[jira] (MNG-5750) Sporadic failures in concurrent build

["Alexander Ashitkin (JIRA)" <ji...@codehaus.org>]

Alexander Ashitkin created MNG-5750:
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             Summary: Sporadic failures in concurrent build
                 Key: MNG-5750
                 URL: https://jira.codehaus.org/browse/MNG-5750
             Project: Maven
          Issue Type: Bug
          Components: General
    Affects Versions: 3.2.5, 3.2.2, 3.2.1, 3.1.1
         Environment: SLES 3.0.80-0.7-default SMP x86_64 GNU/Linux Oracle HotSpot JDK 7u25
windows server 2008 x64 Oracle HotSpot JDK 7u65/8u25
            Reporter: Alexander Ashitkin
            Priority: Critical


We have a large project of 300+ modules which regularly fails with different kind of classloading issues in different places. The issue is reliably reproduced only with parallel build and is not happens in single threaded. The optimal concurrency level for our project ~10 threads. At this level ~%20 of builds fail. To workaround the issue we reduced concurrency to 4 in development builds and reverted production build to 1 thread.

Main point of failures:
# Surefire ClassNotFound. Reported and investigated in SUREFIRE-1132. Points to a problem with MavenProject#getArtifacts - empty set unexpectedly returned.
# unexpected compilation failures because of incorrect classpath (lterally all dependencies are not on the classpath), like: {code}
20:20:54 [ERROR] /D:/jenkins/work/workspace/..Request.java:[3,30] package ... does not exist
20:20:54 [ERROR] /D:/jenkins/work/workspace/..Request.java:[4,30] package ... does not exist
20:20:54 [ERROR] /D:/jenkins/work/workspace/..Request.java:[8,25] package ... does not exist
20:20:54 [ERROR] /D:/jenkins/work/workspace/..Request.java:[9,21] package org.joda.time does not exist
20:20:54 [ERROR] /D:/jenkins/work/workspace/..Request.java:[11,37] package com.google.common.base does not exist
20:20:54 [ERROR] /D:/jenkins/work/workspace/..Request.java:[11,1] static import only from classes and interfaces
20:20:54 [ERROR] /D:/jenkins/work/workspace/..Request.java:[12,37] package com.google.common.base does not exist
20:20:54 [ERROR] /D:/jenkins/work/workspace/..Request.java:[12,1] static import only from classes and interfaces
{code}
# unexpected NPE in archiver plugins, eg jar, assembly. Reported with stack traces in MJAR-192

At this point the issue looks like problem with MavenProject#getArtifacts in concurrent builds.

To help with the issue im happy to implement or evaluate any custom assembly to trace this down. Unfortunately i cannot submit my project - it is proprietary.

Thanks in advance, Alexander



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