TomEE + EclipseLink：EntityManager注入不起作用

我試圖讓這個JPA + EJB + Facelets example在TomEE Web Profile中運行。由於該示例使用EclipseLink，我下載了EclipseLink並將eclipselink/jlib/eclipselink.jar複製到TomEE/lib目錄中。TomEE + EclipseLink：EntityManager注入不起作用

問題1：這是我需要複製的唯一文件嗎？我有一個Entity類，一個JSF SessionScoped ManagedBean爲Web請求提供服務，一個有狀態的EJB來處理數據庫請求，另外還有一個EJB在啓動時將數據加載到數據庫中。

的ManagedBean和狀態EJB的代碼片段都低於：

@Singleton 
@Startup 
public class ConfigBean { 
    @EJB 
    private RequestBean request; 

    @PostConstruct 
    public void createData() { 
     request.createPart("1234-5678-01", 1, "ABC PART", new java.util.Date(), 
       "PARTQWERTYUIOPASXDCFVGBHNJMKL", null);  
     // more code here... 
    } 
} 

@Stateful 
public class RequestBean { 
    private static Logger logger = Logger.getLogger("order.ejb.RequestBean"); 
    @PersistenceContext 
    private EntityManager em; 

    public void createPart(String partNumber, int revision, String description, 
      java.util.Date revisionDate, String specification, 
      Serializable drawing) { 
     try { 
      Part part = new Part(partNumber, revision, description, 
        revisionDate, specification, drawing); 
      em.persist(part); // <--- EXCEPTION THROWN HERE 
     } catch (Exception ex) { 
      throw new EJBException(ex.getMessage()); 
     } 
    } 
}

當RequestBean行em.persist(part);嘗試執行，我得到以下異常：

WARNING: Injection: No such property 'order.ejb.RequestBean/em' in class order.ejb.RequestBean 
May 22, 2012 12:38:39 AM org.apache.openejb.core.transaction.EjbTransactionUtil handleSystemException 
SEVERE: The bean instance business method encountered a system exception: The transaction has been marked rollback only because the bean encountered a non-application exception :javax.ejb.EJBException : null 
javax.ejb.EJBTransactionRolledbackException: The transaction has been marked rollback only because the bean encountered a non-application exception :javax.ejb.EJBException : null 
    at org.apache.openejb.core.ivm.BaseEjbProxyHandler.convertException(BaseEjbProxyHandler.java:350) 
    at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:288) 
    at order.ejb.RequestBean$LocalBeanProxy.createPart(order/ejb/RequestBean.java) 
    at order.ejb.ConfigBean.createData(ConfigBean.java:35) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:601) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:181) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext$LifecycleInvocation.invoke(ReflectionInvocationContext.java:213) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:163) 
    at org.apache.openejb.monitoring.StatsInterceptor.record(StatsInterceptor.java:176) 
    at org.apache.openejb.monitoring.StatsInterceptor.PostConstruct(StatsInterceptor.java:104) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:601) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:181) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:163) 
    at org.apache.openejb.core.interceptor.InterceptorStack.invoke(InterceptorStack.java:138) 
    at org.apache.openejb.BeanContext.newInstance(BeanContext.java:1368) 
    at org.apache.openejb.core.singleton.SingletonInstanceManager.createInstance(SingletonInstanceManager.java:174) 
    at org.apache.openejb.core.singleton.SingletonInstanceManager.access$100(SingletonInstanceManager.java:66) 
    at org.apache.openejb.core.singleton.SingletonInstanceManager$1.call(SingletonInstanceManager.java:115) 
    at org.apache.openejb.core.singleton.SingletonInstanceManager$1.call(SingletonInstanceManager.java:113) 
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:166) 
    at org.apache.openejb.core.singleton.SingletonInstanceManager.getInstance(SingletonInstanceManager.java:124) 
    at org.apache.openejb.core.singleton.SingletonInstanceManager.initialize(SingletonInstanceManager.java:90) 
    at org.apache.openejb.core.singleton.SingletonInstanceManager.start(SingletonInstanceManager.java:81) 
    at org.apache.openejb.core.singleton.SingletonContainer.start(SingletonContainer.java:118) 
    at org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:795) 
    at org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:506) 
    at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:634) 
    at org.apache.tomee.catalina.TomcatWebAppBuilder.configureStart(TomcatWebAppBuilder.java:588) 
    at org.apache.tomee.catalina.GlobalListenerSupport.lifecycleEvent(GlobalListenerSupport.java:117) 
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) 
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) 
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1566) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1556) 
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:166) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
    at java.lang.Thread.run(Thread.java:722) 
Caused by: javax.ejb.EJBException 
    at order.ejb.RequestBean.createPart(RequestBean.java:59) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:601) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:181) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:163) 
    at org.apache.openejb.monitoring.StatsInterceptor.record(StatsInterceptor.java:176) 
    at org.apache.openejb.monitoring.StatsInterceptor.invoke(StatsInterceptor.java:95) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:601) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:181) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:163) 
    at org.apache.openejb.cdi.CdiInterceptor.invoke(CdiInterceptor.java:129) 
    at org.apache.openejb.cdi.CdiInterceptor.access$000(CdiInterceptor.java:45) 
    at org.apache.openejb.cdi.CdiInterceptor$1.call(CdiInterceptor.java:66) 
    at org.apache.openejb.cdi.CdiInterceptor.aroundInvoke(CdiInterceptor.java:72) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:601) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:181) 
    at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:163) 
    at org.apache.openejb.core.interceptor.InterceptorStack.invoke(InterceptorStack.java:138) 
    at org.apache.openejb.core.stateful.StatefulContainer.businessMethod(StatefulContainer.java:648) 
    at org.apache.openejb.core.stateful.StatefulContainer.invoke(StatefulContainer.java:353) 
    at org.apache.openejb.core.ivm.EjbObjectProxyHandler.synchronizedBusinessMethod(EjbObjectProxyHandler.java:260) 
    at org.apache.openejb.core.ivm.EjbObjectProxyHandler.businessMethod(EjbObjectProxyHandler.java:240) 
    at org.apache.openejb.core.ivm.EjbObjectProxyHandler._invoke(EjbObjectProxyHandler.java:91) 
    at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:284) 
    ... 45 more

。我不非常熟悉Java EE的魔力我幾乎不知道這裏出了什麼問題，但我很想知道上面堆棧跟蹤中的第一行是什麼造成的：

WARNING: Injection: No such property 'order.ejb.RequestBean/em' in class order.ejb.RequestBean

問題2：出於某種原因，實體管理器的注入似乎不起作用。任何人有任何想法爲什麼？

爲了完整起見，下面是我的persistence.xml，這是在project/src/main/webapp/classes/META-INF/目錄：

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="2.0" 
    xmlns="http://java.sun.com/xml/ns/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"> 
    <persistence-unit name="order" transaction-type="JTA"> 
     <jta-data-source>jdbc/__default</jta-data-source> 
     <properties> 
      <property name="eclipselink.ddl-generation" value="drop-and-create-tables" /> 
      <property name="eclipselink.ddl-generation.output-mode" 
       value="both" /> 
     </properties> 
    </persistence-unit> 
</persistence>

源代碼

如果任何人希望看到的目錄結構，源代碼，配置文件，該項目，我已經上傳到github here。

來源

2012-05-21 Alex Averbuch

我會集中努力去理解爲什麼em是空的。嘗試遵循一些關於該主題的TomEE專用教程。乍一看你的代碼看起來是正確的。如果其唯一屬性是EntityManager，請考慮製作RequestBean @Stateless。 – perissf

更新persistence.xml使用OpenJPA中，根據Common PersistenceProvider properties：

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="2.0" 
    xmlns="http://java.sun.com/xml/ns/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"> 
    <persistence-unit name="order" transaction-type="JTA"> 
     <jta-data-source>jdbc/__default</jta-data-source> 
     <properties> 
      <property name="openjpa.jdbc.SynchronizeMappings" 
       value="buildSchema(foreignKeys=true,schemaAction='dropDB,add')" /> 
      <property name="openjpa.jdbc.SchemaFactory" value="native(foreignKeys=true)" /> 
      <property name="openjpa.jdbc.MappingDefaults" 
       value="ForeignKeyDeleteAction=restrict, JoinForeignKeyDeleteAction=restrict" /> 
      <property name="openjpa.Log" value="DefaultLevel=TRACE,SQL=TRACE" /> 
     </properties> 
    </persistence-unit> 
</persistence>

仍然得到了以下異常：

INFO - Starting OpenJPA 2.2.0 
java.lang.NullPointerException 
     at order.web.OrderManager.getOrders(OrderManager.java:53) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:601) 
     at javax.el.BeanELResolver.getValue(BeanELResolver.java:64) 
     at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:58) 
     at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:169) 
     at org.apache.el.parser.AstValue.getValue(AstValue.java:169) 
     at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189) 
     at org.apache.myfaces.view.facelets.el.ContextAwareTagValueExpression.getValue(ContextAwareTagValueExpression.java:96) 
     at javax.faces.component._DeltaStateHelper.eval(_DeltaStateHelper.java:246) 
     at javax.faces.component.UIData.getValue(UIData.java:2031) 
     at javax.faces.component.UIData.createDataModel(UIData.java:1979) 
     at javax.faces.component.UIData.getDataModel(UIData.java:1956) 
     at javax.faces.component.UIData.getRowCount(UIData.java:478) 
     at org.apache.myfaces.shared.renderkit.html.HtmlTableRendererBase.encodeInnerHtml(HtmlTableRendererBase.java:366) 
     at org.apache.myfaces.shared.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlTableRendererBase.java:214) 
     at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:626) 
     at javax.faces.component.UIComponentBase.encodeAll(UIComponentBase.java:524) 
     at javax.faces.component.UIComponentBase.encodeAll(UIComponentBase.java:533) 
     at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(FaceletViewDeclarationLanguage.java:1908) 
     at org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:285) 
     at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:59) 
     at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:116) 
     at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:241) 
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:199) 
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225) 
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) 
     at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44) 
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) 
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
     at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999) 
     at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565) 
     at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307) 
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
     at java.lang.Thread.run(Thread.java:722)

顯然，這是在TomEE 1.0.0一個已知的bug已經在樹幹已經解決，所以我downloaded the latest beta3 snapshot

現在一切運行良好。

來源

2012-05-22 13:33:56

發生了什麼？ –

TomEE + EclipseLink：EntityManager注入不起作用

回答

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