JSON转换net.sf.json.JSONException: There is a cycle
at net.sf.json.util.CycleDetectionStrategy$StrictCycleDetectionStrategy.handleRepeatedReferenceAsObject(CycleDetectionStrategy.java:97) at net.sf.json.JSONObject._fromBean(JSONObject.java:859) at net.sf.json.JSONObject.fromObject(JSONObject.java:194) at net.sf.json.JSONObject._processValue(JSONObject.java:2793) at net.sf.json.JSONObject._setInternal(JSONObject.java:2817) at net.sf.json.JSONObject.setValue(JSONObject.java:1527) at net.sf.json.JSONObject._fromBean(JSONObject.java:946) at net.sf.json.JSONObject.fromObject(JSONObject.java:194) at net.sf.json.JSONArray._processValue(JSONArray.java:2562) at net.sf.json.JSONArray.processValue(JSONArray.java:2593) at net.sf.json.JSONArray.addValue(JSONArray.java:2580) at net.sf.json.JSONArray._fromCollection(JSONArray.java:1084) at net.sf.json.JSONArray.fromObject(JSONArray.java:147) at net.sf.json.JSONObject._processValue(JSONObject.java:2768) at net.sf.json.JSONObject._setInternal(JSONObject.java:2817) at net.sf.json.JSONObject.setValue(JSONObject.java:1527) at net.sf.json.JSONObject._fromBean(JSONObject.java:946) at net.sf.json.JSONObject.fromObject(JSONObject.java:194) at net.sf.json.JSONArray._processValue(JSONArray.java:2562) at net.sf.json.JSONArray.processValue(JSONArray.java:2593) at net.sf.json.JSONArray.addValue(JSONArray.java:2580) at net.sf.json.JSONArray._fromCollection(JSONArray.java:1084) at net.sf.json.JSONArray.fromObject(JSONArray.java:147) at net.sf.json.JSONArray.fromObject(JSONArray.java:129) at com.wangyu.web.action.MenuAction.execute(MenuAction.java:63) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:434) at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:273) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:235) at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:141) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:248) at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:49) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:124) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:170) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:170) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:104) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:84) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:208) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:88) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:127) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:104) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:130) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:143) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:137) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:130) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:477) at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:467) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Unknown Source)
异常原因是:
在解析bean时，出现死循环调用。
解决的办法，过滤去掉bean中引起死循环调用的属性：
List nodes = proSrv.getProcesses();
JSONObject jsonObj = new JSONObject();
JsonConfig config = new JsonConfig();
config.setJsonPropertyFilter(new PropertyFilter() {
public boolean apply(Object source, String name, Object value) {
if (name.equals("actions") || name.equals("globables")
|| name.equals("transitions")) {
return true;
} else {
return false;
}
}
});
jsonObj.put("list", JSONArray.fromObject(nodes, config));