[MNG-6930] Cannot use lambda as argument in a method in Mojo

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 3.6.0
• Component/s: Plugin API
• Assignee: Unassigned
• Reporter: Abel Salgado Romero
• Created: 31/May/20 20:39
• Updated: 28/Jun/20 10:09
• Resolved: 28/Jun/20 10:00

Description

I have a plugin with uses a component that receives a lambda as argument.

When passing any lamba, for example the following empty one

 

 
Optional<File> sourceDir = new SourceDirectoryLocator(sourceDirectory, project.getBasedir(), file -> {})
 .find();

 

 `maven-plugin-plugin` fails with the error:

 

 
[ERROR] Failed to execute goal org.codehaus.plexus:plexus-component-metadata:1.5.5:generate-metadata (default) on project asciidoctor-maven-plugin: Error generating metadata: : Failed to extract descriptors: Index 9578 out of bounds for length 999 -> [Help 1]

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.plexus:plexus-component-metadata:1.5.5:generate-metadata (default) on project asciidoctor-maven-plugin: Error generating metadata: 
 at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
 

 

 

Passing `null` or an anonymous class like shown below works however.

 

 
Optional<File> sourceDir = new SourceDirectoryLocator(sourceDirectory, project.getBasedir(),

 new Consumer<File>() {
 @Override
 public void accept(File file) {
 getLog().info("sourceDirectory " + file + " does not exist");
 }
 })
 .find();
 

 

 

Also tested with the current SNAPSHOT and the issue still happens

Here is the code to reprodude: https://github.com/abelsromero/asciidoctor-maven-plugin/tree/maven-plugin-plugin-lambda-issue . Just run `mvn clean test-compile` to see the error.