[MNG-5965] Parallel build multiplies work if multiple goals are given

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.9
• Fix Version/s: 3.6.1
• Component/s: Bootstrap & Build
• Environment: Windows 7 64bit
• Assignee: Michael Osipov
• Reporter: Matthias Schmalz
• Created: 22/Jan/16 15:51
• Updated: 28/Mar/20 15:03
• Resolved: 27/Dec/18 13:14

Description

When I run a parallel build which invokes multiple goals Maven multiplies the work e.g. when I run

install sonar:sonar
Every phase is executed once as expected. However when I run

install sonar:sonar -T 4
Every phase is executed twice.

The problem can be reproduced with a single simple Java project (of course parallel builds are useless with a single module). Debugging showed that every Mojo is really called twice per project.
Find attached a simple project and two build outputs, where you can see that the parallel build is doing everything twice (you can ignore that Sonar fails in the end, due to no server is up).

Issue Links

• is depended upon by: MNG-5705 NPE on parallel build in BuilderCommon.handleBuildError(BuilderCommon.java:147)
• is related to: MNG-5705 NPE on parallel build in BuilderCommon.handleBuildError(BuilderCommon.java:147)
• links to: GitHub Pull Request #22
• links to: GitHub Pull Request #22
• links to: GitHub Pull Request #125
• links to: GitHub Pull Request #125