[jira] [Created] (SPARK-1437) Jenkins should build with Java 6

["Sean Owen (JIRA)" <ji...@apache.org>]

Sean Owen created SPARK-1437:
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             Summary: Jenkins should build with Java 6
                 Key: SPARK-1437
                 URL: https://issues.apache.org/jira/browse/SPARK-1437
             Project: Spark
          Issue Type: Bug
          Components: Build
    Affects Versions: 0.9.0
            Reporter: Sean Owen
            Priority: Minor


Apologies if this was already on someone's to-do list, but I wanted to track this, as it bit two commits in the last few weeks.

Spark is intended to work with Java 6, and so compiles with source/target 1.6. Java 7 can correctly enforce Java 6 language rules and emit Java 6 bytecode. However, unless otherwise configured with -bootclasspath, javac will use its own (Java 7) library classes. This means code that uses classes in Java 7 will be allowed to compile, but the result will fail when run on Java 6.

This is why you get warnings like ...

Using /usr/java/jdk1.7.0_51 as default JAVA_HOME.
...
[warn] warning: [options] bootstrap class path not set in conjunction with -source 1.6

The solution is just to tell Jenkins to use Java 6. This may be stating the obvious, but it should just be a setting under "Configure" for SparkPullRequestBuilder. In our Jenkinses, JDK 6/7/8 are set up; if it's not an option already I'm guessing it's not too hard to get Java 6 configured on the Amplab machines.



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