Hi Baptiste! Thank you for your reply.
Following your advice I looked into Knopflerfish OSGi framework and verified that it does provide Servlet 2.5.0 in the JSDK-API bundle, and its implementation of HTTP Service uses Servlet 2.5.0. Subsequently, I tried to install Jetty OSGi bundles one at a time but ran into troubles with dependencies. Thus, I installed Pax Web OPS4J (http://wiki.ops4j.org/display/paxweb/Pax+Web) which includes Jetty 6. With my bundle including gwt-user.jar for, which exports GWT RPC packages (but not javax.servlet and javax.servlet.http), I then started Pax Web and checked that HTTP Service was available. Then I started my GWT RPC Web App OSGi bundle but ran in the same trouble. If I try to use Pax Web or Knopflerfish HTTP Server, I get very similar errors always re/ IncompatobleClassChangeError as you can see in the pasted output: --- Output w/ Knopflerfish OSGi HTTP Server --- [stdout] HTTP Service is available [stderr] java.lang.IncompatibleClassChangeError [stderr] at org.knopflerfish.bundle.http.ServletRegistration.<init> (ServletRegistration.java:77) [stderr] at org.knopflerfish.bundle.http.HttpServiceImpl.registerServlet (HttpServiceImpl.java:173) [stderr] at edu.uta.crewman.giacomo.gwt.servlet.Activator.start (Activator.java:46) [stderr] at org.knopflerfish.framework.BundleImpl.start0 (BundleImpl.java:374) [stderr] at org.knopflerfish.framework.PermissionOps.callStart0 (PermissionOps.java:215) [stderr] at org.knopflerfish.framework.BundleImpl.start (BundleImpl.java:321) [stderr] at org.knopflerfish.bundle.desktop.swing.Desktop.startBundle (Desktop.java:2198) [stderr] at org.knopflerfish.bundle.desktop.swing.Desktop $16.actionPerformed(Desktop.java:735) [stderr] at javax.swing.AbstractButton.fireActionPerformed (AbstractButton.java:1995) [stderr] at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2318) [stderr] at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:387) [stderr] at javax.swing.DefaultButtonModel.setPressed (DefaultButtonModel.java:242) [stderr] at javax.swing.plaf.basic.BasicButtonListener.mouseReleased (BasicButtonListener.java:236) [stderr] at java.awt.AWTEventMulticaster.mouseReleased (AWTEventMulticaster.java:272) [stderr] at java.awt.Component.processMouseEvent(Component.java:6216) [stderr] at javax.swing.JComponent.processMouseEvent(JComponent.java: 3265) [stderr] at java.awt.Component.processEvent(Component.java:5981) [stderr] at java.awt.Container.processEvent(Container.java:2041) [stderr] at java.awt.Component.dispatchEventImpl(Component.java:4583) [stderr] at java.awt.Container.dispatchEventImpl(Container.java:2099) [stderr] at java.awt.Component.dispatchEvent(Component.java:4413) [stderr] at java.awt.LightweightDispatcher.retargetMouseEvent (Container.java:4556) [stderr] at java.awt.LightweightDispatcher.processMouseEvent (Container.java:4220) [stderr] at java.awt.LightweightDispatcher.dispatchEvent (Container.java:4150) [stderr] at java.awt.Container.dispatchEventImpl(Container.java:2085) [stderr] at java.awt.Window.dispatchEventImpl(Window.java:2475) [stderr] at java.awt.Component.dispatchEvent(Component.java:4413) [stderr] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) [stderr] at java.awt.EventDispatchThread.pumpOneEventForFilters (EventDispatchThread.java:269) [stderr] at java.awt.EventDispatchThread.pumpEventsForFilter (EventDispatchThread.java:184) [stderr] at java.awt.EventDispatchThread.pumpEventsForHierarchy (EventDispatchThread.java:174) [stderr] at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:169) [stderr] at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:161) [stderr] at java.awt.EventDispatchThread.run(EventDispatchThread.java: 122) --- Output w/ Pax Web Jetty 6 --- [stdout] HTTP Service is available [stderr] java.lang.IncompatibleClassChangeError [stderr] at org.mortbay.jetty.servlet.ServletHolder.initServlet (ServletHolder.java:431) [stderr] at org.mortbay.jetty.servlet.ServletHolder.doStart (ServletHolder.java:263) [stderr] at org.mortbay.component.AbstractLifeCycle.start (AbstractLifeCycle.java:50) [stderr] at org.mortbay.jetty.servlet.ServletHandler.initialize (ServletHandler.java:676) [stderr] at org.mortbay.jetty.servlet.ServletHandler.updateMappings (ServletHandler.java:1044) [stderr] at org.mortbay.jetty.servlet.ServletHandler.setServletMappings (ServletHandler.java:1101) [stderr] at org.mortbay.jetty.servlet.ServletHandler.addServletMapping (ServletHandler.java:800) [stderr] at org.ops4j.pax.web.service.internal.JettyServerImpl$1.call (JettyServerImpl.java:139) [stderr] at org.ops4j.pax.web.service.internal.JettyServerImpl$1.call (JettyServerImpl.java:136) [stderr] at org.ops4j.pax.swissbox.core.ContextClassLoaderUtils.doWithClassLoader (ContextClassLoaderUtils.java:60) [stderr] at org.ops4j.pax.web.service.internal.JettyServerImpl.addServlet (JettyServerImpl.java:131) [stderr] at org.ops4j.pax.web.service.internal.ServerControllerImpl $Started.addServlet(ServerControllerImpl.java:236) [stderr] at org.ops4j.pax.web.service.internal.ServerControllerImpl.addServlet (ServerControllerImpl.java:93) [stderr] at org.ops4j.pax.web.service.internal.HttpServiceStarted.registerServlet (HttpServiceStarted.java:144) [stderr] at org.ops4j.pax.web.service.internal.HttpServiceProxy.registerServlet (HttpServiceProxy.java:53) [stderr] at edu.uta.crewman.giacomo.gwt.servlet.Activator.start (Activator.java:46) [stderr] at org.knopflerfish.framework.BundleImpl.start0 (BundleImpl.java:374) [stderr] at org.knopflerfish.framework.PermissionOps.callStart0 (PermissionOps.java:215) [stderr] at org.knopflerfish.framework.BundleImpl.start (BundleImpl.java:321) [stderr] at org.knopflerfish.bundle.desktop.swing.Desktop.startBundle (Desktop.java:2198) [stderr] at org.knopflerfish.bundle.desktop.swing.Desktop $16.actionPerformed(Desktop.java:735) [stderr] at javax.swing.AbstractButton.fireActionPerformed (AbstractButton.java:1995) [stderr] at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2318) [stderr] at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:387) [stderr] at javax.swing.DefaultButtonModel.setPressed (DefaultButtonModel.java:242) [stderr] at javax.swing.plaf.basic.BasicButtonListener.mouseReleased (BasicButtonListener.java:236) [stderr] at java.awt.AWTEventMulticaster.mouseReleased (AWTEventMulticaster.java:272) [stderr] at java.awt.Component.processMouseEvent(Component.java:6216) [stderr] at javax.swing.JComponent.processMouseEvent(JComponent.java: 3265) [stderr] at java.awt.Component.processEvent(Component.java:5981) [stderr] at java.awt.Container.processEvent(Container.java:2041) [stderr] at java.awt.Component.dispatchEventImpl(Component.java:4583) [stderr] at java.awt.Container.dispatchEventImpl(Container.java:2099) [stderr] at java.awt.Component.dispatchEvent(Component.java:4413) [stderr] at java.awt.LightweightDispatcher.retargetMouseEvent (Container.java:4556) [stderr] at java.awt.LightweightDispatcher.processMouseEvent (Container.java:4220) [stderr] at java.awt.LightweightDispatcher.dispatchEvent (Container.java:4150) [stderr] at java.awt.Container.dispatchEventImpl(Container.java:2085) [stderr] at java.awt.Window.dispatchEventImpl(Window.java:2475) [stderr] at java.awt.Component.dispatchEvent(Component.java:4413) [stderr] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) [stderr] at java.awt.EventDispatchThread.pumpOneEventForFilters (EventDispatchThread.java:269) [stderr] at java.awt.EventDispatchThread.pumpEventsForFilter (EventDispatchThread.java:184) [stderr] at java.awt.EventDispatchThread.pumpEventsForHierarchy (EventDispatchThread.java:174) [stderr] at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:169) [stderr] at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:161) [stderr] at java.awt.EventDispatchThread.run(EventDispatchThread.java: 122) Since the error is the same, the problem is somewhere else in my GWT RPC Web App and the OSGi bundle I created from gwt-user.jar, so that I came up with following ideas: (i) Should I export javax.servlet from the OSGi bundle created from gwt-user.jar? (ii) Is my GWT RPC Web App dependent on Servlet 2.4.0 so that I run into trouble having Servlet 2.5.0 in my OSGi framework? This shouldn't be the case as demonstrated from following observation. When I developed a Servlet in Eclipse (relying on Servlet 2.4.0) and deployed to Knopflerfish (which provides 2.5.0), everything ran fine. You might be wondering why I keep using Knopflerfish. Well, that's because I don't want to risk end up using Equinox's specific features and stay OSGi-compliant as much as possible. Thank you, Gia On Jun 4, 7:57 am, Baptiste Boussemart <baptisteboussem...@gmail.com> wrote: > Hi, > > I think it is because you don't use the Servlet 2.4. > As far I know, the default HTTP server doesn't provide this > requirement. > > I use GWT on Equinox and Jetty, which provides Servlet 2.4. > So you need to use Jetty. > > Hope that this answers to your question. > > Regards, > Baptiste Boussemart > > On 3 juin, 23:54, giacomo <gia.ghid...@gmail.com> wrote: > > > Hi everyone! > > > I'm trying to get the simple Web application in GWT 1.6.4 featuring > > GWT RPC to work in Knopflerfish OSGi framework 2.3.1 (an > > implementation of the OSGi framework like Equinox). > > > For that matter I created an OSGi bundle from the GWT project and > > added an implementation of BundleActivator in which I register the > > client-side Web page and the server-side GWT RemoteServiceServlet with > > the OSGi-defined HTTP Service. > > > Separately, I created an OSGi bundle from gwt-user.jar and exported > > the required packages for RPC but not javax.servlet as this is already > > exported by the JSDK in Knopflerfish. > > > When I start the bundle created from the GWT project, the > > BundleActivator.start() method is executed and the client-side Web > > page is successfully registered in the HTTP Service. When I open my > > Web browser (Mozilla Firefox) and point it to the given address, I can > > view the Web page. Unfortunately, I get a > > java.lang.IncompatibleClassChangeError during execution of the start > > method from within the Knopflerfish OSGi framework apparently due to > > javax.servlet.Servlet. > > > If I try to define a traditional Servlet in the same project and > > register it from the BundleActivator, everything works fine. Thus, my > > conclusion is that the problem is related to RemoteServiceServlet > > inheritance of javax.servlet.Servlet which doesn't comply with > > Knopflerfish OSGi framework definition of javax.servlet.Servlet. > > > It looks like as if a definition of Servlet is used when I compile the > > GWT project with GWT-generated Ant file and another one is made > > available by the Knopflerfish OSGi framework, if I'm not mistaken > > about the meaning of java.lang.IncompatibleClassChangeError. > > > I tried both to export and not to export javax.servlet from the OSGi > > bundle encapsulating gwt-user.jar but this didn't change anything. > > > Some related info. I read the post by Ian Bull on his blog > > athttp://blog.ianbull.com/2008/09/gwt-and-osgi.htmlbutthat refers to a > > previous version of GWT and uses Eclipse Equinox, not Knopflerfish. > > Thus, I couldn't figure it out from there. > > > Thanks in advance, > > > Gia --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~----------~----~----~----~------~----~------~--~---
