I need to further inspect this error, but got this one using a custom distribution with some third party bundles:
11:01:57.410 INFO [features-3-thread-1] Pax Web started 11:01:57.446 INFO [features-3-thread-1] org.apache.aries.jmx.whiteboard/1.2.0 11:01:57.534 ERROR [paxweb-config-1-thread-1] Unable to start pax web server: Duplicate method name "$$FCCL$$java#util#ServiceLoader$load$java#lang#Class" with signature "(Ljava.lang.Class;)V" in class file org/eclipse/jetty/http/PreEncodedHttpField java.lang.ClassFormatError: Duplicate method name "$$FCCL$$java#util#ServiceLoader$load$java#lang#Class" with signature "(Ljava.lang.Class;)V" in class file org/eclipse/jetty/http/PreEncodedHttpField at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?] at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[?:?] at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.defineClass(BundleWiringImpl.java:2410) ~[?:?] at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2194) ~[?:?] at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1607) ~[?:?] at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:80) ~[?:?] at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2053) ~[?:?] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:?] at org.apache.felix.framework.BundleWiringImpl.getClassByDelegation(BundleWiringImpl.java:1414) ~[?:?] at org.apache.felix.framework.BundleWiringImpl.searchImports(BundleWiringImpl.java:1660) ~[?:?] at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1590) ~[?:?] at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:80) ~[?:?] at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2053) ~[?:?] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:?] at org.ops4j.pax.web.service.jetty.internal.JettyServerImpl.<init>(JettyServerImpl.java:97) ~[?:?] at org.ops4j.pax.web.service.jetty.internal.JettyFactoryImpl.createServer(JettyFactoryImpl.java:90) ~[?:?] at org.ops4j.pax.web.service.jetty.internal.ServerControllerImpl$Stopped.start(ServerControllerImpl.java:443) ~[?:?] at org.ops4j.pax.web.service.jetty.internal.ServerControllerImpl.start(ServerControllerImpl.java:81) ~[?:?] at org.ops4j.pax.web.service.jetty.internal.ServerControllerFactoryImpl$1.start(ServerControllerFactoryImpl.java:164) ~[?:?] at org.ops4j.pax.web.service.jetty.internal.ServerControllerImpl$Unconfigured.configure(ServerControllerImpl.java:788) ~[?:?] at org.ops4j.pax.web.service.jetty.internal.ServerControllerImpl.configure(ServerControllerImpl.java:97) ~[?:?] at org.ops4j.pax.web.service.internal.Activator.updateController(Activator.java:347) ~[?:?] at org.ops4j.pax.web.service.internal.Activator.lambda$scheduleUpdateFactory$2(Activator.java:291) ~[?:?] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:?] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?] at java.lang.Thread.run(Thread.java:748) [?:?] 2018-04-04 9:22 GMT+02:00 Christian Schneider <ch...@die-schneider.net>: > I found two issues until now: > > - When you start karaf on windows, then stop with Ctrl-D the java process > does not end. > - There is org.osgi.core-6.0.0.jar in the boot dir. I doubt it should be > part of the deployment. > > Christian > > 2018-04-03 10:25 GMT+02:00 Jean-Baptiste Onofré <j...@nanthrax.net>: > >> Hi all, >> >> I submit Karaf (Container) 4.2.0 release to your vote. >> >> This is the first GA on the 4.2.x series, following M1 and M2. >> >> NB: I preferred to postpone the merge of the new examples as it needs a >> little >> polish. The PR is already available and it will be included in 4.2.1 (that >> we >> can expect beginning of May depending of 4.2.0 feedbacks): >> https://github.com/apache/karaf/pull/484 >> >> Release Notes: >> https://issues.apache.org/jira/secure/ReleaseNote.jspa? >> projectId=12311140&version=12342076 >> >> Staging Repository: >> https://repository.apache.org/content/repositories/orgapachekaraf-1110/ >> >> Git Tag: >> karaf-4.2.0 >> >> Please vote to approve this release: >> >> [ ] +1 Approve the release >> [ ] -1 Don't approve the release (please provide specific comments) >> >> This vote will be open for at least 72 hours. >> >> Thanks, >> Regards >> JB >> -- >> Jean-Baptiste Onofré >> jbono...@apache.org >> http://blog.nanthrax.net >> Talend - http://www.talend.com >> > > > > -- > -- > Christian Schneider > http://www.liquid-reality.de > > Computer Scientist > http://www.adobe.com