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For debug reasons, and curiosity, I wish to list all classes loaded to a specific class loader.
Seeing as most methods of a class loader are protected, what is the best way to accomplish what I want?
Thanks!
837
You can get all classpath roots by passing an empty String into ClassLoader#getResources() . Enumeration<URL> roots = classLoader. getResources("");
If there are classes that get generated, or delivered remotely, you will not be able to discover those classes. The normal method is instead to somewhere register the classes you need access to in a file, or reference them in a different class. Or just use convention when it comes to naming.
To know the ClassLoader that loads a class the getClassLoader() method is used. All classes are loaded based on their names and if any of these classes are not found then it returns a NoClassDefFoundError or ClassNotFoundException.
Since Java enforces the most restrictive access, we have to explicitly declare packages using the export or open module declaration to get reflective access to the classes inside the module.
Try this. It's a hackerish solution but it will do.
The field classes in any classloader (under Sun's impl since 1.0) holds hard reference to the classes defined by the loader so they won't be GC'd. You can take a benefit from via reflection.
Field f = ClassLoader.class.getDeclaredField("classes"); f.setAccessible(true); ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); Vector<Class> classes = (Vector<Class>) f.get(classLoader); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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