SSH+AJAX遇到的：对action进行注入后不能转为json的问题。

问题来源：

SSH与AJAX一起使用的时候，偶尔会遇到，对于某个action，老是报错没办法把某个类型转换成json，报错信息具体如下

报错代码：（代码排版有点丑陋，可以用左上角的view plain查看）

严重: Exception occurred during processing request: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)at org.apache.struts2.json.JSONWriter.write(JSONWriter.java:102)at org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:116)at org.apache.struts2.json.JSONResult.createJSONString(JSONResult.java:202)at org.apache.struts2.json.JSONResult.execute(JSONResult.java:176)at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:371)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:275)at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:249)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:249)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:562)at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:152)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)Caused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)... 77 moreCaused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)... 82 moreCaused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)... 87 moreCaused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)at org.apache.struts2.json.JSONWriter.map(JSONWriter.java:436)at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:154)at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)... 92 moreCaused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)... 100 moreCaused by: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)... 105 moreCaused by: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"at sun.reflect.Reflection.ensureMemberAccess(Unknown Source)at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(Unknown Source)at java.lang.reflect.AccessibleObject.checkAccess(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:226)... 110 more

解决方法：

把相关有依赖注入的变量的get方法去掉就可以了，或者也可以在相应的get方法上添加标签：

@JSON(serialize=false)