[jira] [Created] (SPARK-8762) Maven build fails if the project is in a symlinked folder

["Roman Zenka (JIRA)" <ji...@apache.org>]

Roman Zenka created SPARK-8762:
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             Summary: Maven build fails if the project is in a symlinked folder
                 Key: SPARK-8762
                 URL: https://issues.apache.org/jira/browse/SPARK-8762
             Project: Spark
          Issue Type: Bug
          Components: Build
    Affects Versions: 1.4.0
         Environment: CentOS, Java 1.7, Maven 3.3.3
            Reporter: Roman Zenka
            Priority: Minor


Build was failing mysteriously in spark-core module with following error:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.3:compile (default-compile) on project spark-core_2.10: Compilation failure: Compilation failure:
[ERROR] /mnt/jenkins/var/lib/jenkins/jobs/apache.spark/workspace/core/src/main/scala/org/apache/spark/annotation/DeveloperApi.java:[35,8] error: duplicate class: org.apache.spark.annotation.DeveloperApi
[ERROR] /mnt/jenkins/var/lib/jenkins/jobs/apache.spark/workspace/core/src/main/scala/org/apache/spark/annotation/Experimental.java:[36,8] error: duplicate class: org.apache.spark.annotation.Experimental
[ERROR] /var/lib/jenkins/jobs/apache.spark/workspace/core/src/main/scala/org/apache/spark/annotation/AlphaComponent.java:[33,8] error: duplicate class: org.apache.spark.annotation.AlphaComponent
[ERROR] /var/lib/jenkins/jobs/apache.spark/workspace/core/src/main/scala/org/apache/spark/annotation/Private.java:[41,8] error: duplicate class: org.apache.spark.annotation.Private
[ERROR] -> [Help 1]

The /var/lib/jenkins folder is actually a symlink to /mnt/jenkins/var/lib/jenkins. This confuses the compiler that seems to resolve some paths and keep others intact, which leads to the same class appearing "twice" during the compilation.

The workaround is to always point the build to the physical folder, never build through a symlink. I have not determined the precise source of the error, but it is likely inside Maven.

The fix could be as easy as mentioning that this issue exists in the FAQ so others running into it can fix it instantly.



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