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 more
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: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$EntityInstrumentationMetadataImpl with modifiers "public"
	at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)
	at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)
	at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)
	at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)
	at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)
	at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)
	... 82 more
Caused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$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 more
Caused 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$EntityInstrumentationMetadataImpl with modifiers "public"
	at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)
	at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)
	at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)
	at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)
	at org.apache.struts2.json.JSONWriter.map(JSONWriter.java:436)
	at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:154)
	at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)
	at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)
	at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)
	... 92 more
Caused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$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 more
Caused 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$EntityInstrumentationMetadataImpl with modifiers "public"
	at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)
	at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)
	at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)
	at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)
	at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)
	at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)
	... 105 more
Caused by: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.bytecode.internal.javassist.BytecodeProviderImpl$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

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)

（编辑：李大同）

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