Using Probe with Tomcat Step 60

It is a good idea for you to be familiar with a profiler or static analysis tool. Profilers can give you information about memory leaks and other needed information to help you improve your code. One tool that you can try is the Lamda Probe which is a tool to analyze your Tomcat applications.

http://www.lambdaprobe.org/d/index.htm
You can download it from the above site and select the Download Lambda Probe on the left hand side. The version I downloaded is probe.1.7b.zip.

When you unzip it, you will notice that the file is called probe.war. Deploy that war file to your webapps folder of your tomcat instance.

You need to add some users to tomcat for this application. Open your tomcat-users.xml file under your tomcat conf folder.

Add these roles to this xml file:
<role rolename="probeuser"/><role rolename="poweruser"/><
role rolename="poweruserplus"/>

and add these users:
<user username="poweruser" password="poweruser" roles="poweruser"/>
<user username="poweruserplus" password="poweruserplus" roles="poweruserplus"/>
<user username="probeuser" password="probeuser" roles="probeuser"/>
<user username="probemanager" password="probemanager" roles="manager"/>

Now you should start your tomcat and visit this URL:
http://localhost:8080/probe/

Login as one of the users you added. I logged in as probeuser with the password as probeuser.
This application will give you data on the memory usage of your tomcat instance.

There are many other static analysis tools that can help you discover memory leaks and other issues you might have in your application.
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