我试图写一个持久化实体的函数。它非常简单，但在持久化实体时会抛出java.lang.NoClassDefFoundError。我不明白为什么。
我整天都在RTFMed，为什么这么简单的代码不起作用，但只发现了java.lang.NoClassDefFoundError。
功能：
@Transactional(Transactional.TxType.REQUIRED)
public void commitTest1() {
try {
Replaces replaceEntry=new Replaces(6077, new Date(), "username");
replaceEntry.setAddId(1);
entityManager.persist(replaceEntry);
} catch (Throwable ex) {
ex.printStackTrace();
} finally {
}
}
实体类：
@Entity
@Table(name = "replaces")
@XmlRootElement
public class Replaces implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id")
private Integer id;
@Basic(optional = false)
@NotNull
@Column(name = "date")
@Temporal(TemporalType.TIMESTAMP)
private Date date;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 255)
@Column(name = "user")
private String user;
@Basic(optional = false)
@Column(name = "computer_id")
private Integer computerId;
@Basic(optional = true)
@Column(name = "remove_id")
private Integer removeId;
@Basic(optional = true)
@Column(name = "add_id")
private Integer addId;
//getters, setters
}
和persistence.xml：
<persistence-unit name="Sandbox-ejbPU" transaction-type="JTA">
<jta-data-source>jdbc/testdb</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties/>
</persistence-unit>
我将不胜感激任何帮助或建议。
更新：堆栈跟踪
Severe: java.lang.NoClassDefFoundError: sandbox/entities/Replaces
at sandbox.ReplacesTester.commitTest1(ReplacesTester.java:35)
at sandbox.ReplacesTester$Proxy$_$$_WeldSubclass.commitTest1(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.jboss.weld.interceptor.proxy.SimpleInterceptionChain.interceptorChainCompleted(SimpleInterceptionChain.java:47)
at org.jboss.weld.interceptor.chain.AbstractInterceptionChain.invokeNextInterceptor(AbstractInterceptionChain.java:80)
at org.jboss.weld.interceptor.proxy.InterceptorInvocationContext.proceed(InterceptorInvocationContext.java:141)
at org.glassfish.cdi.transaction.TransactionalInterceptorBase.proceed(TransactionalInterceptorBase.java:132)
at org.glassfish.cdi.transaction.TransactionalInterceptorRequired.transactional(TransactionalInterceptorRequired.java:95)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.jboss.weld.interceptor.proxy.SimpleMethodInvocation.invoke(SimpleMethodInvocation.java:30)
at org.jboss.weld.interceptor.chain.AbstractInterceptionChain.invokeNext(AbstractInterceptionChain.java:93)
at org.jboss.weld.interceptor.chain.AbstractInterceptionChain.invokeNextInterceptor(AbstractInterceptionChain.java:78)
at org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.executeInterception(InterceptorMethodHandler.java:48)
at org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.invoke(InterceptorMethodHandler.java:41)
at org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler.invoke(CombinedInterceptorAndDecoratorStackMethodHandler.java:53)
at sandbox.ReplacesTester$Proxy$_$$_WeldSubclass.commitTest1(Unknown Source)
at sandbox.ReplacesTester$Proxy$_$$_WeldClientProxy.commitTest1(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at javax.el.ELUtil.invokeMethod(ELUtil.java:326)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:536)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
at com.sun.el.parser.AstValue.invoke(AstValue.java:269)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
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:745)
Caused by: java.lang.ClassNotFoundException: sandbox.entities.Replaces
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1761)
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1611)
... 71 more
解决。我找到了该怎么做。我使用以下代码连接到构造函数中的DB：
//Any transaction will be rolled back in this case
EntityManagerFactory emf = Persistence.createEntityManagerFactory("IRM2EE-ejbPU");
entityManager = emf.createEntityManager();
我创建了无状态bean
@Stateless
@LocalBean
public class ConnectorDB {
@PersistenceContext(unitName = "Sandbox-ejbPU", type=PersistenceContextType.TRANSACTION)
private EntityManager entityManager;
public EntityManager getEntityManager() {
return entityManager;
}
//Voodoo code, the program doesn't work without that
//You will get Unable to retrieve EntityManagerFactory for unitName "Sandbox-ejbPU"
@PostConstruct
private void postConstructChores() {
Replaces replaceEntry=entityManager.find(Replaces.class, 9138);
}
}
我将其添加到托管bean中：
@EJB
private ConnectorDB connectorDB;
@PostConstruct
private void postConstructChores() {
entityManager=connectorDB.getEntityManager();
}
答案 0 :(得分：0)
您是否使用@Entity注释了Replaces.class？