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call java (main) program from JSP

 
Greenhorn
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I have a java program, which is supposed to run as a batch. Would like to know how to invoke this batch program from the JSP page.
Thanks in advance.
 
Ranch Hand
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You use the java.lang.Runtime.getRuntime().exec() call to execute a process on the server. Keep in mind that the JSP simply becomes a servlet that executes on the <b>server</b> not the client. I have had good luck executing a shell script on Unix systems or batch (.bat or .cmd) files in Windows.
However, if you are executing Java, first look into using the exposed Java API (if there is one) of whatever you are doing and running in the same VM with the following warning
<b>Do not call the main method of some Java class from another Java class as often the main method terminates by calling System.exit() which will kill the JVM.</b>
 
Don't get me started about those stupid light bulbs.
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