Tip #15: How To Debug Unit Tests During Maven Builds
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by ByronNevins
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Published on Thu, 12 Apr 2012 18:36:21 -0500
Indexed on
2012/04/13
5:37 UTC
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It must be really really hard to step through unit tests in a debugger during a maven build. Right?
Wrong!
Here is how i do it:
1) Set up these environmental variables:
MAVEN_OPTS=-Xmx1024m -Xms256m -XX:MaxPermSize=512m
MAVEN_OPTS_DEBUG=-Xmx1024m -Xms256m -XX:MaxPermSize=512m -Xdebug (no line break here!!) -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=9999
MAVEN_OPTS_REG=-Xmx1024m -Xms256m -XX:MaxPermSize=512m
2) create 2 scripts or aliases like so:
maveny.bat:
set MAVEN_OPTS=%MAVEN_OPTS_DEBUG%
mavenn.bat:
set MAVEN_OPTS=%MAVEN_OPTS_REG%
To debug do this:
- run maveny.bat
- run mvn install
- attach your debugger to port 9999 (set breakpoints of course)
- When maven gets to the unit test phase it will hit your breakpoint and wait for you.
When done debugging simply run mavenn.bat
Notes
-
- If you set the suspend=n flag then you can just leave it -- but only one maven build can run at a time because of the debug port conflict.
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