JSON error using Struts2

Question

When I start my jsp I use a javascript function to charge in session a user. The javascript function use JSON with a struts2 action. This is the code:

JSP:

<body>
   <script>usarAJAXCargarCookie();</script>
   ...
</body>

Javascript:

function usarAJAXCargarCookie() {
   var userCookie = getCookie('userCookieSL');
   $.getJSON('ajaxCookie', {
      userCookie: userCookie
   }, function (jsonResponse) {
   });
}

struts.xml

<action name="ajaxCookie" class="Acciones.HomeFavoritos" method="ajaxCookie">
   <result type="json">
      <param name="excludeNullProperties">true</param>
      <param name="noCache">true</param>
   </result>
</action>

HomeFavoritos.java

@SkipValidation
public String ajaxCookie() throws Exception{        
    if(sesion==null){
        sesion=ActionContext.getContext().getSession();
    }
    if(sesion.get("usuarioLogueado") == null || sesion.get("usuarioLogueado").equals("")){
        cargarUsuarioNoLogueado(sesion, userCookie);
    } else {
        cargarUsuarioLogueado(sesion);
    }
    return SUCCESS;
}

And I receive this error:

Grave:   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: 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: 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: 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.reflect.InvocationTargetException
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: 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: 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: 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.reflect.InvocationTargetException
    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:197)
    at org.apache.struts2.json.JSONResult.execute(JSONResult.java:171)
    at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:371)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:275)
    at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

This is unclear what are you trying to return as json response. — Roman C, May 21 '17 at 06:28

score 0 · Answer 1 · answered May 23 '17 at 07:51

InvocationTargetException is just a wrap around the real exception, that you're not showing us.

It will probably be a serialization exception, so consider using a root object as described here, instead of serializing the whole action.

Also try using english names in the code, and please, NEVER write package names with something different from lowercase (Acciones.HomeFavoritos...)

JSON error using Struts2

1 Answers1