無法通過修飾符訪問類org.springframework.aop.TruePointcut的成員public

Question

我正在開發一個使用Struts和Struts JSON插件的Spring應用程序。當我運行應用程序它提供了以下錯誤（在Firebug）：

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.springframework.aop.TruePointcut with modifiers public 

這是完整的堆棧跟蹤：

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.springframework.aop.TruePointcut with modifiers "public" 
    org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:238) 
    org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:171) 
    org.apache.struts2.json.JSONWriter.process(JSONWriter.java:161) 
    org.apache.struts2.json.JSONWriter.value(JSONWriter.java:127) 
    org.apache.struts2.json.JSONWriter.write(JSONWriter.java:95) 
    org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:116) 
    org.apache.struts2.json.JSONResult.createJSONString(JSONResult.java:196) 
    org.apache.struts2.json.JSONResult.execute(JSONResult.java:170) 
    com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:374) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:278) 
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265) 
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:192) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) 
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:511) 
    org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:432) 

根源：

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.springframework.aop.TruePointcut with modifiers "public" 
    org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:238) 
    org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:171) 
    org.apache.struts2.json.JSONWriter.process(JSONWriter.java:161) 
    org.apache.struts2.json.JSONWriter.value(JSONWriter.java:127) 
    org.apache.struts2.json.JSONWriter.add(JSONWriter.java:363) 
    org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:223) 
    org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:171) 
    org.apache.struts2.json.JSONWriter.process(JSONWriter.java:161) 
    org.apache.struts2.json.JSONWriter.value(JSONWriter.java:127) 
    org.apache.struts2.json.JSONWriter.write(JSONWriter.java:95) 
    org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:116) 
    org.apache.struts2.json.JSONResult.createJSONString(JSONResult.java:196) 
    org.apache.struts2.json.JSONResult.execute(JSONResult.java:170) 
    com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:374) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:278) 
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265) 
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249 

Answer 1

這個類是不公開的本身。它受到封裝保護（請參閱here）。您必須先訪問setAccessible(true)才能訪問其成員，就像訪問私有或受保護成員時一樣。

編輯。 不幸的是，你還沒有提供完整的堆棧跟蹤。如果這個異常是你的活動的結果（我的意思是你嘗試訪問Spring類的成員），解決方案在上面。但是如果這是由於框架碰撞而發生的，請發送更多細節。可能你的Struts和Spring版本不兼容，或者需要一些額外的配置。