Unexpected java.lang.IllegalArgumentException when calling a jar file

Question

I am trying to run the Jenkins war file with some additional java options as suggested here, but I get the exception:

Exception in thread "main" java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at Main._main(Main.java:288)
        at Main.main(Main.java:98)
Caused by: java.lang.IllegalArgumentException: Multiple command line argument specified: -XX:+CMSClassUnloadingEnabled
        at winstone.cmdline.CmdLineParser.parse(CmdLineParser.java:68)
        at winstone.Launcher.getArgsFromCommandLine(Launcher.java:391)
        at winstone.Launcher.main(Launcher.java:359)
        ... 6 more

Answer 1

My problem, pointed out by my co-worker, is that I was specifying the jar file before the options:

nohup nice /usr/bin/java -DJENKINS_HOME=/opt/jenkins/CI -Dorg.apache.commons.jelly.tags.fmt.timeZone=America/New_York -Djava.awt.headless=true -jar jenkins.war -XX:MaxPermSize=2048m -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled

It should have been:

nohup nice /usr/bin/java -DJENKINS_HOME=/opt/jenkins/CI -Dorg.apache.commons.jelly.tags.fmt.timeZone=America/New_York -Djava.awt.headless=true -XX:MaxPermSize=2048m -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled -jar jenkins.war

Simple mistake, but (aside from the documentation, which I unfortunately glossed over), I haven't seen anywhere that XX options must precede the jar file on the java command line.