Eclipselink与MongoDB java.lang.ClassCastException

问题描述 投票：1回答：3

我正在尝试使用Eclipselink和MongoDB配置一个nosql持久性单元但是在部署期间我得到了以下堆栈异常;

...
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)

连接似乎已成功建立，但后来我得到一个java.lang.ClassCastException，连接被关闭。

persistence.xml中的我的PU看起来像这样：

<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>

我的NoSQL实体类;

    @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------------------------------------------------------------------

}

我使用CTM所以我在无状态会话bean中调用PU;

@Stateless
public class TicketDAOImpl implements TicketDAO {

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

}

我一直在关注qazxsw poi，但我找不到任何与此相关的内容。

mongodb eclipselink nosql
3个回答
3
投票

问题在于我的持久性单元。默认情况下，包含所有实体类，因此我的NoSQL和SQL实体都被传递给SQL和NoSQL持久性单元。解决方案只是指定persistence.xml持久性单元中的实体。

eclipselink guide
0
投票

我使用EclipseLink 2.6.0获得了ClassCastException。原来这是一个错误，它在2.6.1中修复

<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>

Bug：https://www.eclipse.org/eclipselink/downloads/milestones.php

注意：目前2.6.1尚未正式发布，但到目前为止它对我来说非常有用。

0
投票

我认为正确答案将包含https://www.eclipse.org/forums/index.php/t/1068464/字段中的true。换句话说，它将排除不属于NoSQL JPA的实体类。因此，persistence.xml应如下所示：

exclude-unlisted-classes
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