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    <p>The reason this doesn't work is that the two <code>exec()</code> invocations start two different shells; the one you set the path in isn't the one you check it in.</p> <p>It's difficult to change the permanent, systemwide path setting. But you can change the path for the duration of the invocation of one or more programs that you need it for.</p> <p>Specifically, the thing to do is to write yourself a batch file (<code>.CMD</code> or <code>.BAT</code>, as you please), set the <code>PATH</code> near the beginning, follow that with whatever DOS/Windows commands you'd like executed with that path, and then <code>exec()</code> that script file.</p> <hr> <p>Updating the PATH for the current <em>Java</em> process seems pretty pointless. Java, once running, doesn't care about the path. Or are you running some library code that does?</p> <p>If you are running DOS/Windows commands from Java using <code>exec()</code>, the above trick will work.</p> <hr> <p><strong>Update:</strong> OK, you have library code that for reasons of its own wants the PATH set just so, and you want to give it what it wants.</p> <p>What I would consider here is to fire up a new JVM. You can use <code>exec(cmd, envp)</code> to start up a new Java application ("yourself," in a pinch) with a custom set of environment variables in <code>envp</code>. Just copy the ones that are already there and manipulate the contents of <code>PATH</code>, if any.</p> <p>The standard way to start up a new Java app is to create a new <code>ClassLoader</code>, and there are various descriptions on how to accomplish that. But I'm not sure you can use that procedure to come up with a new environment - so <code>exec</code>-ing the JVM may not only be simpler, but possibly the only way.</p>
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    1. USCarl Smotricz
    1. USCarl Smotricz
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    1. COHi, yes, I'm running some library code. I edited my question.
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    2. COUpdated my suggestion, hopefully you'll find the update helpful.
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    3. COThanks for your answer, but launching a new JVM isn't an option as I'm running inside an applet (With a signed JAR). I updated my question with another try with JNI.
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