noclassdeffounderror

So, I have an installed extension (see http://docs.oracle.com/javase/tutorial/ext/basics/index.html ) which I can see in Eclipse. I've written a simple rcp application that tries to create an instance of a class in this extension. However, although everything compiles ok, I'm getting a NoClassDefFoundError when creating the instance. I'm assuming this has something to do with OSGi because I can run a simple java application that creates the instance fine. Any suggestions would be really appreciated. Thanks I've found another solution which is to set the parent classloader to the 'ext'

I have been trying to get Google Cloud Messaging to work in eclipse. I was able to compile the example given on their demo webpage and run that without any errors; however, when I try to create my own example using jersey I get the run time error "java.lang.NoClassDefFoundError: com/google/android/gcm/server/Sender" when the following code tries to create a sender. @POST @Path("/send") public Response sendMessage() throws IOException { Sender sender = new Sender("api_key"); Message message = new Message.Builder().build(); sender.send(message, DataStore.getDevices(), 5); return Response.status

For running all my test classes automatically, I look for all class files inside a dedicated directory, convert the path to a package name and check if this class implements the given interface: try { Class<? > myTestClass = Class.forName( constructedClassName ); if( myTestClass.isInstance( MyTestInterface.class ) ) { testCollection.add( myTestClass ); } } catch( Error e ) { // ignore, no valid test class } Today I ran into an ugly bug ( see this SO question ) using this technique. Question: How can I collect all my test classes without having to ignore Errors that can occur with classes I'm

I have a quick question regarding javac and packages in Java. I have a simple program (we'll call it Program.java) which is currently in the following directory: myRepository/myProgram In Program.java and other .java files in the myRepository/myProgram directory, I have declared package myProgram.* and also included import myProgram.*; . So when I type javac myProgram/Program.java , it compiles fine and it runs fine if I type java myProgram/Program . However, I'm trying to get the .class files to be produced in the myRepository directory, not myRepository/myProgram , which is where the source

I have a quite weird problem with some Android projects and Eclipse. I have a number of Android projects that all use much of the same code, and have therefore moved a lot of code into an Android Library project. This has, for a long time, worked quite well for three apps. Today, I wanted to use the library for a fourth app as well, and ran into trouble. Basically, the situation is as follows: Library project: contains a set of activities as well as some utility classes New project: instantiates one of the activities from the library project in a certain situation. This should all be trivial