java.lang.NoClassDefFoundError: Could not initialize class hudson.util.ProcessTree$UnixReflection
I am having this problem when trying to build my project with Jenkins: java.lang.NoClassDefFoundError: Could not initialize class hudson.util.ProcessTree$UnixReflection. java.lang.NoClassDefFoundError: Could not initialize class hudson.util.ProcessTree$UnixReflection at hudson.util.ProcessTree$Unix.get(ProcessTree.java:506) at hudson.util.ProcessTree.killAll(ProcessTree.java:144) at hudson.Proc$LocalProc.destroy(Proc.java:380) at hudson.Proc$LocalProc.join(Proc.java:353) at hudson.tasks.CommandInterpreter.join(CommandInterpreter.java:155) at hudson.tasks.CommandInterpreter.perform