Exception Handling

I am trying to have the Exception page shown in Tapestry when my GridDataSource throws an exception. How do i catch a ComponentEventException nad have Tapestry redirect to the Exception page.

Your help is much appreciated!

Here is the logs.. org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) Caused by: org.apache.tapestry5.runtime.ComponentEventException [at classpath:com/navicure/ui/admin/pages/incoming/IncomingFilesPage.tml, line 67] at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1141) at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$3100(ComponentPageElementImpl.java:61) at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1062) at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1059) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74) ... 100 more Caused by: java.lang.NullPointerException at com.navicure.ui.admin.tables.FragmentDataSource.getAvailableRows(FragmentDataSource.java:91) at org.got5.tapestry5.jquery.internal.DefaultDataTableModel.getResponse(DefaultDataTableModel.java:243) at org.got5.tapestry5.jquery.internal.DefaultDataTableModel.sendResponse(DefaultDataTableModel.java:375) at org.got5.tapestry5.jquery.components.DataTable.onData(DataTable.java:128) at org.got5.tapestry5.jquery.components.DataTable.dispatchComponentEvent(DataTable.java) at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:940) at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1117) ... 104 more

Here is my object that implements ExceptionReporter

package com.navicure.ui.admin.pages;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;

import org.apache.log4j.Logger;
import org.apache.tapestry5.annotations.Log;
import org.apache.tapestry5.annotations.Property;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.services.ExceptionReporter;
import org.apache.tapestry5.services.ajax.AjaxResponseRenderer;
import org.apache.tapestry5.services.ajax.JavaScriptCallback;
import org.apache.tapestry5.services.javascript.JavaScriptSupport;

public class ExceptionReport implements ExceptionReporter {

private static Logger log = Logger.getLogger(ExceptionReport.class);

@Property
private Date filterToDate;

@Property
private Throwable exception;

@Inject
private AjaxResponseRenderer ajaxResponseRenderer;

@Property
private String messageStackTrace;

@Override
public void reportException(Throwable exception) {
this.exception = exception;
log.error(exception);
this.messageStackTrace = this.getStackMessageTrace();

private String getStackMessageTrace()

StringWriter errors = new StringWriter();
exception.printStackTrace(new PrintWriter(errors));
return errors.toString();