I discovered this when trying to make hudson eat my own dog food (compiling the
plugins I'm messing with)

When running a Maven 2.0.4 based build on *nix, Hudson attempts to spawn a
process using the wrong script, "maven". Maven2 comes only with one script that
can be used to launch maven, its named "mvn". The windows batch file is named
"mvn.bat".

There are m2 and m2.bat files as well, but these will fail immediately and tell
you to run mvn or mvn.bat.

One solution might be that if the "maven" or "maven.bat" files can't be found,
then "mvn" or "mvn.bat" should be used.

Console Output:

[trunk] $ maven test
FATAL: command execution failed
java.io.IOException: Cannot run program "maven" (in directory
"/whatever/hudson/jobs/FindBugsPlugin/workspace/trunk"): java.io.IOException:
error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:459)
at java.lang.Runtime.exec(Runtime.java:593)
at hudson.Proc$LocalProc.<init>(Proc.java:79)
at hudson.Launcher$LocalLauncher.launch(Launcher.java:130)
at hudson.Launcher.launch(Launcher.java:74)
at hudson.Launcher.launch(Launcher.java:70)
at hudson.Launcher.launch(Launcher.java:58)
at hudson.tasks.Maven.perform(Maven.java:94)
at hudson.model.Build$RunnerImpl.build(Build.java:251)
at hudson.model.Build$RunnerImpl.doRun(Build.java:223)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:114)
at hudson.model.Run.run(Run.java:533)
at hudson.model.Build.run(Build.java:203)
at hudson.model.Executor.run(Executor.java:61)
Caused by: java.io.IOException: java.io.IOException: error=2, No such file or
directory
at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
at java.lang.ProcessImpl.start(ProcessImpl.java:65)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:452)
... 13 more
finished: FAILURE