java ee - Keep getting the OgnlException: source is null for getProperty(null, "0") Warning -


ok. using below .jsp , java code access notmessagefieldlist. works fine; however, keep getting ognlexception: source null getproperty(null, "0") warning when leave page. seems struts 2 trying null values , triggers warning. there way rid of without adjusting tomcat settings?

jsp:

        <s:iterator var="counter" begin="0" end="3">         <tr>             <th style="font-size: 120%; font-weight: 900; color: red;">x</th>             <td style="font-size: 80%;">new</td>         </tr>         <tr>             <td><b>field name:</b>&nbsp;             </td>             <td style="float: left">                 <s:textfield                         name="notmessagefieldlist[%{counter}].tag"                         size="47">                 </s:textfield>             </td>         </tr>         <tr>             <td><b>description:</b>&nbsp;             </td>             <td style="float: left">                 <s:textfield                         name="notmessagefieldlist[%{counter}].description"                         size="47">                 </s:textfield>             </td>         </tr>         <tr>             <td><b>data type:</b>&nbsp;             </td>             <td style="float: left">                 <s:select                         list="validdatatypes"                         name="notmessagefieldlist[%{counter}].datatype"                         key="datatype.required"/>             </td>         </tr>         </s:iterator>

java action:

private list<notificationmessagefield> notmessagefieldlist = new arraylist<>(4);  public list<notificationmessagefield> getnotmessagefieldlist() {         return notmessagefieldlist;     }  public void setnotmessagefieldlist(@nullable final list<notificationmessagefield> notmessagefieldlist) {     if (collectionutils.isnotemptylist(notmessagefieldlist)) {         this.notmessagefieldlist.clear();         this.notmessagefieldlist = new arraylist<>(notmessagefieldlist);     } else {         this.notmessagefieldlist = new arraylist<>(5);     } }

java pojo (assume regular set up, getters/setters):

public notificationmessagefield(final string tag, final string description, final string datatype) {     this.tag = tag;     this.description = description;     this.datatype = datatype; }

add value attribute textfields. preset textfields initial value , once value preset won't evaluated name. 

<s:textfield name="notmessagefieldlist[%{counter}].tag" size="47" value="">

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