run class file as separate process from java code

Question

public static void main(String args[]) throws IOException
{
    Process p = Runtime.getRuntime().exec("java E:/workspace/JNIProgram/src/JNIProgram.class");
}

so I have this code and am trying to run the JNIProgram.class file however the program gets terminated instantly without doing its job (which is to create a new txt file and write to it)

So what am I doing wrong

Also check the tips in the [runtime.exec info. page](http://stackoverflow.com/tags/runtime.exec/info). — Andrew Thompson, Jul 23 '12 at 14:13

score 6 · Accepted Answer · answered Jul 23 '12 at 14:06

The java command expects a Java class name, not a filename.

So the command java E:/workspace/JNIProgram/src/JNIProgram.class is wrong. If you try this manually from a command prompt window you'll get an error message.

The command should be something like this:

java -cp E:\workspace\JNIProgram\src JNIProgram

Note: What's after the -cp option is the classpath, and after that the fully-qualified class name (which is just JNIProgram, if the class is not in a package).

First make sure that you can run the command manually from the command line before you make it work from another Java program.

run class file as separate process from java code

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