[SUREFIRE-1147] Unbounded memory usage when running MANY tests

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.18.1
• Fix Version/s: Backlog
• Component/s: Maven Surefire Plugin
• Environment: win7, jdk 8u25, mvn 3.2.5
• Flags: Patch
• Assignee: Tibor Digana
• Reporter: Laurent Claisse
• Created: 08/Mar/15 16:37
• Updated: 10/Feb/22 01:25

Description

I'm writing concurrency tests, checking that this thing is reproducible, that other thing isn't, and so on. So i repeat tests MANY times like 100_000 (to reproduce the leak, the test project is here: https://github.com/vandekeiser/parallel-stream-fork-join-pool)

I see in VisualVM that the culprit is WrappedReportEntry, which indirectly holds references to lots of byte[] and char[] (allocation traces and heap dump pics are included in attachment)

I forked and patched maven-surefire-common, and that makes the leak go. I had to replace WrappedReportEntry.original by a singleton fake ReportEntry.
Bebefore that i had replaced Utf8RecodingDeferredFileOutputStream.deferredFileOutputStream by a NullOutputStream and the leak was lesser but still here.

My fork of maven-surefire-common is there: https://github.com/vandekeiser/maven-surefire/tree/master/maven-surefire-common.
It IS a patch so i checked the patch checkbox in the issue reporter, but it is NOT intended to be distributed of course since it is very brutal and basic.

Also in my test project i explicitly deactivated reporting, but that doesn't make the reporting leak go away at all:
<disableXmlReport>true</disableXmlReport>
<printSummary>false</printSummary>