Wednesday, March 4, 2009

Class.forname and classloader.loadclass - whats bettr in OSGi

ClassLoader.loadClass or Class.forName seem to be synonyms for the same basic operation:
but class.forname does additional constraint checks which can cause some problems in the context of OSGi.So it does seem reasonable to have Class.forName behavior altered to avoid loader constraint checks.
However, if Class.forName is used to call the initiating class loader, the behavior with respect to cachinga nd the returned class is quite different. In this case, when the class is first defined, it is cached by the defining class loader as expected. But it is also cached by the initiating class loader which is not expected.
As a result, all calls to Class.forName to a initiating class loader always return the same class object (thefirst one loaded), even if the implementation of the initiating class loader does not define classes or directlyconsult its own cache.
My case where class.forname didnt wrk and classloader.loadclass worked
Bundle A->class AA, extends Server,calls init

class ToBeLoaded ,exports ToBeLoaded
Bundle B->class Server, method init()->tries to load class ToBeLoaded

Ref :

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