Importing resources from OSGi bundle

With the import mechanism in OSGi, it is straightforward to import packages from another bundle. However, I have been unsuccessful in importing resources that exist in the "root" of the bundle.

Is it at all possible to import resources that aren开发者_高级运维't package scoped in to another bundle?

What I would like to achieve is this:

Bundle A has a file resource in the "root"

Bundle B imports bundle A:s packages and resources. Through bundle B:s ClassLoader, I'd like to be able to load the resource in bundle A as if it existed in Bundle B.

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Resources in the root of a bundle are in the "default" package, which cannot be imported or exported.

If you really must access the resources via classloader, you need to move them into a package and export that package. Otherwise you can use Bundle.getEntry() to read resources from any location of any bundle.

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You can use OSGi Fragment bundles. For your case: bundle B is a host and bundle A is a fragment of the bundle B. But bundle B has access to all classes and resources (folders) of bundle A.

More details in OSGi Core Spec #3.13 Fragment bundles

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Create a new thread and then create a new classloader that points to the files needed.

Look at this fragment:

ClassLoader c = new URLClassLoader(urls);
thread.setContextClassLoader(c);

The thread classloader will then be able load the files within the package where the URLs include the absolute location to the bundle.