erializer.write(mapserializer.java:188) coba.fastjson.serializer.jsonserializer.write(jsonserializer.java:369) coba.fastjson.json.tojsonstring(json.java:418) coba.fastjson.json.tojsonstring(json.java:406) coe(action.java:68) sun.reflect.generatedessor38.invoke(unknown source) sun.reflect.delegatingpl.invoke(unknown source) java.lang.reflect.method.invoke(unknown source).opensyctioninvocation.invokeaction(defaultactioninvocation.java:452).opensyctioninvocation.invokeactiononly(defaultactioninvocation.java:291).opensyctioninvocation.invoke(defaultactioninvocation.java:254).opensymphony.xwork2.interceptor.defaultworkflowinterceptor.dointercept(defaultworkflowinterceptor.java:176).opensyethodfilterinterceptor.intercept(methodfilterinterceptor.java:98).opensyctioninvocation.invoke(defaultactioninvocation.java:248).opensytor.validationinterceptor.dointercept(validationinterceptor.java:263) org.apache.struts2.interceptor.validation.annotationvalidationinterceptor.dointercept(annotationvalidationinterceptor.java:68).opensyethodfilterinterceptor.intercept(methodfilterinterceptor.java:98).opensyctioninvocation.invoke(defaultactioninvocation.java:248).opensymphony.xwork2.interceptor.conversio