I have a step in my build that runs a simple Groovy script file. But I get the
following exception immediately. I’m running Hudson 1.277 on Windows XP and
using groovy 1.5.7 and the libraries that come with the distribution. Groovy is
in my system path. I am not specifying any groovy or script parameters on the
Hudson config page (should I?).

This also happens when I try a simple Groovy command (println "Hello from
Groovy!").

FATAL: null
java.lang.NullPointerException
at hudson.Launcher.printCommandLine(Launcher.java:259)
at hudson.Launcher$LocalLauncher.launch(Launcher.java:305)
at hudson.Launcher.launch(Launcher.java:144)
at hudson.Launcher.launch(Launcher.java:96)
at hudson.plugins.groovy.Groovy.perform(Groovy.java:101)
at hudson.model.Build$RunnerImpl.build(Build.java:144)
at hudson.model.Build$RunnerImpl.doRun(Build.java:113)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:244)
at hudson.model.Run.run(Run.java:842)
at hudson.model.Build.run(Build.java:88)
at hudson.model.ResourceController.execute(ResourceController.java:70)
at hudson.model.Executor.run(Executor.java:90)