) to be placed at the root level of the EAR file (/busEjb.jar).

  • move remote EJB declarations into their own JAR file to be placed in the EAR library (/lib/busEjbClient.jar).

  • move JPA entities & persistence.xml file into their own JAR file to be placed in the EAR library (/lib/busModel.jar).

Nothing in my review of the topic suggests that what you did in your original post shouldn't work in Glassfish, or other app servers. The class loader hierarchy should have made the persistence.xml file available.

That said, most discussions tend toward the best-practice of placing the persistence.xml file and entity classes into a separate library. I suspect this has to do with both the class loader hierarchy (possibly not a problem in this case) and with the internal search tooling to locate the persistence.xml file - which would be implemented by EclipseLink in this case. This discussion on EclipseLink may be relevant.

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