[jira] [Created] (GROOVY-7749) Cannot using maven shading because of Extension Modules Check

["Marc Hadfield (JIRA)" <ji...@apache.org>]

Marc Hadfield created GROOVY-7749:
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             Summary: Cannot using maven shading because of Extension Modules Check
                 Key: GROOVY-7749
                 URL: https://issues.apache.org/jira/browse/GROOVY-7749
             Project: Groovy
          Issue Type: Bug
          Components: groovy-runtime
    Affects Versions: 2.4.5
            Reporter: Marc Hadfield



groovy checks at init time whether there is another groovy on the classpath, and exits with an error if so.

this prevents using maven shading (and similar techniques) to combine multiple versions of jars into a single distribution.

the specific exception thrown comes from here:
https://github.com/apache/groovy/blob/master/src/main/org/codehaus/groovy/runtime/metaclass/MetaClassRegistryImpl.java#L511

this problem occurs often in Hadoop and Spark jobs where multiple versions of Groovy may appear.  Specifically in Apache Spark 1.6.0, groovy 2.1.6 is embedded.

A solution would require modifications to how the scans for things like:
"META-INF/services/org.codehaus.groovy.runtime.ExtensionModule" work so that maven shading can merge multiple groovys together.






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