Josef Cacek created MNG-7511:
--------------------------------
Summary: Ensure the degreeOfConcurrency is a positive number in
MavenExecutionRequest
Key: MNG-7511
URL: https://issues.apache.org/jira/browse/MNG-7511
Project: Maven
Issue Type: Bug
Components: Core
Affects Versions: 3.8.6
Reporter: Josef Cacek
The {{degreeOfConcurrency}} should always be a positive number, otherwise
builds might fail.
In Hazelcast we build with threads set to {{-T 0.5C}} in
[{{.mvn/maven.config}}|https://github.com/hazelcast/hazelcast/blob/v5.1.2/.mvn/maven.config].
This is fine until we run the build on a single CPU machine. It fails then with
{{IllegalArgumentException}} as the computed {{degreeOfConcurrency == 0}}.
Stacktrace from Maven 3.6.3:
{code}
[ERROR] IllegalArgumentException
java.lang.IllegalArgumentException
at java.util.concurrent.ThreadPoolExecutor.<init>
(ThreadPoolExecutor.java:1293)
at java.util.concurrent.ThreadPoolExecutor.<init>
(ThreadPoolExecutor.java:1215)
at java.util.concurrent.Executors.newFixedThreadPool (Executors.java:155)
at
org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder.build
(MultiThreadedBuilder.java:88)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:566)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
(Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch
(Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
(Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main
(Launcher.java:347)
{code}
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