How to get list of classes from a package (original) (raw)

Rémi Forax forax at univ-mlv.fr
Mon Feb 16 20:35:53 UTC 2009

Tom Hawtin a écrit :

David M. Lloyd wrote:

On 02/16/2009 10:22 AM, Ulf Zibis wrote:

can anybody tell me, how I could get al list or enumeration of the classes, which belong to a package. I can't see any appropriate method in java.lang.Package :-( This isn't really possible at run time, since one doesn't know whether a class exists until one tries to load it. The classloader might not even know. Also, a package can span classloaders, adding more complexity to the problem. IIRC, you will get a different Package for each class loader, for a given package name. Certainly classes with the same package name will not have Java access to default/protected members/classes/interface/constructors from different class loaders. But yes, a list of classes is not necessarily complete. Also, IIRC, Proxy dynamically inserts classes into packages as well. Tom Hawtin Ulf, if you can create an agent, you can get all loaded classes: http://download.java.net/jdk7/docs/api/java/lang/instrument/Instrumentation.html#getAllLoadedClasses()

But if you want thoses classes to find some that implement an interface, java.util.ServiceLoader is your friend: http://download.java.net/jdk7/docs/api/java/util/ServiceLoader.html

cheers, Rémi

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