另一个实体不能强制转换为 javassist-util-proxy-proxy
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时间：2020-08-13 08:47:50 来源:igfitidea点击:
Another entities-cannot-be-cast-to-javassist-util-proxy-proxy
提问by Tanc
Following thread [entities cannot be cast to javassist.util.proxy.Proxy, i do have now a server side error ( tks thomas) I wasn't able to face the real problem within my app.
跟随线程 [entities cannot be cast to javassist.util.proxy.Proxy，我现在有一个服务器端错误 (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.access00(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.access00(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)
What does this part means ?
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)
Error is on Manufacturers entity, but I am working on Fiches.
错误出在制造商实体上，但我正在研究 Fiches。
- Fiches is linked by a many-to-one relation with References
- References is linked by a many-to-one relation with Products
- Products is linked by a many-to-one relation with Manufacturers.
- Fiches 通过与 References 的多对一关系链接
- 引用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。
Could it be a problem with one of my proxies ?
我的一个代理可能有问题吗？
CEMFiches :( Line 52 is return fichesDAO.readbyPK(fichesPK);)
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;
}
IfichesDAOis ( @transactional is used )
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;
}
FichesImplis
FichesImpl是
@Transactional(readOnly=true)
public Fiches readbyPK(FichesPK fichesPK){
return (Fiches)getSessionFactory().getCurrentSession().get(Fiches.class, fichesPK);
}
FichesService:
服务：
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); }
}
回答by cuilei103
I encountered the same error and the strange thing is that all the other entities in my project run ok, except one. According to Boris the Spider's suggestion, I checked my project and found that there is a jar called weld-osgi-bundle.jar(in theJava EE 6Libraries, provided by myEclipse10.0)contains some javassist code which may be conflict with javassist-3.18.1-GA.jarin my web libraries. So I removed it, and the problem gets solved.
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，发现有一个名为weld-osgi-bundle.jar的jar（在Java EE 6Libraries中，由myEclipse10.0)包含一些javassist代码可能与javassist-3.18.1-GA.jar冲突in my web libraries. So I removed it, and the problem gets solved.
回答by sjohnr
I also hit this issue while attempting to render an entity as JSON using Spring's @ResponseBody annotation. The issue turned out to be a relationship annotated as @ManyToOne with a FetchType of LAZY. The error message was not at all helpful. Switching to EAGER fetch solved the problem.
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。事实证明，该问题是一个注释为 @ManyToOne 且 FetchType 为 LAZY 的关系。错误消息根本没有帮助。切换到 EAGER fetch 解决了这个问题。
It may be helpful to note that in my case, the target entity also had a relationship of @ManyToOne which was recursive (target table had a foreign key to itself) which was also mapped as LAZY. Both relationships had to be switched to EAGER to get the problem resolved.
注意到在我的情况下，目标实体也有一个@ManyToOne 的关系，它是递归的（目标表有一个指向它自己的外键），它也被映射为 LAZY，这可能会有所帮助。两种关系都必须切换到 EAGER 才能解决问题。
回答by Phyxx
So I ran into this issue, and I thought I would add some additional details for those who might have the same problem.
所以我遇到了这个问题，我想我会为那些可能有同样问题的人添加一些额外的细节。
I had a collection of dependencies, and one imported org.javassist:javassist:3.18.1-GA, while the other imported javassist:javassist:3.11.0.GA.
我有一组依赖项，一个是导入的org.javassist:javassist:3.18.1-GA，另一个是导入的javassist:javassist:3.11.0.GA.
Because of the different groups (it would seem that javassist:javassistbecame org.javassist:javassist), the build tool wasn't excluding one in favour of the other, and my WAR file had both.
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而支持另一个，而我的 WAR 文件同时拥有这两个。
I had to manually exclude the old javassist dependency, and once it was removed everything was fine.
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。
