error in running a jar using java code

Question

I have a java swing application to extract text from pdf. It works fine when i run using command prompt(java -jar xyz.jar) or double click and run the jar but it gets stuck when I run using java code

Process asm = Runtime.getRuntime().exec("java -jar xyz.jar");
asm.waitFor();

or using process builder. is it because of the exceptions in my application? I'm not sure.

You probably need another thread to consume the program's output streams, otherwise this code dead-locks. — Thilo
– Thilo, Commented Jun 18, 2012 at 9:45

Denys Séguret · Accepted Answer · 2012-06-18 09:43:07Z

2

You probably aren't in the proper directory.

Use the directory() method of ProcessBuilder so that the external process is run in the correct place so that the jar can be found.

ProcessBuilder processBuilder = new ProcessBuilder("java -jar xyz.jar");
processBuilder.redirectErrorStream(true);
processBuilder.directory(  complete this );
Process process = processBuilder.start();
String output = readOutput(process);
try {
    if (process.waitFor() != 0) {
        throw new IOException("command exited in error: " + process.exitValue() + "\n" + output);
    }
} catch (InterruptedException e) {
    e.printStackTrace();
}

If this doesn't solve your problem, print the output streams (including the error one) to see what happens.

edited Jun 18, 2012 at 9:43

answered Jun 18, 2012 at 9:37

Denys Séguret

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2 Comments

Raj Over a year ago

actually jar is running,but it is getting stuck in middle

Denys Séguret Over a year ago

I suppose you can print the state/exceptions on the console and read the console using processbuilder outputs ? What does that show ?

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