Exception Handling

["Shaikh, Shahid" <ss...@navicure.com>]

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();
    }


}


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