使用JPA和EclipseLink的JNDI数据库连接

Question

我尝试在Tomcat 5.5上使用JNDI与eclipseLink/JPA结合设置Java数据库连接。我已经在web.xml和context.xml中配置了JNDI资源。

在不使用JPA和eclipseLink的情况下，JNDI可以正常工作。

但是在为eclipseLink配置persistence.xml后，我遇到了以下异常。

我不知道如何正确配置persistence.xml以使用JNDI数据源进行数据库连接。

异常信息：

WicketMessage: Method onFormSubmitted of interface      
org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component     
[MarkupContainer [Component id = loginForm]] threw an exception


Root cause:

javax.naming.NamingException: This context must be accessed throught a java: URL
at org.apache.naming.SelectorContext.parseName(SelectorContext.java:686)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:121)
at javax.naming.InitialContext.lookup(InitialContext.java:396)
at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:110)
at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:94)
at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:16    2)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(Datab    aseSessionImpl.java:579)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:228)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:380)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:157)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:214)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:202)
at de.company.myDs.controller.AbstractCrudController.getEntityManager(Unknown Source)
at de.company.myDs.controller.UserController.loadUserByName(Unknown Source)
at de.company.myDs.controller.LoginController.validateUserLogin(Unknown Source)
at de.company.myDs.pages.LoginPage$1.onSubmit(Unknown Source)
at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1534)
at org.apache.wicket.markup.html.form.Form.process(Form.java:934)
at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:896)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:312)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:873)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:637)

Complete stack:

org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component [MarkupContainer [Component id = loginForm]] threw an exception
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:193)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)

javax.persistence.PersistenceException: Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.1.0.v20100614-r7608): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Cannot acquire data source [java:comp/env/jdbc/myDs].
Internal Exception: javax.naming.NamingException: This context must be accessed throught a java: URL
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:408)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:157)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:214)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:202)
at de.company.myDs.controller.AbstractCrudController.getEntityManager(Unknown Source)
at de.company.myDs.controller.UserController.loadUserByName(Unknown Source)
at de.company.myDs.controller.LoginController.validateUserLogin(Unknown Source)
at de.company.myDs.pages.LoginPage$1.onSubmit(Unknown Source)
at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1534)
at org.apache.wicket.markup.html.form.Form.process(Form.java:934)
at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:896)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)

Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.1.0.v20100614-r7608): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Cannot acquire data source [java:comp/env/jdbc/myDs].
Internal Exception: javax.naming.NamingException: This context must be accessed throught a java: URL
at org.eclipse.persistence.exceptions.ValidationException.cannotAcquireDataSource(ValidationException.java:464)
at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:116)
at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:94)
at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:579)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:228)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:380)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:157)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:214)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:202)
at de.company.myDs.controller.AbstractCrudController.getEntityManager(Unknown Source)
at de.company.myDs.controller.UserController.loadUserByName(Unknown Source)
at de.company.myDs.controller.LoginController.validateUserLogin(Unknown Source)
at de.company.myDs.pages.LoginPage$1.onSubmit(Unknown Source)
at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1534)
at org.apache.wicket.markup.html.form.Form.process(Form.java:934)
at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:896)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)

web.xml

...
<resource-ref>
  <description>DB Connection</description>
  <res-ref-name>jdbc/myDs</res-ref-name>
  <res-type>javax.sql.DataSource</res-type>
  <res-auth>Container</res-auth>
</resource-ref>
...    

context.xml

...
<Resource
    name="jdbc/myDs"
    auth="Container"
    type="javax.sql.DataSource"
    maxActive="100"
    maxIdle="30"
    validationQuery="SELECT 1"
    testOnBorrow="true"
    testWhileIdle="true"
    timeBetweenEvictionRunsMillis="60000"
    minEvictableIdleTimeMillis="600000"
    username="root"
    password="passwd"
    maxWait="10000"
    driverClassName="org.postgresql.Driver"
    url="jdbc:postgresql://localhost:5432/myDs" />
...

persistence.xml

...    
<persistence-unit name="myDs" transaction-type="RESOURCE_LOCAL">

    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>

    <non-jta-data-source>java:comp/env/jdbc/myDs</non-jta-data-source>

    <exclude-unlisted-classes>false</exclude-unlisted-classes>

    <class>de.company.myDS.model.User</class>

</persistence-unit>
...

- 0xPixelfrost

Answer 1

只需将类JPAEclipseLinkSessionCustomizer添加到您的项目中，并像下面展示的那样配置文件：

<persistence-unit name="yourUnit" transaction-type="RESOURCE_LOCAL">

    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>

    <non-jta-data-source>java:comp/env/jdbc/yourDs</non-jta-data-source>        

    <properties>
        <property name="eclipselink.session.customizer" value="com.company.yourproject.yourpackage.JPAEclipseLinkSessionCustomizer"/>        
    </properties>

</persistence-unit>

你只需要在使用Apache Tomcat时采用这种解决方法。

- skanne

---

给定的链接没有响应。我在这里找到了文件的副本：http://code.google.com/p/buzzwords/source/browse/trunk/Buzzwords/maven/Buzzwords/src/main/java/com/buzzwords/utils/JPAEclipseLinkSessionCustomizer.java - Oscar Pérez

Answer 2

将数据源URL设置为"jdbc/myDs"
<non-jta-data-source>jdbc/myDs</non-jta-data-source>

- Gordon Yorke

---

这会导致另一个异常：javax.naming.NameNotFoundException: Name jdbc is not bound in this Context at org.apache.naming.NamingContext.lookup(NamingContext.java:770) at org.apache.naming.NamingContext.lookup(NamingContext.java:140) at org.apache.naming.SelectorContext.lookup(SelectorContext.java:121) at javax.naming.InitialContext.lookup(InitialContext.java:396) at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:110) at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:94) - 0xPixelfrost

Answer 3

希望您能够根据给出的评论解决问题...

我通过添加一个属性 "javax.persistence.nonJtaDataSource" ，并将其值设置为元素 non-jta-data-source 的值，来解决这个问题。

- JuanjoC

Answer 4

2015年更新：我不确定是否需要使用Eclipselink SessionCustomizer。在我的测试中，所有工作都没有问题（Tomcat 7.x，Java 7.x，Eclipselink 2.4.x）。

一些较旧的资料建议在Tomcat 5/6上存在特定问题，并提出了特殊的解决方法。

- Jacek Cz

Answer 5

我认为你需要编写一个解决方案来处理 javax.naming.NamingException: This context must be accessed throught a java: URL 异常，详见 http://wiki.eclipse.org/EclipseLink/Examples/JPA/Tomcat_Web_Tutorial#Session_Customizer

同时请参考此链接以调试问题

http://forums.java.net/jive/message.jspa?messageID=158622

- JoseK