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    <p>Put example-library.jar somewhere in your file system and pass that location to the code that runs JavaCompiler (the -classpath option). If you use an exploded WAR file to deploy, you can of course point it to the physical location within the WEB-INF/lib folder. The point is that you only need one configurable parameter in your webapp to do this, which can be a properties file entry, -D system property, database row or something else entirely.</p> <p>Sample code (tested in Tomcat 7 and OpenJDK 1.7 on Fedora 18 x64):</p> <pre><code>private File compile(File javaFile, String classpath) throws IOException { JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null); Iterable&lt;? extends JavaFileObject&gt; compilationUnit = fileManager.getJavaFileObjects(javaFile); List&lt;String&gt; options = classpath != null ? Arrays.asList("-classpath", classpath) : null; StringWriter output = new StringWriter(); try { boolean successful = compiler.getTask(output, fileManager, null, options, null, compilationUnit).call(); if (!successful) { throw new CompilationException("Failed to compile: " + javaFile, output.toString()); } return firstClassFileFrom(javaFile.getParentFile()); } finally { fileManager.close(); } } private File firstClassFileFrom(File directory) { return directory.listFiles(new FilenameFilter() { @Override public boolean accept(File dir, String name) { return name.endsWith(".class"); } })[0]; } </code></pre> <p>See <a href="https://github.com/jpalomaki/compiler" rel="nofollow">https://github.com/jpalomaki/compiler</a> for a runnable sample webapp.</p>
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    1. POUse webapp classpath using JavaCompiler in Tomcat within Eclipse with Maven
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    1. USJukka
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    1. CODid you read my question carefully, as well as the links I provided? How is your answer different than the approaches I have already tried, which moreover provided actual code?
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      1. USGarret Wilson
    2. COYes, I did read your question. You provided a link to a stackoverflow answer that showed you how you can set the JavaCompiler -classpath, and then you asked "how you can simply provide the classpath of currently executing code to JavaCompiler". Now just create the classpath string (e.g. /path/to/webapp/WEB-INF/lib/example-library.jar) and pass it on to javaCompiler. No need for your component to know anything about Servlet Contexts or classloader URLs.
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      1. USJukka
    3. COI had already tried that, and it doesn't work. I've updated the question to include an example of what I've tried. Maybe you can point out what I'm doing incorrectly.
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      1. USGarret Wilson
 

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