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https://issues.apache.org/jira/browse/MPLUGIN-320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15767988#comment-15767988
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Guillaume Boué commented on MPLUGIN-320:
----------------------------------------
This is an issue with the downstream qdox library that the plugin is using. I
created an issue https://github.com/paul-hammant/qdox/issues/15 to track this.
> 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/example/src/main/java/com/example/plugin/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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