Incorrect Candidate permutation failed due to a conflict between imports exception when using host and fragment bundles ----------------------------------------------------------------------------------------------------------------------- Key: AS7-5958 URL: https://issues.jboss.org/browse/AS7-5958 Project: Application Server 7 Issue Type: Bug Components: OSGi Affects Versions: 7.2.0.Alpha1 Environment: Windows XP SP3 Reporter: Paul Illingworth Labels: OSGI I am getting the following exception when my bundle is being resolved. I don't believe this is correct. {noformat} 2012-11-15 15:10:41,403 DEBUG [org.jboss.osgi.resolver](qtp4105020-187) Candidate permutation failed due to a conflict between imports; will try another if possible.: org.osgi.service.resolver.ResolutionException: Uses constraint violation. Unable to resolve resource resource-console-web [HostBundleRevision[resource-console-web:1.0.0.SNAPSHOT]] because it is exposed to package 'com.google.inject' from resources com.google.inject [HostBundleRevision[com.google.inject:3.0.0]] and com.google.inject [HostBundleRevision[com.google.inject:3.0.0]] via two dependency chains. Chain 1: resource-console-web [HostBundleRevision[resource-console-web:1.0.0.SNAPSHOT]] import: null | export: osgi.wiring.package=com.google.inject com.google.inject [HostBundleRevision[com.google.inject:3.0.0]] Chain 2: resource-console-web [HostBundleRevision[resource-console-web:1.0.0.SNAPSHOT]] import: null | export: osgi.wiring.package=com.saaconsultants.gwt.rpc.server.servlets; uses:=com.google.inject reims-gwt-rpc [HostBundleRevision[reims-gwt-rpc:1.0.0.SNAPSHOT]] import: null | export: osgi.wiring.package=com.google.inject com.google.inject [HostBundleRevision[com.google.inject:3.0.0]] at org.apache.felix.resolver.ResolverImpl.checkPackageSpaceConsistency(ResolverImpl.java:1142) at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:197) at org.jboss.osgi.resolver.felix.StatelessResolver.resolve(StatelessResolver.java:56) at org.jboss.osgi.framework.internal.ResolverPlugin.resolveAndApply(ResolverPlugin.java:152) at org.jboss.osgi.framework.internal.ResolverPlugin.resolveAndApply(ResolverPlugin.java:167) at org.jboss.osgi.framework.internal.AbstractBundleState.ensureResolved(AbstractBundleState.java:598) at org.jboss.osgi.framework.internal.HostBundleState.startInternal(HostBundleState.java:214) at org.jboss.osgi.framework.internal.AbstractBundleState.start(AbstractBundleState.java:520) at org.apache.felix.webconsole.internal.core.BundlesServlet.doPost(BundlesServlet.java:331) at javax.servlet.http.HttpServlet.service(HttpServlet.java:713) at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) at org.apache.felix.webconsole.internal.servlet.OsgiManager.service(OsgiManager.java:437) at org.apache.felix.webconsole.internal.servlet.OsgiManager.service(OsgiManager.java:384) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.ops4j.pax.web.service.internal.HttpServiceStarted$2.invoke(HttpServiceStarted.java:209) at org.ops4j.pax.web.service.internal.$Proxy39.service(Unknown Source) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:547) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:480) at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:70) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:941) at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:117) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:875) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117) at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:74) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110) at org.eclipse.jetty.server.Server.handle(Server.java:349) at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441) at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:936) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:801) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:224) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:51) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:586) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:44) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533) at java.lang.Thread.run(Thread.java:662) 2012-11-15 15:10:41,403 TRACE [org.jboss.osgi.framework](qtp4105020-187) Release framework lock {noformat} It seems to be happening because the ResolverImpl.isCompatible() method is comparing two capabilities; one is an AbstractBundleCapability and the other is a WrappedCapability that contains the same instance of AbstractBundleCapability. The result of the comparison is false. As a quick hack I changed the equals method of WrappedCapability to {noformat} @Override public boolean equals(Object obj) { return m_cap.equals(obj); } {noformat} and that seemed to make it work and resolution was successful.