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[cross-project-issues-dev] hudson, tycho - Compiling against java 1.5
Hi all,

One of our plugins cannot be compiled against java 1.6 and has to be compiled with the javac of jdk 1.5. In short, one of the jdk classes has changed the signature of one of its methods' generics between the two versions (see version 1.5 [1] and version 1.6 [2]). AFAIK, the incompatibility is only at source level and the compiled classes should work with both the 1.5 and 1.6 runtimes. The problem, however, is "how" can I force tycho to use the jdk 1.5 compiler when run from the Eclipse hudson instance?

I read some documentation, most notably http://www.eclipse.org/tycho/sitedocs/tycho-compiler-plugin/compile-mojo.html that describes some potentially interesting options. "source" and "target" are not enough in my case. Telling javac that my sources are in 1.5 is not enough. "fork" seems out of the question when using tycho-compiler-plugin from version 0.14.1. My builds fail in "compileOutOfProcess is not supported" which rules out all options that require forking (compilerVersion, executable, ... and maybe others).

The "useJDK" option was promising... but for the life of me I could not understand how to provide the accurate "toolchains.xml" to my builds. Should it be located in the "<home>/.m2" of the hudsonBuild user? A way seems to exist since I found this option used in one of the eclipse repositories. See http://git.eclipse.org/c/cbi/platform-aggregator.git/tree/eclipse-parent/pom.xml?h=JunoSR1_RC1_R4 ... and the line just above the use of this option :
TODO provide CBI-specific wiki that explains how to setup BREE libraries and toolchain.xml
Yup, the wiki would have helped :).

The only remaining option I could find was to use  the workaround outlined by Bernd on the forum : http://www.eclipse.org/forums/index.php/t/201042/ .

    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.eclipse.tycho</groupId>
          <artifactId>tycho-compiler-plugin</artifactId>
          <version>${tycho-version}</version>
          <configuration>
            <compilerId>jdt</compilerId>
            <compilerArguments>
                <bootclasspath>/shared/common/jdk-1.5.0-22.x86_64/jre/lib/rt.jar</bootclasspath>
            </compilerArguments>
          </configuration>
        </plugin>
    </pluginManagement>

But that seems like a very fragile work around. Not to mention that now, my tests fail because of the tycho-surefire-plugin (https://hudson.eclipse.org/hudson/view/Modeling/job/emf-compare-master/322/console)...

If anyone here has any experience with tying tycho/hudson builds to a specific jdk, any workaround as to how we can provide a toolchains.xml for our build, or simply some input as to whether this "toolchains.xml" should be provided for all jobs that would like to use it (it seems to me like using the BREE of our plugins should be the "default" way of building our plugins instead of using the jdk 6...), I'd really appreciate the help :).

Laurent

[1] http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ExecutorService.html#invokeAll%28java.util.Collection%29
[2] http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/ExecutorService.html#invokeAll%28java.util.Collection%29
begin:vcard
fn:Laurent Goubet
n:Goubet;Laurent
org:<a href="http://www.obeo.fr";>Obeo</a>
email;internet:laurent.goubet@xxxxxxx
url:http://www.obeo.fr
version:2.1
end:vcard

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