[MJLINK-4] NPE on execution

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha-1
• Fix Version/s: 3.0.0
• Environment: Ubuntu 16.04.3 LTS; Linux 4.4.0-93-generic
• Assignee: Robert Scholte
• Reporter: Johannes Boesl
• Created: 18/Sep/17 07:51
• Updated: 29/Nov/20 11:15
• Resolved: 15/Oct/17 21:20

Description

When I try to run my maven build I get the following exception:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-jlink-plugin:3.0.0-alpha-1:jlink (default-jlink) on project jloadr-jre: Execution default-jlink of goal org.apache.maven.plugins:maven-jlink-plugin:3.0.0-alpha-1:jlink failed.: NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-jlink-plugin:3.0.0-alpha-1:jlink (default-jlink) on project jloadr-jre: Execution default-jlink of goal org.apache.maven.plugins:maven-jlink-plugin:3.0.0-alpha-1:jlink failed.
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
	at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:200)
	at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:196)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-jlink of goal org.apache.maven.plugins:maven-jlink-plugin:3.0.0-alpha-1:jlink failed.
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
	... 11 more
Caused by: java.lang.NullPointerException
	at org.codehaus.plexus.languages.java.jpms.ResolvePathsRequest$1.toPath(ResolvePathsRequest.java:52)
	at org.codehaus.plexus.languages.java.jpms.ResolvePathsRequest$1.toPath(ResolvePathsRequest.java:48)
	at org.codehaus.plexus.languages.java.jpms.LocationManager.resolvePaths(LocationManager.java:109)
	at org.apache.maven.plugins.jlink.JLinkMojo.preparePaths(JLinkMojo.java:347)
	at org.apache.maven.plugins.jlink.JLinkMojo.execute(JLinkMojo.java:264)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	... 12 more{quote}

The cause seems to be that the following code in line 337 in JLinkMojo returns a collection with only 'null' entries:
Collection<File> dependencyArtifacts = getCompileClasspathElements( getProject() );

Issue Links

• is duplicated by: MJLINK-42 NullPointerException when running jlink:jlink
• links to: GitHub Pull Request #133