Need your expertise to diagnose the problem.
I have a java class ListThread.java that extends
Action. This java class simply calls a couple of
helper classes to access my database. In the end of
the ListThread.java, it is a standard statement:
return ( mapping.findForward( "success" ) );
I have not yet prepared a JSP to be displayed in the
browser after ListThread.java completes its tasks;
therefore, upon completion, I temporarily wants the
application to be forwarded to my welcome page. (My
welcome page works fine.)
Because the ListThread.java does not really submit a
form, I simply put name="articleForm" in the
struts-config.xml file. I have substituted with other
forms for testing purpose. Nonetheless, I always got
Status 500 error:
----- Root Cause -----
java.lang.NullPointerException
at
org.apache.struts.scaffold.ParameterAction.findSuccess(Unknown
Source)
at
org.apache.struts.scaffold.BaseAction.execute(Unknown
Source)
at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
.............
.............
My struts-config.xml looks like:
<action
roles="administrator,editor,contributor"
path="/message/ListThreads"
type="org.apache.artimus.message.ListThread"
name="articleForm"
scope="request"
validate="false">
<forward
name="success"
path="/signin/Welcome.jsp"/>
</action>
And here is my ListThread.java:
import LOTS OF PACKAGES AND CLASSES;
public final class ListThread extends Action
{
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
String memberName = request.getRemoteUser();
// for sort and order stuff
String sort = request.getParameter( "sort" );
String order = request.getParameter( "order" );
if ( sort.length() == 0 ) sort =
"ThreadLastPostDate";
if ( order.length()== 0 ) order = "DESC";
int offset = 0;
int rows =
MessageInboxConfig.ROWS_IN_THREADS;
offset = Integer.parseInt( request.getParameter(
"offset" ) );
rows = Integer.parseInt( request.getParameter(
"rows" ) );
ListThreadHandler lthandler = new
ListThreadHandler();
ListPostHandler lphandler = new
ListPostHandler();
int totalThreads =
lthandler.getNumberOfThreads_forReceiver( memberName
);
if ( offset > totalThreads )
{
throw new BadInputException( "The offset is
not allowed to be greater than total rows." );
}
Collection beans =
lthandler.getThreads_forReceiver_withSortSupport_limit(
memberName, offset, rows, sort, order );
SiteUtil.prepareNavigate( request, offset,
beans.size(), totalThreads,
MessageInboxConfig.ROWS_IN_THREADS );
int totalPosts =
lphandler.getNumberOfPosts_forReceiver( memberName );
request.setAttribute( "ThreadBeans", beans );
request.setAttribute( "TotalThreads", new
Integer( totalThreads ) );
request.setAttribute( "TotalPosts", new Integer(
totalPosts ) );
return ( mapping.findForward( "success" ) );
}
}
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