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copied!<p>Looks like you're missing the first backslash in the path to your jar:</p> <pre><code>String command = "java " + "-jar " + "\"g:My Documents\\Dropbox\\Final Project\\Code\\Mano CPU\\Inputs\\Parser\\java-cup-11a.jar\" " + </code></pre> <p>should be</p> <pre><code>String command = "java " + "-jar " + "\"g:\\My Documents\\Dropbox\\Final Project\\Code\\Mano CPU\\Inputs\\Parser\\java-cup-11a.jar\" " + ^^ </code></pre> <hr> <p><strong>Edit:</strong> millimoose pointed out that <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html#exec%28java.lang.String%29" rel="nofollow"><code>Runtime#exec(String)</code></a> doesn't use the shell to invoke, so I checked the documentation and it apparently just uses a <a href="http://docs.oracle.com/javase/7/docs/api/java/util/StringTokenizer.html" rel="nofollow"><code>StringTokenizer</code></a> to <em>split on spaces</em>. Java is gonna split your command arguments even though they're wrapped in double-quotes. So in addition to fixing the backslash issue above, you're going to need to use the form of <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html#exec%28java.lang.String%5B%5D%29" rel="nofollow"><code>exec</code></a> which accepts a <code>String[]</code>. And you won't need to double-quote arguments containing spaces.</p> <pre><code>String[] command = new String[] { "java", "-jar", "g:\\My Documents\\Dropbox\\Final Project\\Code\\Mano CPU\\Inputs\\Parser\\java-cup-11a.jar", "-destdir", "g:\\My Documents\\Dropbox\\Final Project\\Code\\Mano CPU\\src\\Assembler", "G:\\My Documents\\Dropbox\\Final Project\\Code\\Mano CPU\\Inputs\\Assembler\\Assembler.cup", }; Process p = Runtime.getRuntime().exec(command); </code></pre>

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