Warn:Parameters: Invalid chunk ignored

[red phoenix]

I have a jsp page,and there is a button in it,when I click this button,it
will call Javascript,and redirect another page,my code is follows:
...
functioin test(){
  document.forms[0].action="a.do";
  document.forms[0].submit();
}
...
<s:form>
 <table>
     <td><a href="javascript:test()" >Test</a></td>
    </tr>
   </table>
</s:form>
...

When I run above page,it can redirect the page successly,but Tomcat6 say
"Warn:Parameters: Invalid chunk ignored",why raise above warning
information,why to correct my code to get rid of this warning?

Thanks!