After upgrading from 355 to 356 we could not get any builds startet but get: Started by an SCM change FATAL: hudson.util.jna.GNUCLibrary (initialization failure) java.lang.NoClassDefFoundError: hudson.util.jna.GNUCLibrary (initialization failure) at java.lang.J9VMInternals.initialize(J9VMInternals.java:140) at hudson.Util.createSymlink(Util.java:1000) at hudson.model.Run.run(Run.java:1242) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:122) There used to be a similar issue (HUDSON-4820), current environment is similar Linux xxx 2.6.18-194.el5 #1 SMP Tue Mar 16 22:03:12 EDT 2010 ppc64 ppc64 ppc64 GNU/Linux /opt/ibm/java-ppc64-60/bin/java -version java version "1.6.0" Java(TM) SE Runtime Environment (build pxp6460sr8-20100409_01(SR8)) IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Linux ppc64-64 jvmxp6460sr8-20100401_55940 (JIT enabled, AOT enabled) J9VM - 20100401_055940 JIT - r9_20100401_15339 GC - 20100308_AA) JCL - 20100408_01