maven-enforcer-plugin DependencyConvergence rule detecting convergence errors with Titan 1.0.0

[Tim Stewart]

Hi there!

I'm getting some convergence errors with Titan 1.0.0 and the maven-enforcer plugin.

Here is a bare-bones pom.xml. 

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.example</groupId>

  <artifactId>convergence</artifactId>

  <version>1.0.0-SNAPSHOT</version>

  <packaging>jar</packaging>

  <name>Convergence</name>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <titan.version>1.0.0</titan.version>

  </properties>

  <dependencies>

     <dependency>

      <groupId>com.thinkaurelius.titan</groupId>

      <artifactId>titan-core</artifactId>

      <version>${titan.version}</version>

      <type>pom</type>

    </dependency>

  </dependencies>

  <build>

    <directory>${basedir}/target</directory>

    <finalName>${project.artifactId}-${project.version}</finalName>

    <resources>

      <resource>

        <directory>${basedir}/src/main/resources

        </directory>

      </resource>

    </resources>

    <testResources>

      <testResource>

        <directory>${basedir}/src/test/resources

        </directory>

      </testResource>

    </testResources>

    <plugins>

      <plugin>

        <artifactId>maven-enforcer-plugin</artifactId>

        <version>1.3.1</version>

        <executions>

          <execution>

            <id>enforce-all</id>

            <goals>

              <goal>enforce</goal>

            </goals>

            <configuration>

              <rules>

                <DependencyConvergence/>

              </rules>

            </configuration>

          </execution>

        </executions>

      </plugin>

    </plugins>

  </build>

</project>

 When I put it in a directory by itself and run "mvn clean compile" I get:

[WARNING] 
Dependency convergence error for org.slf4j:slf4j-api:1.7.12 paths to dependency are:
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-org.apache.tinkerpop:gremlin-core:3.0.1-incubating
      +-org.slf4j:slf4j-log4j12:1.7.12
        +-org.slf4j:slf4j-api:1.7.12
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-org.apache.tinkerpop:gremlin-core:3.0.1-incubating
      +-org.slf4j:jcl-over-slf4j:1.7.12
        +-org.slf4j:slf4j-api:1.7.12
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-com.codahale.metrics:metrics-core:3.0.1
      +-org.slf4j:slf4j-api:1.7.5
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-com.codahale.metrics:metrics-ganglia:3.0.1
      +-org.slf4j:slf4j-api:1.7.5
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-com.codahale.metrics:metrics-graphite:3.0.1
      +-org.slf4j:slf4j-api:1.7.5
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-org.slf4j:slf4j-api:1.7.5
[WARNING] 
Dependency convergence error for com.google.guava:guava:11.0.2 paths to dependency are:
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-org.reflections:reflections:0.9.9-RC1
      +-com.google.guava:guava:11.0.2
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-com.google.guava:guava:18.0
[WARNING] Rule 0: org.apache.maven.plugins.enforcer.DependencyConvergence failed with message:
Failed while enforcing releasability the error(s) are [
Dependency convergence error for org.slf4j:slf4j-api:1.7.12 paths to dependency are:
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-org.apache.tinkerpop:gremlin-core:3.0.1-incubating
      +-org.slf4j:slf4j-log4j12:1.7.12
        +-org.slf4j:slf4j-api:1.7.12
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-org.apache.tinkerpop:gremlin-core:3.0.1-incubating
      +-org.slf4j:jcl-over-slf4j:1.7.12
        +-org.slf4j:slf4j-api:1.7.12
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-com.codahale.metrics:metrics-core:3.0.1
      +-org.slf4j:slf4j-api:1.7.5
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-com.codahale.metrics:metrics-ganglia:3.0.1
      +-org.slf4j:slf4j-api:1.7.5
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-com.codahale.metrics:metrics-graphite:3.0.1
      +-org.slf4j:slf4j-api:1.7.5
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-org.slf4j:slf4j-api:1.7.5
, 
Dependency convergence error for com.google.guava:guava:11.0.2 paths to dependency are:
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-org.reflections:reflections:0.9.9-RC1
      +-com.google.guava:guava:11.0.2
and
+-com.example:convergence:1.0.0-SNAPSHOT
  +-com.thinkaurelius.titan:titan-core:1.0.0
    +-com.google.guava:guava:18.0
]

I'm under the impression that the maven-enforcer-plugin is a useful tool so I'm hesitant to turn it off.  Please correct me if I'm wrong.

Thanks!

Tim

[Marko Rodriguez]

Hi Tim,

I don't know why Maven just doesn't require the enforcer-plugin on every project! It saves so many headaches when projects have mismatched jar versions.

To solve enforcer-plugin ERRORs, you have to <exclude> intelligently and ensure that only one version of a particular package is actually used and that it works across the projects that leverage those jar classes.

Checkout how I do it in spark-gremlin/ which is <exclude> heavy cause of version conflicts:

https://github.com/apache/incubator-tinkerpop/blob/master/spark-gremlin/pom.xml

HTH,

Marko.

http://markorodriguez.com

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[Tim Stewart]

Great to hear from you Marko!  That cleared up some of the warnings and I'll keep following that example to clear up the rest.  Thanks!