[jira] [Created] (MASSEMBLY-887) Magically merged conflicting classpath

["Michał (JIRA)" <ji...@apache.org>]

Michał created MASSEMBLY-887:
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             Summary: Magically merged conflicting classpath 
                 Key: MASSEMBLY-887
                 URL: https://issues.apache.org/jira/browse/MASSEMBLY-887
             Project: Maven Assembly Plugin
          Issue Type: Bug
          Components: component descriptor
    Affects Versions: 3.1.0
            Reporter: Michał


I have found this issue, while migrating a project from Maven to SBT.

To describe the problem I have created an example project with dependencies that I found to behave differently, depending on the build tool.

[https://github.com/atais/mvn-sbt-assembly]

 

The only dependencies are (sbt style)
{code:java}
"com.netflix.astyanax" % "astyanax-cassandra" % "3.9.0", "org.apache.cassandra" % "cassandra-all" % "3.4",{code}
and what I do not understand is, why {{mvn package}} creates the fat jar successfully, while {{sbt assembly}} gives conflicts:
{code:java}
[error] 39 errors were encountered during merge [error] java.lang.RuntimeException: deduplicate: different file contents found in the following: [error] /home/siatkowskim/.ivy2/cache/org.slf4j/jcl-over-slf4j/jars/jcl-over-slf4j-1.7.7.jar:org/apache/commons/logging/<some classes> [error] /home/siatkowskim/.ivy2/cache/commons-logging/commons-logging/jars/commons-logging-1.1.1.jar:org/apache/commons/logging/<some classes> ... [error] /home/siatkowskim/.ivy2/cache/com.github.stephenc.high-scale-lib/high-scale-lib/jars/high-scale-lib-1.1.2.jar:org/cliffc/high_scale_lib/<some classes> [error] /home/siatkowskim/.ivy2/cache/com.boundary/high-scale-lib/jars/high-scale-lib-1.0.6.jar:org/cliffc/high_scale_lib/<some classes> ...{code}
*{{So I wonder, how come this plugin overcomes this conflicts?}}*

{{I have also created a SO question, if one would like to earn some points: [https://stackoverflow.com/questions/50249818/why-maven-assembly-works-when-sbt-assembly-find-conflicts]}}

{{ }}



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