Running java programs in one runtime instance

Question

I am wondering if such thing is possible: I have a java program that takes arguments and gives output to the console. What i need is to run it multiple times - it (jar file) runs smoothly but the overhead for starting and stoping java runtime is way to big. Is there a way to instantiate java runtime (or vm, I'm not sure how to call it) once, and then somehow connect to that runtime several times and execute the jar?

I hope that despite my serious ignorance of java terminology, someone will be able to answer my question :D.

andersoj · Accepted Answer · 2009-05-12 22:11:45Z

11

It should be straightforward to write a wrapper class that calls into the JAR's Main-class, and calls AppClass.main() with the appropriate arguments repetitively:

// wraps class MyWrapped
class MyWrapper {

public static void main(String[] args) {
   for (each set of command-line args) {
       MyWrapped.main(arguments);
   }
}

Remember, a Java app's main() method is nothing special, it's just a static method you can call yourself. It could even be invoked by multiple threads simultaneously, if properly designed.

edited May 12, 2009 at 22:11

answered May 12, 2009 at 20:25

andersoj

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Mike Pone · Accepted Answer · 2009-05-12 20:26:02Z

0

Might be a better to design to create a main wrapper that executes your code multiple times. Think about it in those terms. Instantiate a class file and call a method as many times as you need.

answered May 12, 2009 at 20:26

Mike Pone

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Ben Hardy · Accepted Answer · 2009-05-12 20:45:07Z

0

Any reason you can't just have this run in loop?

answered May 12, 2009 at 20:45

Ben Hardy

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Thorbjørn Ravn Andersen · Accepted Answer · 2009-05-13 16:53:00Z

0

Please note that the obvious approach listed does NOT reload classes between instantations. If you modify static fields the fields do NOT get reinitialized!

If that may be a problem, consider rewriting to deal with this. Another approach may be looking into a OSGi container based solution, as they do not allow separate segments to see one another, so each invocation have classes loaded on its own.

answered May 13, 2009 at 16:53

Thorbjørn Ravn Andersen

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