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I have child-first UrlClassLoader to load jar file dynamically. Then I do a reflection to invoke a method within loaded jar file. Once it is finished, I prefer to unload the classloader. Then I try to do some stress test code to make sure my code run smoothly. Basically, what I try to do is load and unload jar within looping statement. Here is my code: for (int i = 0; i < 1000; i++) { //Just to show the progress System.out.println("LOAD NUMBER : " + i); ChildFirstURLClassLoader classLoader = null; try { File file = new File("C:\\library.jar"); String classToLoad = "com.test.MyClass"; URL jarUrl = new URL("file:" + file.getAbsolutePath()); classLoader = new ChildFirstURLClassLoader(new URL[] {jarUrl}, null); Class<?> loadedClass = classLoader.loadClass(classToLoad); Method method = loadedClass.getDeclaredMethod("execute", new Class[] {}); ClassLoader currCl= Thread.currentThread().getContextClassLoader(); Thread.currentThread().setContextClassLoader(classLoader); method.invoke(null); Thread.currentThread().setContextClassLoader(currCl); method = null; loadedClass = null; } finally { if (classLoader != null) { classLoader.close(); classLoader = null; } } } When I'm running this code under JDK1.6, without classLoader.close(); statement, that code runs perfectly. But when I turn into JDK1.7, sometimes I get java.lang.OutOfMemoryError: PermGen space error. Unfortunately it occurs in inconsistent manner.

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