Brian D Chambers created SPARK-23543:
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Summary: Automatic Module creation fails in Java 9
Key: SPARK-23543
URL: https://issues.apache.org/jira/browse/SPARK-23543
Project: Spark
Issue Type: Bug
Components: Build
Affects Versions: 2.3.0
Environment: maven + jdk9 + project based on jdk9 module system
Reporter: Brian D Chambers
When adding Spark to a Java 9 project that is utilizing the new jdk9 module
system, Spark components cannot be used because the automatic module names that
are generated by the jdk9 are based on the JAR. When the JAR has chars not
recognized by jdk9 as valid for identifiers (in this case, digits) at the start
of a part of the token, the jdk9 fails to autogenerate a module name.
This problem can also be validated/tested on the command line against any Spark
jar, e.g.
{panel:title=jar --file=spark-graphx_2.11-2.3.0.jar --describe-module}
Unable to derive module descriptor for: spark-graphx_2.11-2.3.0.jar
spark.graphx.2.11: Invalid module name: '2' is not a Java identifier
{panel}
Spark does not have to support jdk9 modules to fix this issue. It just needs
to add a line of metadata to its manifest so the jdk can generate a valid
automatic name.
the following would be sufficient to fix the issue in spark.graphx
{code:java}
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifestEntries>
<Automatic-Module-Name>spark.graphx</Automatic-Module-Name>
</manifestEntries>
</archive>
</configuration>
</plugin>
{code}
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