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Performance and Security in Tomcat's Debug Mode in production

 
Alex O. Sul
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Hello!

Recently i was looking for a tool to make easily the deploy of bug fixes in production, and i have found the ClassGhost utility (http://classghost.sourceforge.net/). This tool injects classes in the production JVM. It looks pretty good, and does the work very well.

But, to do this job, the ClassGhost needs some parameters in the JVM. These parameters, in Tomcat, are related with the Debug mode (as you can see in this http://classghost.sourceforge.net/how.html and this http://wiki.apache.org/tomcat/FAQ/Developing links).

My question is: what do you think about enable debug mode of Tomcat in production? Did you do something like this? Please, i want to listen your considerations.

Thanks!
 
Tim Holloway
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Be careful. The JVM debugger cannot be switched on and off on the fly, which means that it's available at all times, and it's not protected by any sort of security system. If an intruder can gain debug access, they can browse and even alter sensitive memory, gain insight into possible application logic flaws, and generally wreak havoc.
 
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