Calling Java .jar Program from Perl using System()

Question

The title pretty much says it all, I am trying to get a java program (.jar file) to run from a Perl program. I read another post on Stackoverflow saying this syntax is correct:

system("java filename.jar");

However this is giving me the following error. I'm not sure if the problem is that it shows the filename as "filename/jar" instead of "filename.jar"

Exception in thread "main" java.lang.NoClassDefFoundError: filename/jar
Caused by: java.lang.ClassNotFoundException: filename.jar
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

Answer 1

You have to use the -jar option to launch a jar.

java [ options ] -jar file.jar [ argument ... ]

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Resources :

• sun.com - java

Answer 2

You need to call it as java -jar filename.jar.

If you leave out the -jar, then java thinks you're trying to run a class named filename.jar, which it tries to load from the filename/jar file. Since you don't have that file, java throws the error that you see.