multiple SLF4J bindings Error with activemq-all-5.6.0.jar

Question

When I upgrade to activemq-all-5.6.0

I get this error during server startup

SLF4J: Class path contains multiple SLF4J bindings

I don\'t have this i

Answer 1

The ActiveMQ guys use the Maven Shade Plugin to create the activemq-all "ueber" jar. Somewhere between version 5.5.1 and 5.6.0 they added the org.slf4j:slf4j-log4j12 dependency - hence your problem.

Unfortunately because they used the shade plugin you can not use exclusions in your activemq-all dependency definition in your POM.

Instead you will need to completely replace the activemq-all dependency with all the required individual dependencies (except of course the org.sl4j-log4j12 one).

The following page details all the required dependencies: http://activemq.apache.org/initial-configuration.html#InitialConfiguration-RequiredJARs

Alternatively the following is the list of all dependencies (required and optional) included in the activemq-all jar (taken from the configuration of the shade plugin in the activemq-all pom):

org.apache.activemq:activemq-camel
org.apache.activemq:activemq-core
org.apache.activemq:activemq-console
org.apache.activemq:activemq-jaas
org.apache.activemq:activemq-optional
org.apache.activemq:kahadb
org.apache.geronimo.specs:geronimo-jms_1.1_spec
org.apache.geronimo.specs:geronimo-jta_1.0.1B_spec
org.apache.geronimo.specs:geronimo-j2ee-management_1.1_spec
org.apache.geronimo.specs:geronimo-annotation_1.0_spec
org.slf4j:slf4j-api
org.slf4j:slf4j-log4j12
log4j:log4j

Hope that helps.

Answer 2

I had the same problem while using Spring. What helped me was replacing the dependency of activemq-all with:

<dependency>
    <groupId>org.apache.activemq</groupId>
    <artifactId>activemq-spring</artifactId>
    <version>5.14.3</version>
</dependency>

Hope this will help anyone...