OSGi Bundle in Felix - ClassNotFoundException for Jetty class loaded by name - osgi

Question

pom.xml:
<Import-Package>
org.eclipse.jetty.websocket.server,*
</Import-Package>
MANIFEST.MF:
Import-Package: org.eclipse.jetty.websocket.server;version="[9.2,10)"
Exception in Logs:
javax.servlet.ServletException: java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.server.WebSocketServerFactory
Felix Web Console:
Imported Packages org.eclipse.jetty.websocket.server,version=9.2.6 from
org.apache.felix.http.jetty (39)
Relevant code in org.eclipse.jetty.websocket.servlet.WebSocketServletFactory:
Class<WebSocketServletFactory> wssf = (Class<WebSocketServletFactory>)loader
.loadClass("org.eclipse.jetty.websocket.server.WebSocketServerFactory");
Please help me figure out what I am doing wrong here?

Answer 1

I've ran into the same problem, and asked on the Felix mailing list. As pointed out by Balazs, it has to do with the "loader" part.
The thread at http://www.mail-archive.com/users%40felix.apache.org/msg16222.html contains a URL to some examples in which the ContextClassLoader is used.
With thanks to Paul, basically you need something like this:
// Cache the current classloader
ClassLoader ccl = Thread.currentThread().getContextClassLoader();
// Find the classloader used by the bundle providing jetty
ClassLoader classLoader = jettyBundle.getClassLoader();
// Set the classloader
Thread.currentThread().setContextClassLoader(classLoader);
// Register the servlet
httpService.registerServlet("/servletName", new MyWebSocketServlet(), null, null);
// Restore the classloader
Thread.currentThread().setContextClassLoader(ccl);
See the examples for more complete code.