camel-errorhandler

camel-errorhandler: demonstrates how to handle exceptions in Camel.

Author: Fuse Team
Level: Beginner
Technologies: Fuse, OSGi, Camel
Summary: This quickstart demonstrates how to handle exceptions that can occur while routing messages with Camel. Target Product: Fuse
Source: https://github.com/jboss-fuse/quickstarts

What is it?

This quickstart demonstrates how to handle exceptions that occur while routing messages with Camel.

This quickstart show you how to add a default error handler to your Camel context for all uncaught exceptions. Additionally, it will show you how to add exception handling routines for dealing with specific exception types.

In studying this quick start you will learn:

• how to define a Camel route using the Blueprint XML syntax
• how to build and deploy an OSGi bundle in JBoss Fuse
• how to define a default error handler to your Camel context
• how to define exception-specific error handling routines

For more information see:

• http://www.enterpriseintegrationpatterns.com/DeadLetterChannel.html for the Dead Letter Channel EIP
• https://access.redhat.com/site/documentation/JBoss_Fuse/ for more information about using JBoss Fuse

System requirements

Before building and running this quick start you need:

• Maven 3.1.1 or higher
• JDK 1.7 or 1.8
• JBoss Fuse 6

Build and Deploy the Quickstart

1. Change your working directory to camel-errorhandler directory. *. Run mvn clean install to build the quickstart. *. Start JBoss Fuse 6 by running bin/fuse (on Linux) or bin\fuse.bat (on Windows). *. In the JBoss Fuse console, enter the following command:

    osgi:install -s mvn:org.jboss.quickstarts.fuse/beginner-camel-errorhandler/6.3.0.redhat-187
   

*. Fuse should give you an id when the bundle is deployed *. You can check that everything is ok by issuing the command:

    osgi:list

your bundle should be present at the end of the list

Use the bundle

To use the application be sure to have deployed the quickstart in Fuse as described above. Successful deployment will create and start a Camel route in Fuse.

1. As soon as the Camel route has been started, you will see a directory work/errors/input in your JBoss Fuse installation.
2. Copy the file you find in this quick start's src/main/fabric8/data directory to the newly created work/errors/input directory.
3. Wait a few moments and you will find the files in directories under work/errors:

• order4.xml will always end up in the work/errors/validation directory
• other files will end up in work/errors/done or work/errors/deadletter depending on the runtime exceptions that occur

5. Use log:display to check out the business logging - the exact output may look differently because the 'unexpected runtime exception...' happen randomly

    Processing order4.xml
    Order validation failure: order date 2012-03-04 should not be a Sunday
    Validation failed for order4.xml - moving the file to work/errors/validation
    Processing order5.xml
    An unexcepted runtime exception occurred while processing order5.xml
    Done processing order5.xml
    ...
   

Undeploy the Bundle

To stop and undeploy the bundle in Fuse:

1. Enter osgi:list command to retrieve your bundle id

2. To stop and uninstall the bundle enter

    osgi:uninstall <id>