Falko Modler created MNG-7335:
---------------------------------
Summary: [Regression] Parallel build fails due to missing JAR
artifacts in compilePath
Key: MNG-7335
URL: https://issues.apache.org/jira/browse/MNG-7335
Project: Maven
Issue Type: Bug
Components: Core
Affects Versions: 3.6.3
Environment: - Linux (tested Docker using maven:3-jdk-8 tag): happens
most times.
- Windows 10: happens sometimes.
Reporter: Falko Modler
Assignee: Robert Scholte
Fix For: 3.8.2, 4.0.0, 4.0.0-alpha-1
Build of our multi module (57) Java maven project is failing phase when running
it as parallel in 4 threads (mvn -T 4 clean install). The failure happens
during compilation because packages/classes from compile dependencies cannot be
found:
{noformat}
[main] [ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile)
on project common: Compilation failure: Compilation failure:
[main] [ERROR]
/home/common/src/main/java/com/foo/ZonedDateTimeParser.java:[6,32] package
org.apache.commons.lang3 does not exist{noformat}
After enabling debug logging (with thread names) I have found out that a
compile path of the failing module is empty (besides target/classes):
When running in 4 threads (-T 4):
{noformat}
[BuilderThread 2] [DEBUG] (f) compilePath = [/home/common/target/classes]
...
[BuilderThread 2] [DEBUG] Command line options:
[BuilderThread 2] [DEBUG] -d /home/common/target/classes -classpath
/home/common/target/classes: -sourcepath
/home/common/src/main/java:/home/common/target/generated-sources/annotations:
-s /home/common/target/generated-sources/annotations -g -nowarn -target 1.8
-source 1.8 -encoding UTF-8{noformat}
When running in a single thread (-T 1):
{noformat}
[BuilderThread 0] [DEBUG] (f) compilePath = [/home/common/target/classes,
/root/.m2/repository/commons-beanutils/commons-beanutils/1.9.3/commons-beanutils-1.9.3.jar,
/root/.m2/repository/commons-collections/commons-collections/3.2.2/commons-collections-3.2.2.jar,
/root/.m2/repository/org/apache/commons/commons-collections4/4.3/commons-collections4-4.3.jar,
/root/.m2/repository/org/apache/commons/commons-lang3/3.9/commons-lang3-3.9.jar,
/root/.m2/repository/org/jooq/jool-java-8/0.9.14/jool-java-8-0.9.14.jar,
/root/.m2/repository/org/slf4j/slf4j-api/1.7.26/slf4j-api-1.7.26.jar,
/root/.m2/repository/org/springframework/spring-beans/5.1.8.RELEASE/spring-beans-5.1.8.RELEASE.jar,
/root/.m2/repository/org/springframework/spring-core/5.1.8.RELEASE/spring-core-5.1.8.RELEASE.jar,
/root/.m2/repository/org/springframework/spring-context/5.1.8.RELEASE/spring-context-5.1.8.RELEASE.jar]
...
[BuilderThread 0] [DEBUG] Command line options:
[BuilderThread 0] [DEBUG] -d /home/common/target/classes -classpath
/home/common/target/classes:/root/.m2/repository/commons-beanutils/commons-beanutils/1.9.3/commons-beanutils-1.9.3.jar:/root/.m2/repository/commons-collections/commons-collections/3.2.2/commons-collections-3.2.2.jar:/root/.m2/repository/org/apache/commons/commons-collections4/4.3/commons-collections4-4.3.jar:/root/.m2/repository/org/apache/commons/commons-lang3/3.9/commons-lang3-3.9.jar:/root/.m2/repository/org/jooq/jool-java-8/0.9.14/jool-java-8-0.9.14.jar:/root/.m2/repository/org/slf4j/slf4j-api/1.7.26/slf4j-api-1.7.26.jar:/root/.m2/repository/org/springframework/spring-beans/5.1.8.RELEASE/spring-beans-5.1.8.RELEASE.jar:/root/.m2/repository/org/springframework/spring-core/5.1.8.RELEASE/spring-core-5.1.8.RELEASE.jar:/root/.m2/repository/org/springframework/spring-context/5.1.8.RELEASE/spring-context-5.1.8.RELEASE.jar:
-sourcepath
/home/common/src/main/java:/home/common/target/generated-sources/annotations:
-s /home/common/target/generated-sources/annotations -g -nowarn -target 1.8
-source 1.8 -encoding UTF-8{noformat}
After adding custom log messages I have found out that the root cause is that
org.apache.maven.project.MavenProject.setArtifactFilter() is called with null
artifactFilter parameter. The call happens for the failing module from a thread
that is building another module. The call stack is:
{code:java}
"BuilderThread 0@2513" prio=5 tid=0xe nid=NA runnable
java.lang.Thread.State: RUNNABLE
at
org.apache.maven.project.MavenProject.setArtifactFilter(MavenProject.java:1437)
at
org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved(MojoExecutor.java:279)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:202)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:156)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
at
org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:190)
at
org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:186)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748){code}
The MavenProject objects are shared among all build threads via MavenSession -
member {{org.apache.maven.execution.MavenSession#projects}}.
As all the MavenSession objects are created by cloning an initial MavenSession
object, I have added cloning of projects into the MavenSession clone() method.
With this change the build succeeded:
{code:java}
@Override
public MavenSession clone()
{
try
{
MavenSession thisClone = (MavenSession) super.clone();
thisClone.setProjects(getProjectsClone());
return thisClone;
}
catch ( CloneNotSupportedException e )
{
throw new RuntimeException( "Bug", e );
}
}
private synchronized List<MavenProject> getProjectsClone()
{
if (projects == null) {
return null;
} else {
if (projects.isEmpty()) {
return Collections.emptyList();
} else {
List<MavenProject> clonedProjects = new
ArrayList<>(projects.size());
for (MavenProject project : projects) {
clonedProjects.add(project.clone());
} return clonedProjects;
}
}
}
{code}
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