另一个实体无法转换为 javassist-util-proxy-proxy答案

【问题标题】：Another entities-cannot-be-cast-to-javassist-util-proxy-proxy另一个实体无法转换为 javassist-util-proxy-proxy
【发布时间】：2014-02-22 15:55:56
【问题描述】：

以下线程 [实体无法转换为 javassist.util.proxy.Proxy，我现在确实有服务器端错误 (tks thomas) 我无法在我的应用程序中面对真正的问题。

java.lang.ClassCastException: org.nit.persistance.entities.Manufacturers_.$$_javassist_3 cannot be cast to javassist.util.proxy.Proxy
    at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy(JavassistLazyInitializer.java:148)
    at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.getProxy(JavassistProxyFactory.java:73)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:758)
    at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:4419)
    at org.hibernate.event.internal.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:333)
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:259)
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1017)
    at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:944)
    at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:671)
    at org.hibernate.type.EntityType.resolve(EntityType.java:489)
    at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:168)
    at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:137)
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1112)
    at org.hibernate.loader.Loader.processResultSet(Loader.java:969)
    at org.hibernate.loader.Loader.doQuery(Loader.java:917)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:348)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:318)
    at org.hibernate.loader.Loader.loadEntity(Loader.java:2143)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:82)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:72)
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3939)
    at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:461)
    at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:430)
    at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:207)
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:263)
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1017)
    at org.hibernate.internal.SessionImpl.access$2000(SessionImpl.java:173)
    at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2413)
    at org.hibernate.internal.SessionImpl.get(SessionImpl.java:913)
    at org.nit.persistance.dao.impl.FichesImpl.readbyPK(FichesImpl.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at com.sun.proxy.$Proxy13.readbyPK(Unknown Source)
    at org.nit.server.CEM.CEMFiches.fetch(CEMFiches.java:52)
    at org.nit.server.service.FichesService.fetch(FichesService.java:11)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.web.bindery.requestfactory.server.ReflectiveServiceLayer.invoke(ReflectiveServiceLayer.java:182)
    at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.invoke(ServiceLayerDecorator.java:111)
    at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.invoke(ServiceLayerDecorator.java:111)
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.processInvocationMessages(SimpleRequestProcessor.java:463)
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:233)
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:135)
    at com.google.web.bindery.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:133)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:324)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)java.lang.ClassCastException: org.nit.persistance.entitesManufacturers_.$$_javassist_3 cannot be cast to javassist.util.proxy.Proxy
    at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy(JavassistLazyInitializer.java:148)
    at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.getProxy(JavassistProxyFactory.java:73)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:758)
    at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:4419)
    at org.hibernate.event.internal.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:333)
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:259)
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1017)
    at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:944)
    at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:671)
    at org.hibernate.type.EntityType.resolve(EntityType.java:489)
    at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:168)
    at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:137)
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1112)
    at org.hibernate.loader.Loader.processResultSet(Loader.java:969)
    at org.hibernate.loader.Loader.doQuery(Loader.java:917)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:348)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:318)
    at org.hibernate.loader.Loader.loadEntity(Loader.java:2143)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:82)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:72)
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3939)
    at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:461)
    at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:430)
    at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:207)
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:263)
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1017)
    at org.hibernate.internal.SessionImpl.access$2000(SessionImpl.java:173)
    at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2413)
    at org.hibernate.internal.SessionImpl.get(SessionImpl.java:913)
    at org.nit.persistance.dao.impl.FichesImpl.readbyPK(FichesImpl.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at com.sun.proxy.$Proxy13.readbyPK(Unknown Source)
    at org.nit.server.CEM.CEMFiches.fetch(CEMFiches.java:52)
    at org.nit.server.service.FichesService.fetch(FichesService.java:11)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.web.bindery.requestfactory.server.ReflectiveServiceLayer.invoke(ReflectiveServiceLayer.java:182)
    at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.invoke(ServiceLayerDecorator.java:111)
    at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.invoke(ServiceLayerDecorator.java:111)
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.processInvocationMessages(SimpleRequestProcessor.java:463)
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:233)
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:135)
    at com.google.web.bindery.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:133)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:324)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)

这部分是什么意思？

at com.sun.proxy.$Proxy13.readbyPK(Unknown Source)
at org.nit.server.CEM.CEMFiches.fetch(CEMFiches.java:52)
at org.nit.server.service.FichesService.fetch(FichesService.java:11)

制造商实体出现错误，但我正在处理 Fiches。

Fiches 通过与 References 的多对一关系链接
参考通过与产品的多对一关系链接
产品通过与制造商的多对一关系链接。

可能是我的一个代理有问题吗？

CEMFiches :（第 52 行是 return fichesDAO.readbyPK(fichesPK);)

 public static Fiches fetch (String metier, String sitegeo, String cptdossier, Integer numligne) {
        if (fichesDAO == null) {
          HttpServletRequest request = RequestFactoryServlet.getThreadLocalRequest();
          ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(request.getSession().getServletContext());
          fichesDAO =context.getBean(IFichesDAO.class);

      }
        try {
                FichesPK fichesPK = new FichesPK(metier,sitegeo, cptdossier, numligne);
                return fichesDAO.readbyPK(fichesPK);
            } catch (PersistanceException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
      }

IfichesDAO 是（使用@transactional）

public interface IFichesDAO {
    @Transactional(readOnly=true)
    public void save(Fiches fiches) throws PersistanceException;
    public Fiches readbyPK(FichesPK fichesPK) throws PersistanceException;

}

FichesImpl 是

@Transactional(readOnly=true)
public Fiches readbyPK(FichesPK fichesPK){
    return (Fiches)getSessionFactory().getCurrentSession().get(Fiches.class, fichesPK);
}

FichesService：

public class FichesService
{
    public Fiches fetch(FichesPK id) { return CEMFiches.fetch(id); }
    public FichesPK fetchPK(FichesPK id) { return CEMFiches.fetchPK(id); }
    public Fiches fetch(String metier, String sitegeo, String cptdossier, Integer numligne) { return CEMFiches.fetch(metier, sitegeo, cptdossier, numligne); }


}

【问题讨论】：

您确定在类路径中拥有正确版本的 Javassist？当您在类路径上有两个版本并且它们进入飞行状态时，最常发生此错误。您应该在类路径上有一个带有 version >= 3.16 的 javassist.jar
@Boris the Spider 你完全正确！有 javassist-3.1 和 javassist-3.18.1-GA.jar 我确实按照你的建议删除了 3.1，它运行良好。非常感谢！
也为我工作。升级 Spring 和 Hibernate 后发生重复。

标签： java gwt proxy requestfactory many-to-one

【解决方案1】：

我在尝试使用 Spring 的 @ResponseBody 注释将实体呈现为 JSON 时也遇到了这个问题。问题原来是注释为@ManyToOne 的关系，其 FetchType 为 LAZY。错误消息根本没有帮助。切换到 EAGER fetch 解决了这个问题。

注意，在我的例子中，目标实体也有一个 @ManyToOne 关系，它是递归的（目标表有一个自身的外键），它也被映射为 LAZY。两种关系都必须切换到 EAGER 才能解决问题。

【讨论】：

【解决方案2】：

我遇到了同样的错误，奇怪的是我项目中的所有其他实体都运行正常，除了一个。根据Boris the Spider's suggestion，我检查了我的项目，发现有一个jar叫做weld-osgi-bundle.jar（在Java EE 6库中，由myEclipse10.0)提供，包含一些可能与javassist-3.18冲突的javassist代码.1-GA.jarin my web libraries. So I removed it, and the problem gets solved.

【讨论】：

【解决方案3】：

所以我遇到了这个问题，我想我会为可能有同样问题的人添加一些额外的细节。

我有一组依赖项，一个导入org.javassist:javassist:3.18.1-GA，另一个导入javassist:javassist:3.11.0.GA。

由于不同的组（似乎javassist:javassist 变成了org.javassist:javassist），构建工具并没有排除一个支持另一个，而我的 WAR 文件两者都有。

我不得不手动排除旧的 javassist 依赖项，一旦它被删除，一切都很好。

【讨论】：