I want to produce a Java 8 compatible library that provides some Java 9+
classes, packaged as a Multi-Release JAR:
* https://maven.apache.org/plugins/maven-compiler-plugin/multirelease.html
I've taken a slimmed down _Multi-Release Parent_
<http://www.russgold.net/sw/2018/04/easier-than-it-looks/> approach, and
the main compilation and packaging seems just right:
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.10.1</version>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
<executions>
<execution>
<id>compile-java9</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<release>9</release>
<jdkToolchain>
<version>9</version>
</jdkToolchain>
<compileSourceRoots>
<compileSourceRoot>${project.basedir}/src/main/java9</compileSourceRoot>
</compileSourceRoots>
<multiReleaseOutput>true</multiReleaseOutput>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.2.2</version>
<configuration>
<archive>
<manifestEntries>
<Multi-Release>true</Multi-Release>
</manifestEntries>
</archive>
</configuration>
</plugin>
Now I've added some test sources exercising the Java 9+ only classes,
but the `testCompile` goal seems unable to find them. Is it possible to
configure the `default-testCompile` execution to see the classes from
the `multiReleaseOutput` of the main compile?
FWIW, my current work-in-progress could be seen at:
* https://github.com/stanio/xbrz-java/commit/8c9564ee874
--
Stanimir
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