Jenkins does not start on ARM+OpenJDK+JamVM

The error message indicates that JamVM doesn't properly implement java.lang.Class.getEnclosingClass(). This method is returning null when it shouldn't --- as such I consider it a bug in JamVM.

I have forwarded this bug to the JamVM mailinglist:

It looks like JamVM source for the gnuclasspath bindings have support for getEnclosingClass, I will look into getting the JamVM+OpenJDK combination to implement the same bindings.

(oneiric)xranby@ac100:~/icedtea6-jamvm/jamvm/jamvm/src/classlib$ grep getEnclosing -r *
gnuclasspath/reflect.c:Class *getEnclosingClass(Class *class) {
gnuclasspath/reflect.c:MethodBlock *getEnclosingMethod(Class *class) {
gnuclasspath/reflect.c: Class *enclosing_class = getEnclosingClass(class);
gnuclasspath/reflect.c:Object *getEnclosingMethodObject(Class *class) {
gnuclasspath/reflect.c: MethodBlock *mb = getEnclosingMethod(class);
gnuclasspath/reflect.c:Object *getEnclosingConstructorObject(Class *class) {
gnuclasspath/reflect.c: MethodBlock *mb = getEnclosingMethod(class);
gnuclasspath/natives.c:uintptr_t *getEnclosingClass0(Class *class, MethodBlock *mb,
gnuclasspath/natives.c: *ostack++ = (uintptr_t) getEnclosingClass(clazz);
gnuclasspath/natives.c:uintptr_t *getEnclosingMethod0(Class *class, MethodBlock *mb,
gnuclasspath/natives.c: *ostack++ = (uintptr_t) getEnclosingMethodObject(clazz);
gnuclasspath/natives.c:uintptr_t *getEnclosingConstructor(Class *class, MethodBlock *mb,
gnuclasspath/natives.c: *ostack++ = (uintptr_t) getEnclosingConstructorObject(clazz);
gnuclasspath/natives.c: {"getEnclosingClass", NULL, getEnclosingClass0},
gnuclasspath/natives.c: {"getEnclosingMethod", NULL, getEnclosingMethod0},
gnuclasspath/natives.c: {"getEnclosingConstructor", NULL, getEnclosingConstructor},
gnuclasspath/lib/java/lang/VMClass.java: Class enclosingClass = getEnclosingClass(klass);
gnuclasspath/lib/java/lang/VMClass.java: static native Class getEnclosingClass(Class klass);
gnuclasspath/lib/java/lang/VMClass.java: static native Constructor getEnclosingConstructor(Class klass);
gnuclasspath/lib/java/lang/VMClass.java: static native Method getEnclosingMethod(Class klass);

Robert Lougher have posted a fix for this issue on the JamVM mailinglist:
http://sourceforge.net/mailarchive/message.php?msg_id=27957556

Patch for task 1) to make JamVM pass the xstream runtime check.
The patch makes xstream accept all JVM that run on top of OpenJDK or IcedTea builds to be ok to use.

Thanks for the patch Xerxes - I took the liberty of reporting this upstream and submitting the patch to Jenkins as well:

https://issues.jenkins-ci.org/browse/JENKINS-10752

The fix for task 2) have been pushed upstream to JamVM and IcedTea6:
http://git.berlios.de/cgi-bin/cgit.cgi/jamvm/commit/?id=15f0fcf749071c7fa1bf0431e044e55143e94844
http://icedtea.classpath.org/hg/icedtea6/rev/759b17771e6a498046d728fa7443b3f32f067698

It will get pulled in in the next openjdk-6 update in Oneiric.

New problem
task 3) the /usr/share/jenkins/jankins.war from the jenkins package contains its own copy of xstream-debian.jar in WEB-INF/lib/xstream-debian.jar that needs to get updated for xstream to pass the runtime check.
It would be good if Jenkins could use the system installed /usr/share/java/jenkins-xstream-1.3.1-hudson-8.jar .
Right now Jenkins are only using its own local xstream copy that only gets updated at buildtime of the jenkins package.

The OpenJDK 6 6b23~pre8-1ubuntu1 package contains the fix for task 2)

> New problem
> task 3) the /usr/share/jenkins/jankins.war from the jenkins package contains its own copy of xstream-debian.jar in WEB-INF/lib/xstream-debian.jar that needs to get updated for xstream to pass the runtime check.
> It would be good if Jenkins could use the system installed /usr/share/java/jenkins-xstream-1.3.1-hudson-8.jar .
> Right now Jenkins are only using its own local xstream copy that only gets updated at build time

Hi Xerces

Aware of this issue but no good way to work around the fact that java web applications bundle all dependencies at the moment - effectively static linking

I need to resolve a minor issue with the upstart script which will require a rebuild - but need xstream winstone and jcaptcha proposed branches to land first.

I'll push an updated version to an arm enabled ppa in the next few hours.

Xerces

I've uploaded a new version of jenkins + all updated dependencies to:

  ppa:hudson-ubuntu/testing

This PPA is ARM enabled so should be good for testing; trying it ATM but my pandaboard just became unresponsive and I'm not local to it....

The new version of jenkins + all updated dependencies in the PPA:
  ppa:hudson-ubuntu/testing
makes Jenkins on ARM+OpenJDK+JamVM work!

I am looking forward to see these fixes merged into the Oneiric archive.

This bug was fixed in the package jenkins-xstream - 1.3.1-hudson-8-0ubuntu2

---------------
jenkins-xstream (1.3.1-hudson-8-0ubuntu2) oneiric; urgency=low

  [ Xerces Ranby ]
  * debian/patches/openjdk-icedtea-support.patch: Add support for OpenJDK
    or IcedTea based JVM's to enable use on ARM based architectures
    (LP: #827463).
 -- James Page <email address hidden> Thu, 18 Aug 2011 09:14:29 +0100

This bug was fixed in the package jenkins - 1.409.1-0ubuntu2

---------------
jenkins (1.409.1-0ubuntu2) oneiric; urgency=low

  * Resolved issue with specific group being set in upstart
    configuration (LP: #820938).
  * Rebuild to pickup new versions of jenkins-xstream to enable ARM
    compatibility (LP: #827463).
  * Rebuild to pickup new versions of jcaptcha and jenkins-winstone to
    resolve compatibiltiy issues with libservlet2.5-java (LP: #827651).
  * Fix FTBFS due to missing fonts causing test failure in Jenkins core:
     - debian/control: added ttf-dejavu-core to Build-Depends-Indep.
  * Fix FTBFS due to change in location of jtidy maven artifact:
     - debian/maven.rules: switch jtidy -> net.sf.jtidy to pickup new
       location.
 -- James Page <email address hidden> Tue, 06 Sep 2011 16:53:57 +0100