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  1. Jenkins
  2. JENKINS-8914

Jenkins 1.399: java.lang.UnsupportedClassVersionError: Bad version number in .class file using JmDNS 3.4.0


    • Icon: Bug Bug
    • Resolution: Fixed
    • Icon: Major Major
    • core
    • None
    • Debian Lenny running Linux 2.6.26-2-amd64
      Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_22-b03, mixed mode)
      Tomcat 5.5


      I have upgraded my Jenkins server at home using the latest 1.399 WAR with the intention to fix #JENKINS-8647 (growing log files due to an issue in JmDNS) but it seems that the compatibility with Java 5 is broken by jmdns-3.4.0.jar

      I get the following stack trace in my catalina.log at server initialization:

      28 févr. 2011 22:59:49 hudson.WebAppMain$2 run
      GRAVE: Failed to initialize Hudson
      java.lang.UnsupportedClassVersionError: Bad version number in .class file
              at java.lang.ClassLoader.defineClass1(Native Method)
              at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
              at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
              at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1853)
              at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:875)
              at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1330)
              at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1209)
              at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
              at hudson.DNSMultiCast.<init>(DNSMultiCast.java:26)
              at hudson.model.Hudson.<init>(Hudson.java:691)
              at hudson.model.Hudson.<init>(Hudson.java:605)
              at hudson.WebAppMain$2.run(WebAppMain.java:221)

      I will try to build JmDNS 3.4.0 with a Java 5 JDK and see if it fixes the issue. I believe this should be patched in the next release, I might not be the last person stuck with Java 5

      Thanks & regards,

            laurents59 Laurent Schoelens
            jb_lievremont Jean-Baptiste Lièvremont
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