java.lang.reflect.Method.invoke(Unknown Source)

.alibaba.fastjson.serializer.MapSerializer.write(MapSerializer.java:188)

.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)

sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)

org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)

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.alibaba.fastjson.serializer.JSONSerializer.write(JSONSerializer.java:369)

.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)

HTTP Status 500 - 139

.alibaba.fastjson.serializer.StringCodec.write(StringCodec.java:49)

org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)