"Unsupported major.minor version 52.0" As answered here ... http://stackoverflow.com/questions/31643512/upgrading-to-jetty-9-3-1-v20150714-caused-unsupported-major-minor-version-52-0/31683677#31683677
That's a standard error from Java indicating that you are using an older JVM than the Classes you are attempting to run. (the Unsupported major.minor version numbers might be different depending on scenario, but the number you are presented indicates the version of Java you need). I usually use the Wikipedia article on "Java Class File" <https://en.wikipedia.org/wiki/Java_class_file> to find out what the Class file major.minor version number translates to as far as a Java JVM requirement. As for Jetty 9.3+, that requires Java 8 per its announcement email. <https://dev.eclipse.org/mhonarc/lists/jetty-announce/msg00080.html> Joakim Erdfelt / [email protected] On Tue, Aug 11, 2015 at 9:25 AM, Arun Kumar <[email protected]> wrote: > Hi Joakim, > > I have deployed the code build using Jetty-all 9.jar and getting this > error. Previously the application was running on Jetty5(Mortbay). Now it is > referring to Jetty9 eclipse classes. I have copied Jetty-all9.jar into lib. > > -------------------------------------------------------------------------------------------------------------------- > > org/eclipse/jetty/server/Connector : Unsupported major.minor version 52.0 > > End user message : Jetty could not be started. Check nested exceptions > following this for reason > > [0] : java.lang.UnsupportedClassVersionError: > org/eclipse/jetty/server/Connector : Unsupported major.minor version 52.0 > > [1] : Jetty could not be started. Check nested exceptions following this > for reason > Caused by: java.lang.UnsupportedClassVersionError: > org/eclipse/jetty/server/Connector : > > Could you please help ?. > > Thanks > > On Mon, Aug 10, 2015 at 11:11 PM, Joakim Erdfelt <[email protected]> > wrote: > >> If you can, use normal Jetty dependencies, *NOT* jetty-all. >> Next, use something a bit more current. >> Either Jetty 9.2.13.v20150730 (for Java 7) or Jetty 9.3.2.v20150730 (for >> Java 8 and HTTP/2 support) >> >> Also note, that there is no drop-in replacement for Jetty 6 to Jetty 9. >> The project moved from codehaus.org (which doesn't exist anymore) to >> eclipse.org >> In the process the namespace changed from org.mortbay.jetty to >> org.eclipse.jetty >> So if you depend on Jetty classes somewhere in your code, you'll have to >> do some code updates. >> >> If this is a jetty-distribution update, then you'll be better off using >> the new ${jetty.base} concepts, as that is far far easier to manage and >> maintain then the old techniques of updating jars, configurations, xmls, >> etc ... >> >> >> Joakim Erdfelt / [email protected] >> >> On Mon, Aug 10, 2015 at 9:41 AM, Arun Kumar <[email protected]> >> wrote: >> >>> Hi Friends, >>> >>> I'm migrating the application from Jetty 6.1.19 to Jetty-all-9.1. I'm >>> able to surpass all the compile errors in Jetty-9 and able to build and >>> deploy. During this migration I have removed all the Jetty6 jars from lib >>> and placed Jetty-all. 9 jar. Is this correct that only Jetty6 jars >>> replaced with Jetty9 OR Do I need to any other files ? >>> >>> My application is using Spring 3. jars also. >>> >>> Thanks >>> >>> _______________________________________________ >>> jetty-users mailing list >>> [email protected] >>> To change your delivery options, retrieve your password, or unsubscribe >>> from this list, visit >>> https://dev.eclipse.org/mailman/listinfo/jetty-users >>> >> >> >> _______________________________________________ >> jetty-users mailing list >> [email protected] >> To change your delivery options, retrieve your password, or unsubscribe >> from this list, visit >> https://dev.eclipse.org/mailman/listinfo/jetty-users >> > > > _______________________________________________ > jetty-users mailing list > [email protected] > To change your delivery options, retrieve your password, or unsubscribe > from this list, visit > https://dev.eclipse.org/mailman/listinfo/jetty-users >
_______________________________________________ jetty-users mailing list [email protected] To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/jetty-users
