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CRaSH for Mule, an Introduction

Why is it better than JMX?

This blog is the formal introduction to the CRaSH console for Mule on which I've been working for the past month or so. I've decided to interview myself about it because, hey, if I don't do it, who will?

What is CRaSH for Mule?
It is a shell that is running embedded in Mule and that gives command-line access to a variety of Mule internal moving parts. It's built thanks to the excellent CRaSH project, a toolkit built by Julien Viet and sponsored by eXo Platform, which allows the easy creation of embedded shells.

What can we do with it?
Well, it's easy to find it out. Let's connect to CRaSH for Mule and ask for help:

As you can see the range of actions include gathering information, like statistics and names, but also performing actions, like restarting a connector or even stopping the broker.

Why is it better than JMX?
Behind the scene CRaSH for Mule relies on JMX so anything you can do with it could be done with direct JMX interactions (like with JConsole or jmxterm). This said CRaSH for Mule has many advantages over raw JMX, including:

  • Adds Mule semantics to JMX. You do not need to fiddle with lengthy object names do achieve what you want: CRaSH for Mule builds the right object names based on your actions.
  • Provides auto-completion, this for application names and commands.
  • Supports connectivity over telnet and ssh. No need for baroque JMX RMI connection strings.
  • All the other CRaSH commands are available. The default set of commands is very rich: to name a few, it comes complete with commands for dealing with the system, the JVM, JDBC and JNDI.

How does it compare to MMC?
Well, it doesn't! The Mule Management Console is way more capable and feature-laden, and comes bundled with the Enterprise Edition of Mule.

CRaSH for Mule focuses on admin-oriented command-line friendly interactions with Mule. And it is fully open sourced.

How do I install it?
Navigate to CRaSH's homepage and locate the Mule distribution download link. You'll get an archive that contains different files, including crash-mule-app.zip that you need to drop in your Mule broker apps directory. This application contains a readme file that explains how to configure it, should the default configuration not satisfy you. You can also read it online.

CRaSH for Mule 1.2.0-cr6-SNAPSHOT has been tested on Mule CE 3.3.1 and EE 3.3.1.

Got into trouble?
Report issues or open feature requests directly to CRaSH's JIRA.

Read the original blog entry...

More Stories By David Dossot

David Dossot has worked as a software engineer and architect for more than 14 years. He is a co-author of Mule in Action and is the project despot of the JCR Transport and a member of the Mule Community Committee. He is the project lead of NxBRE, an open source business rules engine for the .NET platform (selected for O'Reilly's Windows Developer Power Tools). He is also a judge for the Jolt Product Excellence Awards and has written several articles for SD Magazine. He holds a Production Systems Engineering Diploma from ESSTIN.

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