jboss 4.0.4上运行ejb3+jsf的工程。
ejb部分分层为：实体bean，dao和manager，jsf分层为backing bean和展示层。
在manager层有interface EntityManager，并EntityManagerBean实现他，在EntityManagerBean中通过
@EJB注入dao，manager层则通过storeObject(Object)--> dao.storeObject(Object)完成中间的过度操作
，dao中用函数storeObject(Object){em.persist()}持久化对象。
具体有定义一个stateless的bean，
@Stateless
@Remote({EmployeeManager.class})
@Local({EmployeeManager.class})
public class EmployeeManagerBean implements EmployeeManager {
在jsf的backing bean层，通过lookup查找jndi。
EmployeeManager em = (EmployeeManager)ctx.lookup( "log/EmployeeManagerBean/remote ");可以确定
的是，这个查找已经成功返回了。
但问题出现了，
当我用通过查找并cast的EmployeeManager em来em.storeObject()会出现异常：
Caused by: java.lang.ClassCastException: org.jboss.remoting.InvokerLocator
at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke
(InvokeRemoteInterceptor.java:47)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke
(ClientTxPropagationInterceptor.java:61)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.security.SecurityClientInterceptor.invoke
(SecurityClientInterceptor.java:55)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:65)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke
(StatelessRemoteProxy.java:102)
at $Proxy311.storeObject(Unknown Source)
花了很多时间去google，大都讲到和class loader相关。但，试的结果都还不行。
在http://www.jboss.org/index.html?
module=bb&op=viewtopic&t=101108&postdays=0&postorder=asc&start=0上，有这样的回答：
You probably have a classloader issue. Looks like the code that does the casting is in a
servlet. You do not, by any chance, have the APLEntityFacade class in both the EJB jar file
and in a jar file (or in the classes directory) in your war file?
还有：
Peter-
Nice catch... that was indeed the problem. I forgot about that whole "class identity = class
+ classloader " thing, and was lazy about how I had configured ant. There are also some
useful wiki pages on this and other potential classloader issues:
http://wiki.jboss.org/wiki/Wiki.jsp?page=ClassLoadingOverview
因为对jboss刚接触不久，对于上面的e文理解不透彻？我要怎样解决呢？
------解决方法--------------------------------------------------------
Object objref = initial.lookup(CodedNames.TX_EJBHOME);
EmployeeManager em =(EmployeeManager) PortableRemoteObject.narrow(objref,
LocalTxHome.class);
------解决方法--------------------------------------------------------
我的经验是，EJB重新部署后，WEB应用也重新部署一下就行了
------解决方法--------------------------------------------------------
我的经验是java.lang.ClassCastException一般是因为装载的classloader不一致，你可以跟踪一下，WEB应用的classloader和业务层的classlaoder通常是不一样的,让一个WEB的对业务层的是可见的。
------解决方法--------------------------------------------------------
试试这个吧，把
deploy\jbossweb-tomcat55.sar\META-INF\jboss-service.xml
的 UseJBossWebLoader 改为true，再重启服务器看看
