java.lang.NullPointerException at org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEn

这个问题很奇怪，如果 只查询单个对象的话，结果就没有问题，但是如果 进行复合查找的话，就会报如下错误。

在网上百度了下，找到了解决办法，就是将查询对象相关对象表映射文件设置lazy="false"，即取消延迟加载。

下面是 延迟加载的百度词条：

延迟加载(lazy load)是(也称为懒加载)Hibernate3关联关系对象默认的加载方式，延迟加载机制是为了避免一些无谓的性能开销而提出来的，所谓延迟加载就是当在真正需要数据的时候，才真正执行数据加载操作。可以简单理解为，只有在使用的时候，才会发出sql语句进行查询。

　　延迟加载的有效期是在session打开的情况下，当session关闭后，会报异常。当调用load方法加载对象时，返回代理对象，等到真正用到对象的内容时才发出sql语句。

　　Hibernate2实现延迟加载有2种方式：1.实体对象 2.集合　　

Hibernate3中又引入了一种新的加载方式：3.属性的延迟加载

想想出现这个问题的原因应该是在延迟加载的时候，hibernate 的session会话已经关闭，因此就不能加载其他表的数据了。

而不延迟加载的话，在查询主表的时候，顺带的就把其他附表的兑现也一起创建了。

不过不理解的是为什么没有报与hibernate session 有关的异常呢。

1. java.lang.NullPointerException
2. at org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:372)
3. at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:3121)
4. at org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:232)
5. at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:173)
6. at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)
7. at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:862)
8. at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:830)
9. at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
10. at org.hibernate.type.EntityType.resolve(EntityType.java:303)
11. at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:116)
12. at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
13. at org.hibernate.loader.Loader.doQuery(Loader.java:717)
14. at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
15. at org.hibernate.loader.Loader.loadEntity(Loader.java:1785)
16. at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:47)
17. at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:41)
18. at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:2730)
19. at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:365)
20. at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:346)
21. at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:123)
22. at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:161)
23. at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)
24. at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:862)
25. at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:830)
26. at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
27. at org.hibernate.type.EntityType.resolve(EntityType.java:303)
28. at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:116)
29. at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
30. at org.hibernate.loader.Loader.doQuery(Loader.java:717)
31. at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
32. at org.hibernate.loader.Loader.doList(Loader.java:2145)
33. at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
34. at org.hibernate.loader.Loader.list(Loader.java:2024)
35. at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:375)
36. at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:308)
37. at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:153)
38. at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1106)
39. at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
40. at org.springframework.orm.hibernate3.HibernateTemplate$29.doInHibernate(HibernateTemplate.java:849)
41. at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:372)
42. at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:840)
43. at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:832)
44. at com.blog.DAO.Impl.PassageDAOImpl.findByUserInfo(PassageDAOImpl.java:220)
45. at com.blog.Services.Impl.PassageServiceImpl.ListPassageListByUserinfo(PassageServiceImpl.java:50)
46. at com.blog.Services.Impl.PassageServiceImpl.ListPublicAllowedPassageByUserinfo(PassageServiceImpl.java:57)
47. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
48. at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
49. at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
50. at java.lang.reflect.Method.invoke(Unknown Source)
51. at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
52. at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
53. at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
54. at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
55. at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
56. at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
57. at $Proxy2.ListPublicAllowedPassageByUserinfo(Unknown Source)
58. at com.blog.Actiion.BlogAction.Blog(BlogAction.java:103)
59. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
60. at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
61. at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
62. at java.lang.reflect.Method.invoke(Unknown Source)
63. at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:404)
64. at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:267)
65. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:229)
66. at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:221)
67. at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
68. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
69. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
70. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
71. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
72. at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:150)
73. at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:48)
74. at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
75. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
76. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
77. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
78. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
79. at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:123)
80. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
81. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
82. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
83. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
84. at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:167)
85. at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
86. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
87. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
88. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
89. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
90. at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:105)
91. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
92. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
93. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
94. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
95. at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:83)
96. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
97. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
98. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
99. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
100. at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:207)
101. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
102. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
103. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
104. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
105. at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:74)
106. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
107. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
108. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
109. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
110. at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:127)
111. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
112. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
113. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
114. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
115. at org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:107)
116. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
117. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
118. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
119. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
120. at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:206)
121. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
122. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
123. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
124. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
125. at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:115)
126. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
127. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
128. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
129. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
130. at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:143)
131. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
132. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
133. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
134. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
135. at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:121)
136. at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
137. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
138. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
139. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
140. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
141. at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:170)
142. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
143. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
144. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
145. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
146. at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:123)
147. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
148. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
149. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
150. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
151. at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
152. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
153. at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
154. at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
155. at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
156. at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:50)
157. at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:504)
158. at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:419)
159. at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
160. at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
161. at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
162. at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
163. at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
164. at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
165. at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
166. at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:291)
167. at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
168. at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
169. at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
170. at java.lang.Thread.run(Unknown Source)