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https://issues.apache.org/jira/browse/MNG-4996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617182#comment-16617182
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Umberto Nicoletti commented on MNG-4996:
----------------------------------------
Hoping this helps future readers: in our case we add a module which installed
some local jars into the repository. We have tried moving that module out of
the install phase and so far it seems to have improved reliability. Fingers
crossed
> Maven3 parallel build fails occasionally for classpath problems.
> ----------------------------------------------------------------
>
> Key: MNG-4996
> URL: https://issues.apache.org/jira/browse/MNG-4996
> Project: Maven
> Issue Type: Bug
> Components: Plugins and Lifecycle
> Affects Versions: 3.0.1
> Environment: maven 3.0.1, maven 3.0
> Reporter: Kari J. Niemi
> Assignee: Kristian Rosenvold
> Priority: Major
>
> In a multimodule (>120 modules) maven build, the compiler plug-in would seem
> to fail in creating a correct class-path every now and then.
> Instead of this entry in maven -X logs for a single module build:
> ----
> [DEBUG] Configuring mojo
> 'org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile' with basic
> configurator -->
> ..
> [DEBUG] (f) classpathElements =
> [/home/karniemi/"mymodulepath"/target/classes,
> /home/karniemi/.m2/repository/org/apache/servicemix/servicemix-utils/1.2.0/servicemix-utils-1.2.0.jar,
>
> /home/karniemi/.m2/repository/org/apache/geronimo/specs/geronimo-stax-api_1.0_spec/1.0.1/geronimo-stax-api_1.0_spec-1.0.1.jar,
>
> /home/karniemi/.m2/repository/org/codehaus/woodstox/wstx-asl/3.2.6/wstx-asl-3.2.6.jar,
>
> /home/karniemi/.m2/repository/org/apache/servicemix/specs/org.apache.servicemix.specs.jbi-api-1.0/1.4.0/org.apache.servicemix.specs.jbi-api-1.0-1.4.0.jar,
>
> /home/karniemi/.m2/repository/org/apache/geronimo/specs/geronimo-activation_1.1_spec/1.0.2/geronimo-activation_1.1_spec-1.0.2.jar,
> /home/karniemi/.m2/repository/log4j/log4j/1.2.14/log4j-1.2.14.jar]
> ----
> every now and then I get this in the parallel build:
> ----
> [DEBUG] Configuring mojo
> 'org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile' with basic
> configurator -->
> ...
> [DEBUG] (f) classpathElements =
> [/home/karniemi/"mymodulepath"/target/classes]
> ----
> And of course the compilation fails because none of the dependencies are
> added to the classpath. Sometimes it goes fine in the multi-module build, but
> every now and then it fails for this.
> In both maven runs I can see that the dependencies are resolved fine:
> ----------
> [DEBUG] "mymodule":jar:DYNAMIC-SNAPSHOT
> [DEBUG] junit:junit:jar:4.7:test
> [DEBUG] org.apache.servicemix:servicemix-utils:jar:1.2.0:provided
> [DEBUG]
> org.apache.geronimo.specs:geronimo-stax-api_1.0_spec:jar:1.0.1:provided
> [DEBUG] org.codehaus.woodstox:wstx-asl:jar:3.2.6:provided
> [DEBUG]
> org.apache.servicemix.specs:org.apache.servicemix.specs.jbi-api-1.0:jar:1.4.0:provided
> (scope managed from compile) (version managed from 1.1.0)
> [DEBUG]
> org.apache.geronimo.specs:geronimo-activation_1.1_spec:jar:1.0.2:provided
> [DEBUG] log4j:log4j:jar:1.2.14:provided
> -----------
>
> The pluginArtifactMap looks like this:
> --------------------
> [DEBUG] (s) pluginArtifactMap =
> {org.apache.maven.plugins:maven-surefire-plugin=org.apache.maven.plugins:maven-surefire-plugin:maven-plugin:2.6:,
>
> org.apache.maven.surefire:surefire-booter=org.apache.maven.surefire:surefire-booter:jar:2.6:compile,
>
> org.apache.maven.surefire:surefire-api=org.apache.maven.surefire:surefire-api:jar:2.6:compile,
>
> org.apache.maven.surefire:maven-surefire-common=org.apache.maven.surefire:maven-surefire-common:jar:2.6:compile,
>
> org.apache.maven.shared:maven-common-artifact-filters=org.apache.maven.shared:maven-common-artifact-filters:jar:1.2:compile,
>
> org.codehaus.plexus:plexus-utils=org.codehaus.plexus:plexus-utils:jar:2.0.5:compile,
> junit:junit=junit:junit:jar:3.8.1:compile,
> org.apache.maven.reporting:maven-reporting-api=org.apache.maven.reporting:maven-reporting-api:jar:2.0.9:compile}
> --------------------
> I'm really using jbi-maven-plugin for most of the modules, and that plugin
> binds the other plugins -also the compiler-plugin -to maven life-cycle phases.
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