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How do I start hacking Tomcat in Eclipse?
Briefly:
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$ git clone https://github.com/apache/tomcat.git
(or whatever branch you want: clearly, this would be better
to do directly from within Eclipse but it's easier to describe
as a command)
$ cd tomcat
$ echo "base.path=/path/to/where/tomcat/can/put/its/3rd-party/libs" > build.properties
$ ant ide-eclipse
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Then, in Eclipse, go to Preferences | Java/Build Path/Classpath Variables and set the following variables:
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ANT_HOME=path to your Ant install (where lib/ant.jar can be found)
TOMCAT_LIBS_BASE=[whatever you set base.path to above]
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The port does not need to be set to 8000, it may be any value appropriate for your system.
If you need to debug Tomcat startup or the auto-deployment of an application (where a breakpoint set in a debugger would be reached before you have time to connect with the debugger), then set the parameter suspend=y instead of suspend=n. Doing this will cause the JVM to pause execution very early in the launch process and wait until a debugger is attached before proceeding.
Whilst this is very useful in development it should not be used in production because of both security and performance implications.
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