Michael O'Cleirigh created AMQ-5009: ---------------------------------------
Summary: Switch activemq-all from shaded jar to pom dependency aggregator Key: AMQ-5009 URL: https://issues.apache.org/jira/browse/AMQ-5009 Project: ActiveMQ Issue Type: Improvement Affects Versions: 5.9.0 Reporter: Michael O'Cleirigh Fix For: 5.10.0 I encountered an issue when adding a dependency on activemq-all into my project; it caused a collision with our existing dependency on *slf4j-log4j12* {code} SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/root/.m2/repository/org/slf4j/slf4j-log4j12/1.6.2/slf4j-log4j12-1.6.2.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/root/.m2/repository/org/apache/activemq/activemq-all/5.9.0/activemq-all-5.9.0.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. {code} The main issue is that because the activemq-all jar is shaded there is no way for us to use maven dependency *exclusions* command to not take the activemq-all contributed *slf4j-log4j12* artifact. There is a straight forward fix to this issue. Switch from using the *maven-shade-plugin* to using a pom dependency which aggregates the activemq dependencies in a maven controllable way. By making the packaging of the *activemq-all* artifact pom it means that when it is included in a project only the transitive dependencies that it declares are included, the pom artifact itself is not. I've tested that this works in our project that depends on activemq-all 5.9.0 and also have a patch prepared against the current 5.10-SNAPSHOT trunk. The only difference to the consumer of the activemq-all artifact is that they have to specify the *<type>* as pom. For example: {code} <dependency> <groupId>org.apache.activemq</groupId> <artifactId>activemq-all</artifactId> <version>5.9.0</version> <type>pom</type> </dependency> {code} The Apache Wicket project uses the same approach, see [here|http://repo1.maven.org/maven2/org/apache/wicket/wicket/6.13.0/wicket-6.13.0.pom] -- This message was sent by Atlassian JIRA (v6.1.5#6160)