我正在使用 Hibernate 4.0.1.Final。我正在使用 Assemby 插件将我的所有依赖项包含在我的 JAR 项目中。但是，Hibernate 无法找到我的一门课程，而且拼写正确。在我的 hibernate.cfg.xml 文件（位于我的 JAR 的根目录）中，我有
<mapping class="com.myco.fdr.myproject.model.UserRole" />
我像这样加载文件
final Configuration configuration = new AnnotationConfiguration();
configuration.configure("hibernate.cfg.xml");
但是当执行上面的代码时，我得到了这个异常......</p>
javax.ejb.EJBTransactionRolledbackException: Unable to load class declared as <mapping class="com.mainco.fdr.myco.model.UserRole"/> in the configuration:
at org.jboss.ejb3.tx.Ejb3TxPolicy.handleInCallerTx(Ejb3TxPolicy.java:87)
at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:130)
at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:195)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.mdb.MessagingContainer.localInvoke(MessagingContainer.java:249)
at org.jboss.ejb3.mdb.inflow.MessageInflowLocalProxy.delivery(MessageInflowLocalProxy.java:268)
at org.jboss.ejb3.mdb.inflow.MessageInflowLocalProxy.invoke(MessageInflowLocalProxy.java:138)
at $Proxy84.execute(Unknown Source)
at org.jboss.resource.adapter.quartz.inflow.QuartzJob.execute(QuartzJob.java:57)
at org.quartz.core.JobRunShell.run(JobRunShell.java:203)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)
Caused by: org.hibernate.MappingException: Unable to load class declared as <mapping class="com.mainco.fdr.myco.model.UserRole"/> in the configuration:
at org.hibernate.cfg.AnnotationConfiguration.parseMappingElement(AnnotationConfiguration.java:545)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1555)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1534)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1508)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1428)
at org.cbco.subco.dido.service.AbstractServiceProvider.getSessionFactory(AbstractServiceProvider.java:66)
at org.cbco.subco.dido.service.AbstractServiceProvider.initServices(AbstractServiceProvider.java:118)
at org.cbco.subco.dido.quartz.ProcessOrdersJob.execute(ProcessOrdersJob.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126)
... 11 more
Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: com.mainco.fdr.myco.model.UserRole
at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:100)
at org.hibernate.cfg.AnnotationConfiguration.parseMappingElement(AnnotationConfiguration.java:542)
... 31 more
有问题的类出现在我的 JAR 文件的根目录中（也许它应该出现在“类”目录中？）。无论如何，这就是我如何使用 Assembler 插件...</p>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2.1</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase> <!-- bind to the packaging phase -->
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
如何解决这个 ClassNotFoundException？