OSGi - Adding bundle's classes to specific classloader

Question

I have bundle A.jar installed in OSGi and I can get this bundle using BundleContext

Bundle bundleA = context.getBundle()

And a specific classloader B

How can I adding all class from bundleA to my classloader B

Answer 1

You can not do this at runtime. You can add a Require-Bundle header to bundle B. Then the classloader of bundle B will know all classes of bundle A. This is not really recommended though.

So I would rather ask you what do you want to achieve with this? Perhaps there is another solution to your problem.

Answer 2

Let me assume you are writing your own class loader and want to use Bundle A's class loader as its parent. You can get the class loader for Bundle A as follows:

ClassLoader clA = bundleA.adapt(BundleWiring.class).getClassLoader();

You can then use clA as the parent of a new ClassLoader instance for loading your classes which depend upon classes from A.