Eclipselink 与 MongoDB java.lang.ClassCastException [英] Eclipselink with MongoDB java.lang.ClassCastException

问题描述

I'm trying to configure a nosql persistence unit using Eclipselink and MongoDB but Im getting the following stack exception during deployment;

...
SEVERE:   java.lang.ClassCastException: org.eclipse.persistence.nosql.adapters.mongo.MongoPlatform cannot be cast to org.eclipse.persistence.internal.databaseaccess.DatabasePlatform
    at org.eclipse.persistence.sequencing.TableSequence.onConnect(TableSequence.java:168)
    at org.eclipse.persistence.sequencing.Sequence.onConnect(Sequence.java:270)
    at org.eclipse.persistence.internal.sequencing.SequencingManager.onConnectSequences(SequencingManager.java:927)
    at org.eclipse.persistence.internal.sequencing.SequencingManager.onConnectInternal(SequencingManager.java:747)
    at org.eclipse.persistence.internal.sequencing.SequencingManager.onConnect(SequencingManager.java:700)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeSequencing(DatabaseSessionImpl.java:281)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:629)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:625)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:565)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:792)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.login(DatabaseSessionImpl.java:749)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:241)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:681)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:204)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:304)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:336)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:302)
    at org.glassfish.persistence.jpa.JPADeployer$2.visitPUD(JPADeployer.java:451)
    at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:510)
    at org.glassfish.persistence.jpa.JPADeployer.iterateInitializedPUsAtApplicationPrepare(JPADeployer.java:492)
    at org.glassfish.persistence.jpa.JPADeployer.event(JPADeployer.java:395)
    at org.glassfish.kernel.event.EventsImpl.send(EventsImpl.java:131)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:484)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:527)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:523)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:356)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:522)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:546)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1423)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1500(CommandRunnerImpl.java:108)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1762)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1674)
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
    at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
    at org.glassfish.grizzly.http.server.StaticHttpHandler.service(StaticHttpHandler.java:297)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:246)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
    at java.lang.Thread.run(Thread.java:722)

The connection seems to be successfully established but then I get a java.lang.ClassCastException and the connection gets closed.

My PU in the persistence.xml looks like this:

<persistence-unit name="NoSQL_PU" transaction-type="JTA">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="eclipselink.target-database" value="org.eclipse.persistence.nosql.adapters.mongo.MongoPlatform"/>
      <property name="eclipselink.nosql.connection-spec" value="org.eclipse.persistence.nosql.adapters.mongo.MongoConnectionSpec"/>
      <property name="eclipselink.nosql.property.mongo.port" value="27017"/>
      <property name="eclipselink.nosql.property.mongo.host" value="localhost"/>
      <property name="eclipselink.nosql.property.mongo.db" value="dev"/>
      <property name="eclipselink.logging.level" value="FINEST"/>
    </properties>
  </persistence-unit>

My NoSQL Entity class;

    @NamedQueries({
        @NamedQuery(name = "Comment.findAll", query = "SELECT e FROM Comment e"),
        @NamedQuery(name = "Comment.findByPK", query = "SELECT e FROM Comment e WHERE e.id = :id"),})
    @Entity
    @NoSql(dataFormat = DataFormatType.MAPPED)
    public class Comment implements Serializable {

    // Serial-------------------------------------------------------------------
    private static final long serialVersionUID = 1L;

    // Variables----------------------------------------------------------------
    @Id
    @GeneratedValue
    @Field(name="_id")
    private String id;
    @Basic
    private Long created;
    @Basic
    private String commenterId;
    @Basic
    private String comment;

    // Constructors-------------------------------------------------------------

    // Getters------------------------------------------------------------------

    // Setters------------------------------------------------------------------

}

Im using CTM so Im calling the PU in a stateless session bean;

@Stateless
public class TicketDAOImpl implements TicketDAO {

    @PersistenceContext(unitName = "NoSQL_PU")
    private EntityManager em;

}

Ive been following the eclipselink guide but I can't find anything pertaining to this.

解决方案

The problem was with my persistence unit. By default ALL the Entity classes are included, So both my NoSQL and SQL entities were being passed to both the SQL and the NoSQL persistence units. The solution was just to specify the entities inside the persistence.xml persistence unit.

<persistence-unit name="Dastrax_NoSQL_PU" transaction-type="JTA">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>declare_your_entity_1</class>
    <class>declare_your_entity_2</class>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="eclipselink.target-database" value="org.eclipse.persistence.nosql.adapters.mongo.MongoPlatform"/>
      <property name="eclipselink.nosql.connection-spec" value="org.eclipse.persistence.nosql.adapters.mongo.MongoConnectionSpec"/>
      <property name="eclipselink.nosql.property.mongo.port" value="27017"/>
      <property name="eclipselink.nosql.property.mongo.host" value="localhost"/>
      <property name="eclipselink.nosql.property.mongo.db" value="dev"/>
      <property name="eclipselink.logging.level" value="FINEST"/>
    </properties>
  </persistence-unit>

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