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https://issues.apache.org/jira/browse/MJLINK-4?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16392183#comment-16392183
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Bernd Eckenfels commented on MJLINK-4:
--------------------------------------
Just as an additional note, I had the same issue in alpha.1 and I noticed that
using the POM parent `com.soebes.smpp:smpp:2.3.0` would work around it. I guess
it updates some shared components or adds something to the model. Anyway..
waiting for alpha.2 :)
> NPE on execution
> -----------------
>
> Key: MJLINK-4
> URL: https://issues.apache.org/jira/browse/MJLINK-4
> Project: Maven JLink Plugin
> Issue Type: Bug
> Affects Versions: 3.0.0-alpha-1
> Environment: Ubuntu 16.04.3 LTS
> Linux 4.4.0-93-generic
> Reporter: Johannes Boesl
> Assignee: Robert Scholte
> Priority: Major
> Fix For: 3.0.0-alpha-2
>
>
> When I try to run my maven build I get the following exception:
> {noformat}[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}
> {noformat}
> 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() );}}
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