تومي + إكليبس لينك:حقن EntityManager لا يعمل

StackOverflow https://stackoverflow.com//questions/10693905

سؤال

أحاول الحصول على هذا مثال JPA + EJB + Facelets يعمل في TomEE Web Profile.نظرًا لأن العينة تستخدم EclipseLink، فقد قمت بتنزيل EclipseLink ونسخه eclipselink/jlib/eclipselink.jar داخل ال TomEE/lib الدليل.

السؤال رقم 1: هل هذا هو الملف الوحيد الذي أحتاج إلى نسخه؟

لدي عدد من Entity الفئات، ووحدة JSF SessionScoped ManagedBean واحدة لخدمة طلبات الويب، وواحدة Stateful EJB للتعامل مع طلبات قاعدة البيانات، ووحدة EJB أخرى تقوم بتحميل البيانات إلى قاعدة البيانات عند بدء التشغيل.

فيما يلي مقتطفات التعليمات البرمجية الخاصة بـ ManagedBean وStateful EJB:

@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());
        }
    }
}

عندما الخط em.persist(part); عندما يحاول RequestBean التنفيذ، أحصل على الاستثناء التالي:

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

نظرًا لأنني لست على دراية بالسحر الذي يمثله Java EE، ليس لدي أي فكرة تقريبًا عن الخطأ الذي يحدث هنا، ولكني أرغب في معرفة سبب السطر الأول في تتبع المكدس، أعلاه:

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

السؤال 2: لسبب ما، يبدو أن حقن Entity Manager لا يعمل.هل لدى أي شخص أي فكرة لماذا؟

للاكتمال، أدناه هو بلدي persistence.xml, ، والذي في project/src/main/webapp/classes/META-INF/ الدليل:

<?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>

مصدر الرمز

في حالة رغبة أي شخص في رؤية بنية الدليل، وكود المصدر، وملفات التكوين، وما إلى ذلك.للمشروع، لقد قمت بتحميله على جيثب هنا.

هل كانت مفيدة؟

المحلول

محدث persistence.xml لاستخدام OpenJPA، وفقًا لـ خصائص موفر الثبات المشترك:

<?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>

لا يزال هناك الاستثناء التالي:

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)

من الواضح أن هذا خطأ معروف في TomEE 1.0.0 وقد تم حله في صندوق السيارة، لذا فأنا تحميل أحدث لقطة beta3

الآن كل شيء يسير على ما يرام.

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