[jira] [Created] (MNG-7511) Ensure the degreeOfConcurrency is a positive number in MavenExecutionRequest

["Josef Cacek (Jira)" <ji...@apache.org>]

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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