[jira] [Created] (MCOMPILER-445) Javac error on jdk16 build 18: invalid flag: -Xdoclint:-missing

["Benjamin Marwell (Jira)" <ji...@apache.org>]

Benjamin Marwell created MCOMPILER-445:
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             Summary: Javac error on jdk16 build 18: invalid flag: -Xdoclint:-missing
                 Key: MCOMPILER-445
                 URL: https://issues.apache.org/jira/browse/MCOMPILER-445
             Project: Maven Compiler Plugin
          Issue Type: Bug
    Affects Versions: 3.8.1, 3.8.0
         Environment: Maven 3.6.3
Compiler-Plugin 3.8.1
JDK16 since JDK 16 ea b 18
            Reporter: Benjamin Marwell
            Assignee: Benjamin Marwell


h2. Issue description

When compiling with options {{noFork}} and {{-Xdoclint}}, the compiler plugin will fail:

 
{quote}{{[INFO] ------------------------------------------------------------------------}}
{{[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (pre-compile-jute) on project zookeeper-jute: Fatal error compiling: error: invalid flag: -Xdoclint:-missing -> [Help 1]}}

{{This is Maven debug:}}
{{[DEBUG] Classpath:}}
{{[DEBUG] /home/eolivelli/dev/zookeeper/zookeeper-jute/target/classes}}
{{[DEBUG] /home/eolivelli/.m2/repository/org/apache/yetus/audience-annotations/0.5.0/audience-annotations-0.5.0.jar}}
{{[DEBUG] Source roots:}}
{{[DEBUG] /home/eolivelli/dev/zookeeper/zookeeper-jute/src/main/java}}
{{[DEBUG] /home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/java}}
{{[DEBUG] /home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/annotations}}
{{[DEBUG] Command line options:}}
{{[DEBUG] -d /home/eolivelli/dev/zookeeper/zookeeper-jute/target/classes -classpath /home/eolivelli/dev/zookeeper/zookeeper-jute/target/classes:/home/eolivelli/.m2/repository/org/apache/yetus/audience-annotations/0.5.0/audience-annotations-0.5.0.jar: -sourcepath /home/eolivelli/dev/zookeeper/zookeeper-jute/src/main/java:/home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/java:/home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/annotations: -s /home/eolivelli/dev/zookeeper/zookeeper-jute/target/generated-sources/annotations -g --release 8 -encoding UTF-8 -Werror -Xlint:deprecation -Xlint:unchecked -Xlint:-options -Xdoclint:-missing -Xpkginfo:always}}
{{[DEBUG] incrementalBuildHelper#beforeRebuildExecution}}
{{[INFO] Compiling 36 source files to /home/eolivelli/dev/zookeeper/zookeeper-jute/target/classes}}{quote}
But -Xdoclint is a valid option.
h2. Cause

Without forking, maven runs {{javac}} using {{com.sun.tools.javac.api.JavacTool}}. The module is not loaded.
h2. Proposed solution

From the mailing list:

When running the compiler in noFork mode, use the ToolProvider to run Javac in the same VM on Java9+. This can be implemented using multi-release-jars. See the {{maven-jlink-plugin}} as a reference.
h2. Related

[Move Doclint to jdk.javadoc module|https://bugs.openjdk.java.net/browse/JDK-8252712]



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