Btw:
@Resource(lookup = "java:app/osgi/Bundle")
Bundle activatorBundle;
public <T> T getService(Class<T> serviceInterface) {
return activatorBundle.getBundleContext()
.getService(activatorBundle.getBundleContext().getServiceReference(serviceInterface));
}
-----Original Message-----
From: Remo Liechti [mailto:[email protected]]
Sent: Mittwoch, 24. August 2016 09:36
To: [email protected]
Subject: LinkageError, but why?
Hi Guys
As you know by now, I wrap an osgi application into a j2ee web app on Weblogic.
Weblogic uses felix.
I can successfully deploy the app and communicate on sockets with it, all fine.
But when it comes to accessing the app using the OSGI Services, I can call a
few methods. However, as soon as I call a method on a service that has non
Java-Datatypes, I get LinkageErrors, like this one:
java.lang.LinkageError: loader constraint violation: loader (instance of
org/apache/felix/framework/BundleWiringImpl$BundleClassLoaderJava5) previously
initiated loading for a different type with name
"com/kuka/nav/robot/MobileRobotType"
at
com.kuka.nav.fleet.simulation.internal.FleetSimulationImpl.addRobot(FleetSimulationImpl.java:137)
at
com.kuka.nav.fleet.simulation.internal.FleetSimulationImpl.addRobot(FleetSimulationImpl.java:177)
at com.swisslog.wm6.test.MoveServlet.processRequest(MoveServlet.java:71)
at com.swisslog.wm6.test.MoveServlet.doGet(MoveServlet.java:95)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
What I try to achieve is:
69: IResourceManager resMan = getService(IResourceManager.class);
70: FleetSimulation simulation = (FleetSimulation)
resMan.getResource("FleetSimulation").getCapability(FleetSimulation.class);
71: simulation.addRobot(new BasicRobotType(7), "Robotinator");
72: simulation.startAllRobots();
As you can see, the type to pass to addRobot is of BasicRobotType.
We tried with a different method, that instead of a BasicRobotType takes a
regular integer instead:
69: IResourceManager resMan = getService(IResourceManager.class);
70: FleetSimulation simulation = (FleetSimulation)
resMan.getResource("FleetSimulation").getCapability(FleetSimulation.class);
71: simulation.addRobot(7, "Robotinator");
72: simulation.startAllRobots();
Information about the classes:
public interface MobileRobotType
public final class BasicRobotType implements MobileRobotType The java classes
are in a single jar file and are not duplicated on the classpath.
This works fine then. But this also means we would have to change the API
significantly and to a low level API who nobody likes.
Any idea what can be done to solve the linkage error? Maybe any Devs out there
of felix itself?
Thanks
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