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POUsing javax.tools.ToolProvider from a custom classloader?
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copied!<p>It seems to be impossible to use <code>javax.tools.ToolProvider</code> from a custom classloader as required by Ant or Webstart: <a href="http://bugs.sun.com/view_bug.do?bug_id=6548428" rel="noreferrer">http://bugs.sun.com/view_bug.do?bug_id=6548428</a></p> <p><code>javax.tools.ToolProvider.getSystemJavaCompiler()</code> loads <code>javax.tools.JavaCompiler</code> into a URLClassLoader whose parent is the system classloader. The API does not seem to allow users to specify a parent classloader.</p> <p><strong>How can one use <code>javax.tools.JavaCompiler</code> from a custom classloader?</strong></p> <p>For example:</p> <ul> <li>Ant loads <code>MyParserTask</code></li> <li><code>MyParserTask</code> parses Java source-code</li> <li><code>MyParserTask</code> is loaded by <code>AntClassLoader</code> that delegates to the system classloader</li> <li><code>javax.tools.JavaCompiler</code> is loaded by <code>URLClassLoader</code> thast delegates to the system classloader</li> </ul> <p>At a later point, <code>MyParserTask</code> invokes:</p> <pre><code>javax.tools.CompilationTask task = compiler.getTask(...); com.sun.source.util.JavacTask javacTask = (com.sun.source.util.JavacTask) task; javacTask.parse().next().accept(visitor, unused); // parsing happens here </code></pre> <ul> <li>Seeing how the two classes reside on separate classloaders, there doesn't seem to be a way for <code>MyParserTask</code> to interact with <code>JavacTask</code> without getting <code>ClassCastException</code> errors.</li> </ul> <p>Any ideas?</p>

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