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javamaveneclipselinkmaven-3tycho

How to build EclipseLink 2.7.0

I downloaded eclipselink from here https://github.com/eclipse/eclipselink.runtime. There are a lot of subprojects in it. Some of them can be built using maven, some with ant and some with gradle.

However, org.eclipse.persistence.core which I want to build is maven project. But when I try to build it (either parent project) I get exception:

Scanning for projects...
Computing target platform for MavenProject: org.eclipse.persistence:org.eclipse.persistence.jpa.jpql:2.7.0-SNAPSHOT @ /home/TEMP/eclipselink.runtime-master/jpa/org.eclipse.persistence.jpa.jpql/pom.xml
Fetching p2.index from http://download.eclipse.org/tools/orbit/downloads/drops/R20130827064939/repository/ (0B at 0B/s)
Adding repository http://download.eclipse.org/tools/orbit/downloads/drops/R20130827064939/repository
Fetching p2.index from http://download.eclipse.org/releases/luna/ (0B at 0B/s)
Adding repository http://download.eclipse.org/releases/luna
Fetching p2.index from http://download.eclipse.org/releases/luna/201406250900/ (0B at 0B/s)
Fetching p2.index from http://download.eclipse.org/releases/luna/201409261001/ (0B at 0B/s)
Fetching p2.index from http://download.eclipse.org/releases/luna/201501121000/ (0B at 0B/s)
Fetching p2.index from http://download.eclipse.org/releases/luna/201502271000/ (0B at 0B/s)
Resolving dependencies of MavenProject: org.eclipse.persistence:org.eclipse.persistence.jpa.jpql:2.7.0-SNAPSHOT @ /home/TEMP/eclipselink.runtime-master/jpa/org.eclipse.persistence.jpa.jpql/pom.xml
Resolving class path of MavenProject: org.eclipse.persistence:org.eclipse.persistence.jpa.jpql:2.7.0-SNAPSHOT @ /home/TEMP/eclipselink.runtime-master/jpa/org.eclipse.persistence.jpa.jpql/pom.xml
Computing target platform for MavenProject: org.eclipse.persistence:org.eclipse.persistence.core:2.7.0-SNAPSHOT @ /home/TEMP/eclipselink.runtime-master/foundation/org.eclipse.persistence.core/pom.xml
Resolving dependencies of MavenProject: org.eclipse.persistence:org.eclipse.persistence.core:2.7.0-SNAPSHOT @ /home/TEMP/eclipselink.runtime-master/foundation/org.eclipse.persistence.core/pom.xml
{osgi.os=linux, osgi.ws=gtk, org.eclipse.update.install.features=true, osgi.arch=x86_64}
Cannot resolve project dependencies:
  Software being installed: org.eclipse.persistence.core 2.7.0.qualifier
  Missing requirement: org.eclipse.persistence.core 2.7.0.qualifier requires 'bundle org.eclipse.persistence.antlr 3.5.2' but it could not be found

See http://wiki.eclipse.org/Tycho/Dependency_Resolution_Troubleshooting for help.
Cannot resolve dependencies of MavenProject: org.eclipse.persistence:org.eclipse.persistence.core:2.7.0-SNAPSHOT @ /home/TEMP/eclipselink.runtime-master/foundation/org.eclipse.persistence.core/pom.xml: See log for details -> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles: 
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MavenExecutionException

The jar org.eclipse.persistence.antlr 3.5.2 is already in zip I downloaded and there are besides sources of it, which can be built using ant.
And I could add this jar as dependency but I don't think this is the right way - because there are a lot of jars inside this zip file.

Question: how to build it?

Solution

  • Indeed the pom.xml files are misleading, these projects are not Maven projects or - at least - are not meant to be built directly via maven. The whole build is an ant build which makes uses of Maven as a supporting tool because of the need of using Tycho integration.

    Looking at the antbuild.xml ant build file, you would see it is invoking Maven via its Java main class (Maven is built in Java and the entry point is an old plain Java main after all): org.codehaus.plexus.classworlds.launcher.Launcher, in its build-core target.

    So the workflow is:

    • Start an ant build, from the root folder, invoking ant -f antbuild.xml
    • Ant will then invoke Maven builds as nested builds
    • Nested Maven builds are on multi-module/aggregator projects, which in turn will build several Maven modules (sub-projects), starting form the root/parent Maven pom.xml located under buildsystem/org.eclipse.persistence.parent

    Note you would need to have:

    • Maven 3 to build it, as a prerequisites of the aforementioned parent pom file.
    • the M2_HOME env variable set, pointing at your maven installation folder
    • Use Ant 1.9+

    However, as part of the minimal set-up, the default build would not run properly (successfully), because of junit missing library, as specified by the echo statement below:

    [echo] junit.lib = '${junit.lib}' (if not set tests may not compile; let alone run)

    Hence, the minimal invocation would be:

    ant -f antbuild.xml -Djunit.lib=<path_to_junit_jar>

    For instance, you could directly point to your maven repository as following (which worked for me):

    ant -f antbuild.xml -DC:\data\m2\repository\junit\junit\4.12\junit-4.12.jar

    alternatively, you can specify the path in the antbuild.properties file, here:

    # The directory that holds the oracle-specific jar files.   
# You can either put the jars in this directory, or specify your own directory.   
junit.lib=../extension.lib.external/junit.jar

    The same should also be made for jmockit, otherwise causing some compilation errors, althought not affecting a successful build.

    The jmockit.jar property can be set in the antbuild.properties file of the eclipse.moxy.test module, here:

    #JMockit   
jmockit.jar=jmockit-1.10.jar

    Or, again, via command line as per the following example:

    ant -f antbuild.xml -Djunit.lib=C:\data\m2\repository\junit\junit\4.12\junit-4.12.jar -Djmockit.jar=C:\data\m2\repository\org\jmockit\jmockit\1.10\jmockit-1.10.jar

    The command above gave me a successful build, no compilation errors at all. Only warnings were present concerning usage of deprecated or internal API.