java - 在 AS7 中转换查找的 EJB View 时出现 ClassCastException

Question

我正在将 2 个 EAR 部署到 JBoss AS 7.1.0.Alpha1-SNAPSHOT(7.0.1.Final 后版本)。两者都部署良好。

我有一个 EJB Singleton 类打包在一个 JAR 中，在其中一个 EAR 中:

@Startup
@Singleton
// one of @Local(Store.class), @Remote(Store.class), @LocalBean
@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
@Transactional(TransactionPropagation.SUPPORTS)
public class StoreFront implements Store {
...


public interface Store {
...

部署时，它表示 EJB 绑定(bind)到:

"java:app/store-core-2011.1.2-SNAPSHOT/StoreFront"
"java:app/store-core-2011.1.2-SNAPSHOT/StoreFront!uk.co.magus.jam.store.core.Store"
"java:module/StoreFront"
"java:module/StoreFront!uk.co.magus.jam.store.core.Store"
"java:global/store-ear-2011.1.2-SNAPSHOT/store-core-2011.1.2-SNAPSHOT/StoreFront!uk.co.magus.jam.store.core.Store"
"java:global/store-ear-2011.1.2-SNAPSHOT/store-core-2011.1.2-SNAPSHOT/StoreFront"

到目前为止，还不错。当我尝试通过 JNDI 从 OTHER 部署的 EAR 中的 JAR 中的非 CDI、非 EJB 类查找它时，它只能在“全局”下的 JNDI 名称中找到——再次，预期。

但是，当我尝试将生成的对象转换为实际的接口(interface)类时:

Object lookupObject = new InitialContext().lookup(jndiName);
Store store = (StoreFront)lookupObject;

我得到以下异常:

11:17:52,402 ERROR [jam.core.link.LinkListener] (Thread-45) Exception when casting to Store after lookup with [java:global/store-ear-2011.1.2-SNAPSHOT/store-core-2011.1.2-SNAPSHOT/StoreFront]: java.lang.ClassCastException: jam.store.core.Store$$$view1 cannot be cast to jam.store.core.Store
    at jam.core.link.LinkListener.getStore(LinkListener.java:108) [core-jar-2011.1.2-SNAPSHOT.jar:]
    at jam.core.link.LinkListener.postLoad(LinkListener.java:27) [core-jar-2011.1.2-SNAPSHOT.jar:]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_07]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_07]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_07]
    at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_07]
    at org.hibernate.ejb.event.ListenerCallback.invoke(ListenerCallback.java:48)
    at org.hibernate.ejb.event.EntityCallbackHandler.callback(EntityCallbackHandler.java:96)
    at org.hibernate.ejb.event.EntityCallbackHandler.postLoad(EntityCallbackHandler.java:89)
    at org.hibernate.ejb.event.EJB3PostLoadEventListener.onPostLoad(EJB3PostLoadEventListener.java:49)
    at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:264)
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1012)
    at org.hibernate.loader.Loader.doQuery(Loader.java:889)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
    at org.hibernate.loader.Loader.loadEntity(Loader.java:2058)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:81)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:71)
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3686)
    at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:446)
    at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:427)
    at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:204)
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:251)
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:148)
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:947)
    at org.hibernate.internal.SessionImpl.get(SessionImpl.java:863)
    at org.hibernate.internal.SessionImpl.get(SessionImpl.java:856)
    at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:787)
    at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:762)
    at org.jboss.as.jpa.container.AbstractEntityManager.find(AbstractEntityManager.java:220) [jboss-as-jpa-7.1.0.Alpha1-SNAPSHOT.jar:7.1.0.Alpha1-SNAPSHOT]
    at jam.core.dao.GenericDAO.findById(GenericDAO.java:87) [core-jar-2011.1.2-SNAPSHOT.jar:]
    at harvest.service.HarvesterDAOUtil.loadLink(HarvesterDAOUtil.java:251) [harvest-sar-2011.1.2-SNAPSHOT.jar:]
    at harvest.service.1779224926$Proxy$_$$_WeldSubclass.loadLink(1779224926$Proxy$_$$_WeldSubclass.java) [harvest-sar-2011.1.2-SNAPSHOT.jar:]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_07]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_07]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_07]
    at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_07]
    at org.jboss.interceptor.proxy.SimpleInterceptionChain.invokeNextInterceptor(SimpleInterceptionChain.java:112) [jboss-interceptor-core-2.0.0.Alpha3.jar:2.0.0.Alpha3]
    at org.jboss.interceptor.proxy.InterceptorInvocationContext.proceed(InterceptorInvocationContext.java:119) [jboss-interceptor-core-2.0.0.Alpha3.jar:2.0.0.Alpha3]
    at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:194) [seam-persistence-3.0.0.Final.jar:]
    at org.jboss.seam.transaction.Work.workInTransaction(Work.java:54) [seam-persistence-3.0.0.Final.jar:]
    at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:188) [seam-persistence-3.0.0.Final.jar:]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_07]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_07]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_07]
    at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_07]
    at org.jboss.interceptor.proxy.InterceptorInvocation$InterceptorMethodInvocation.invoke(InterceptorInvocation.java:72) [jboss-interceptor-core-2.0.0.Alpha3.jar:2.0.0.Alpha3]
    at org.jboss.interceptor.proxy.SimpleInterceptionChain.invokeNextInterceptor(SimpleInterceptionChain.java:82) [jboss-interceptor-core-2.0.0.Alpha3.jar:2.0.0.Alpha3]
    at org.jboss.interceptor.proxy.InterceptorMethodHandler.executeInterception(InterceptorMethodHandler.java:133) [jboss-interceptor-core-2.0.0.Alpha3.jar:2.0.0.Alpha3]
    at org.jboss.interceptor.proxy.InterceptorMethodHandler.invoke(InterceptorMethodHandler.java:112) [jboss-interceptor-core-2.0.0.Alpha3.jar:2.0.0.Alpha3]
    at org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler.invoke(CombinedInterceptorAndDecoratorStackMethodHandler.java:65) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
    at harvest.service.1779224926$Proxy$_$$_WeldSubclass.loadLink(1779224926$Proxy$_$$_WeldSubclass.java) [harvest-sar-2011.1.2-SNAPSHOT.jar:]
    at harvest.service.CombineHarvester.workOnLinkId(CombineHarvester.java:259) [harvest-sar-2011.1.2-SNAPSHOT.jar:]
    at harvest.service.CombineHarvester.harvestCache(CombineHarvester.java:223) [harvest-sar-2011.1.2-SNAPSHOT.jar:]
    at harvest.service.CombineHarvester.performHarvest(CombineHarvester.java:136) [harvest-sar-2011.1.2-SNAPSHOT.jar:]
    at harvest.service.CombineHarvester.run(CombineHarvester.java:107) [harvest-sar-2011.1.2-SNAPSHOT.jar:]
    at java.lang.Thread.run(Thread.java:619) [:1.6.0_07]

EJB 是否使用以下任一注释

@Local(Store.class)
@Remote(Store.class)
@LocalBean 

没有区别。据我了解，它返回代理“ View ”这一事实是正常的。但是，我不应该能够将该 View 转换到界面上吗？我使用哪个全局 JNDI 名称的组合以及我是转换为 Store 还是 StoreFront 似乎也没有区别 - 无法转换任何组合，即使异常类似于 jam.store.core.Store$$$ view1 无法转换为具有匹配(基)类名称的 jam.store.core.Store

谁能指出我做错了什么？

Answer 1

这是 AS7 中的错误:https://issues.jboss.org/browse/AS7-1658

一种可能的解决方法是不强制转换返回的对象，然后使用它通过 reflection 触发方法.虽然很笨重。