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最新推荐文章于 2025-08-08 22:07:46 发布

haike2006

最新推荐文章于 2025-08-08 22:07:46 发布

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分类专栏： J2EE 文章标签： hibernate exception server xml

本文链接：https://blog.youkuaiyun.com/haike2006/article/details/4087126

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本文介绍了一种常见的HTTP 500内部服务器错误，详细分析了由Hibernate框架引发的NullPointerException异常的原因，并提供了解决方案，即在Hibernate的XML映射文件中将多对一的关联设置为非懒加载。

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HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.lang.NullPointerException
	org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:535)
	org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:433)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.NullPointerException
	org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:372)
	org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:3121)
	org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:232)
	org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:173)
	org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)
	org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:862)
	org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:830)
	org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
	org.hibernate.type.EntityType.resolve(EntityType.java:303)
	org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:116)
	org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
	org.hibernate.loader.Loader.doQuery(Loader.java:717)
	org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
	org.hibernate.loader.Loader.doList(Loader.java:2145)
	org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
	org.hibernate.loader.Loader.list(Loader.java:2024)
	org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:94)
	org.hibernate.impl.SessionImpl.list(SessionImpl.java:1533)
	org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
	com.softbiz.spring.dao.OrdertempDAO.findPagerOfUngraded(OrdertempDAO.java:174)
	com.softbiz.struts.action.AdminAction.listUnauditUser(AdminAction.java:196)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	java.lang.reflect.Method.invoke(Method.java:597)
	org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:270)
	org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187)
	org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:110)
	org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
异常处理：

将hibernate xml 映射文件的多对一添加 lazy="false"