Tomcat 托米+；EclipseLink:EntityManager注入不工作

我正试着让它在我的网络档案中运行。 由于示例使用EclipseLink，我下载了EclipseLink并将

EclipseLink/jlib/EclipseLink.jar

复制到

TomEE/lib

目录中

问题1:这是我需要复制的唯一文件吗

我有许多

实体

类，一个JSF SessionScoped ManagedBean来服务web请求，一个有状态EJB来处理数据库请求，还有一个EJB在启动时将数据加载到数据库中

ManagedBean和有状态EJB的代码片段如下：

@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());
        }
    }
}

由于我不太熟悉Java EE的魔力，我几乎不知道这里出了什么问题，但我很想知道是什么导致了堆栈跟踪中的第一行，如上所示：

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

问题2:由于某种原因，实体管理器的注入似乎不起作用。有人知道为什么吗

为了完整起见，下面是我的

persistence.xml

，它位于

project/src/main/webapp/classes/META-INF/

目录中：

<?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>

jdbc/_默认值

源代码

---

如果有人想查看项目的目录结构、源代码、配置文件等，我已将其上载到。

更新了

persistence.xml

以使用OpenJPA，根据：

显然，这是Tomee1.0.0中的一个已知错误，已经在trunk中解决了，所以我

---

现在一切正常。

我将集中精力理解em为null的原因。试着遵循一些关于这个主题的在线教程。您的代码乍一看似乎是正确的。如果RequestBean的唯一属性是实体管理器，请考虑让它“无状态”。发生了什么事？

<?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>

<?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>

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)