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copied!<p>I've not tried this myself, but from memory each clashing class needs to be in a sibling classloader and any communication between the two needs to go through a common ancestor. However, the ancestor cannot (AFAIK) "directly" reference classes from its children and must access them through the reflection API.</p> <p>Something along these lines ought to work (dry-coded) YMMV. Comments and error-spotting welcome.</p> <pre><code>class Orchestrator { URL[] otherAppClasspath = new URL[] { new URL("file:///vendor-api.jar"), new URL("file:///hibernate2.jar"), new URL("file:///code-extending-vendor-api.jar" }; URLClassLoader otherAppLoader = new URLClassLoader(otherAppClasspath); URL[] yourAppClasspath = new URL[] { new URL("file:///myapp.jar"), new URL("file:///hibernate3.jar") }; URLClassLoader yourAppLoader = new URLClassLoader(yourAppClasspath); public void start() { Method yourAppEntryPoint = yourAppLoader.findClass("com/company/Main").getMethod("start", new Class[] { Orchestrator.class } ); yourAppEntryPoint.invoke(null, new Object[] { this }); } public static void main(String[] args) { new Orchestrator().start(); } // define some abstracted API here that can be called from your app // and calls down into classes in the other app public String getSomeResultFromOtherApp(int someArgument) { Method otherAppAPI = otherAppLoader.findClass("com/company/ExtendingAPIClass").getMethod("getSomeResult", new Class[] { Integer.class }); return (String)otherAppAPI.invoke(null, new Object[] { someArgument }); } } </code></pre>

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