Issues with Clover on maven parallel builds

[nathan_janken_veeva]

Does Clover support parallel builds for maven?  This is clover 4.1.1 (I just downloaded it today) and maven version info is:

mvn -version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T08:41:47-08:00)
Maven home: /usr/local/Cellar/maven/3.3.9/libexec
Java version: 1.8.0_74, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_74.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.11.3", arch: "x86_64", family: "mac"

If I do: mvn -T 1C clean clover:setup test clover:aggregate clover:clover

I get various issues depending on the run such as:

• Failed to execute goal com.atlassian.maven.plugins:clover-maven-plugin:4.1.1:setup (default-cli) on project woozle: Execution default-cli of goal com.atlassian.maven.plugins:clover-maven-plugin:4.1.1:setup failed. ConcurrentModificationException

• Failed to execute goal com.atlassian.maven.plugins:clover-maven-plugin:4.1.1:setup (default-cli) on project woozle: Execution default-cli of goal com.atlassian.maven.plugins:clover-maven-plugin:4.1.1:setup failed. ArrayIndexOutOfBoundsException

  
   

A little more info with the maven debug flag turned on:

[ERROR] Failed to execute goal com.atlassian.maven.plugins:clover-maven-plugin:4.1.1:setup (default-cli) on project woozle: Execution default-cli of goal com.atlassian.maven.plugins:clover-maven-plugin:4.1.1:setup failed: 3 -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.atlassian.maven.plugins:clover-maven-plugin:4.1.1:setup (default-cli) on project woozle: Execution default-cli of goal com.atlassian.maven.plugins:clover-maven-plugin:4.1.1:setup failed: 3
 at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
 at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
 at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
 at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
 at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:185)
 at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:181)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal com.atlassian.maven.plugins:clover-maven-plugin:4.1.1:setup failed: 3
 at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
 at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
 ... 11 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 3
 at java.util.ArrayList.add(ArrayList.java:459)
 at org.apache.maven.model.BuildBase.addResource(BuildBase.java:94)
 at org.apache.maven.project.MavenProject.addResource(MavenProject.java:663)
 at com.atlassian.maven.plugin.clover.CloverInstrumentInternalMojo.injectGrover(CloverInstrumentInternalMojo.java:374)
 at com.atlassian.maven.plugin.clover.CloverInstrumentInternalMojo.execute(CloverInstrumentInternalMojo.java:311)
 at com.atlassian.maven.plugin.clover.CloverSetupMojo.execute(CloverSetupMojo.java:31)
 at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
 ... 12 more

[Marek Parfianowicz]

Hi Nathan,

Clover does not support parallel compilation. So you can not use any of:

• parallel build option in Maven,
• <parallel> task in Ant or
• parallel build in IDEA 12+ (Settings > Build > Compiler)

There are few technical issues which are blockers now:

• locking the same database file by multiple threads/processes
• parallel writing to the same database file
• tracking per-test code coverage for tests executing in parallel

References:

• https://confluence.atlassian.com/display/CLOVER/clover-setupTroubleshooting chapter
• https://jira.atlassian.com/browse/CLOV-1284
• https://jira.atlassian.com/browse/CLOV-418