[jira] [Created] (MPLUGIN-320) JavaJavadocMojoDescriptorExtractor fails with Java 8 lambdas.

["Antony Riley (JIRA)" <ji...@apache.org>]

Antony Riley created MPLUGIN-320:
------------------------------------

             Summary: JavaJavadocMojoDescriptorExtractor fails with Java 8 lambdas.
                 Key: MPLUGIN-320
                 URL: https://issues.apache.org/jira/browse/MPLUGIN-320
             Project: Maven Plugin Tools
          Issue Type: Bug
          Components: maven-plugin-tools-java
    Affects Versions: 3.5
            Reporter: Antony Riley
            Priority: Minor


JavaJavadocMojoDescriptorExtractor fails to parse the following source:

{code:java}
package com.example.plugin;

import com.amazonaws.AmazonWebServiceClient;
import com.amazonaws.services.ecr.AmazonECRClient;
import com.amazonaws.services.ecs.AmazonECSClient;

import java.util.function.Supplier;

public enum AmazonClients {
    ECS(AmazonECSClient::new),
    ECR(AmazonECRClient::new);

    private final Supplier<? extends AmazonWebServiceClient> supplier;

    <T extends AmazonWebServiceClient> AmazonClients(Supplier<T> supplier) {
        this.supplier = new SingletonSupplier<T>(supplier);
    }

    public <T extends AmazonWebServiceClient> T get() {
        return (T) supplier.get();
    }

    private static class SingletonSupplier<T> implements Supplier<T> {
        private final Supplier<T> realSupplier;
        private T instance;

        private SingletonSupplier(Supplier<T> realSupplier) {
            this.realSupplier = realSupplier;
        }

        @Override
        public synchronized T get() {
            return instance == null ? instance = realSupplier.get() : instance;
        }
    }
}
{code}

It fails on the lamdas in the constructors, this causes maven-plugin-plugin:helpmojo to fail with the following exception:

{noformat}
Caused by: com.thoughtworks.qdox.parser.ParseException: syntax error @[10,24] in file:/home/antony/work/meter-download-site-v2/ecs-deploy-maven-plugin/src/main/java/com/vertoanalytics/meterdownloadsite/maven/AmazonClients.java
        at com.thoughtworks.qdox.parser.impl.Parser.yyerror(Parser.java:1739)
        at com.thoughtworks.qdox.parser.impl.Parser.yyparse(Parser.java:1861)
        at com.thoughtworks.qdox.parser.impl.Parser.parse(Parser.java:1720)
        at com.thoughtworks.qdox.library.SourceLibrary.parse(SourceLibrary.java:232)
        at com.thoughtworks.qdox.library.SourceLibrary.parse(SourceLibrary.java:209)
        at com.thoughtworks.qdox.library.SourceLibrary.addSource(SourceLibrary.java:157)
        at com.thoughtworks.qdox.library.SortedClassLibraryBuilder.addSource(SortedClassLibraryBuilder.java:173)
        at com.thoughtworks.qdox.JavaProjectBuilder.addSource(JavaProjectBuilder.java:151)
        at com.thoughtworks.qdox.JavaProjectBuilder$2.visitFile(JavaProjectBuilder.java:223)
        at com.thoughtworks.qdox.directorywalker.DirectoryScanner.walk(DirectoryScanner.java:103)
        at com.thoughtworks.qdox.directorywalker.DirectoryScanner.walk(DirectoryScanner.java:91)
        at com.thoughtworks.qdox.directorywalker.DirectoryScanner.walk(DirectoryScanner.java:91)
        at com.thoughtworks.qdox.directorywalker.DirectoryScanner.walk(DirectoryScanner.java:91)
        at com.thoughtworks.qdox.directorywalker.DirectoryScanner.walk(DirectoryScanner.java:91)
        at com.thoughtworks.qdox.directorywalker.DirectoryScanner.walk(DirectoryScanner.java:91)
        at com.thoughtworks.qdox.directorywalker.DirectoryScanner.scan(DirectoryScanner.java:81)
        at com.thoughtworks.qdox.JavaProjectBuilder.addSourceTree(JavaProjectBuilder.java:217)
        at com.thoughtworks.qdox.JavaProjectBuilder.addSourceTree(JavaProjectBuilder.java:204)
        at org.apache.maven.tools.plugin.extractor.javadoc.JavaJavadocMojoDescriptorExtractor.discoverClasses(JavaJavadocMojoDescriptorExtractor.java:625)
        at org.apache.maven.tools.plugin.extractor.javadoc.JavaJavadocMojoDescriptorExtractor.execute(JavaJavadocMojoDescriptorExtractor.java:573)
        at org.apache.maven.tools.plugin.scanner.DefaultMojoScanner.populatePluginDescriptor(DefaultMojoScanner.java:96)
        at org.apache.maven.plugin.plugin.AbstractGeneratorMojo.execute(AbstractGeneratorMojo.java:283)
        at org.apache.maven.plugin.plugin.HelpGeneratorMojo.execute(HelpGeneratorMojo.java:92)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
        ... 21 more
{noformat}



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