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call outside program

How to call a outside program.

I had a executable jar file... which upon calling executes a program
I want to execute that jar file from my struts java action class...

is it possible to call an outside jar file...

i heard shell api in java is used for calling such outside programs...

how to use that shell api.. can anyone provide me an example...

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2 Solutions
I hope this could be useful:

You can try to call main method of your starting class directly
from your code as you call any other method, if you ensure that your jar is in the classpath

You can also use Runtime.getRuntime().exec("java -jar ...") command like when starting anyothe  executable command ;
make sure that java  is in the PATH and you can provide -classpath in the argument line

In Java 6 you can also probably use Desktop command:

This is anew way though - never tried it myself, don't know if it works on all sysytems and if it is suitable
for server environment
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