Is Maven ready for JDK9?

Question

Today I tried the latest jdk9 Build 113 and tried to compile my project with the latest Maven 3.3.9

These are the commands (found partially via twitter)

Answer 1

The Java doc plugin still have issues in the last version. (3.0.0.M1)

Answer 2

Update: should work without this workaround now.

The problem is already fixed from the plexus archiver team, but not yet released - thanks to Michael-O for pointing me to the right place :) !

Now there is a workaround posted from ctomc in PR 12 to use an old plexus archiver version 2.4.4.:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-assembly-plugin</artifactId>
    <version>2.4.1</version>                    
    <dependencies>
        <dependency>
            <groupId>org.codehaus.plexus</groupId>
            <artifactId>plexus-archiver</artifactId>
            <version>2.4.4</version>
        </dependency>
    </dependencies>
</plugin>
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <version>2.6</version>
    <dependencies>
        <dependency>
            <groupId>org.codehaus.plexus</groupId>
            <artifactId>plexus-archiver</artifactId>
            <version>2.4.4</version>
        </dependency>
    </dependencies>
</plugin>

Answer 3

Here is the answer from one Maven PMC member (me):

No, it is not. Robert Scholte is working on it. Jigsaw and other stuff introduced a lot of changes. There is no official timeframe where full compat (Maven + official plugins) will be given.

The issue you see is actually not Maven but Plexus Archiver. Refer to their GitHub page. If you think you can add value, contact maven-dev mailing list.

Progress documentation: https://cwiki.apache.org/confluence/display/MAVEN/Java+9+-+Jigsaw

Answer 4

I think maven is ready now, for me the following snippet is able to tell maven to use java 9 :

<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.7.0</version>
            <configuration>
                <source>9</source>
                <target>9</target>
            </configuration>
        </plugin>
    </plugins>
</build>

Answer 5

Yes, it is ready now. Still some things in progress, but generally usable. Check out a project of mine as example.

Answer 6

I had the same issue and the latest maven-javadoc-plugin that was published recently fixed it. Updated the dependency in the pom file to <version>3.0.0-M1</version>