ClassLoader.getSystemResource() does not work in OSGI Bundle

Question

I had an existing jar, which I have converted to OSGI Bundle now.

Problem is that now (as OSGI Bundle), it can not load resources. I am using ClassLoader.getSystemResource() method, it returns null .

Used code:

java.net.URL jdbc = ClassLoader.getSystemResource("com/company/cfg/provider/JDBC.xml");

I do not have access to source code so please tell some way by changing configuration (manifest file or something else) to make it work.

Bundle.getResource() works but I can not change the source code.

Answer 1

The reason for that is that an OSGi bundle uses it's own ClassLoaders. So what you want to do is get a hold of the OSGi ClassLoader:

    java.net.URL jdbc = getClass().getClassLoader()
                                  .getResource("com/company/cfg/provider/JDBC.xml");

Or in the case the call happens in a static context with in the class MyClass :

java.net.URL jdbc = MyClass.class.getClassLoader()
                              .getResource("com/company/cfg/provider/JDBC.xml");

The difference between calling the static ClassLoader and getClass().getClassLoader() , is that in the first case you get an instance of java.lang.ClassLoader which cannot handle OSGi bundles properly, and the second call will get a ClassLoader that was used to load the current class which is part of an OSGi bundle.