multiple SLF4J bindings Error with activemq-all-5.6.0.jar
activemq-classic, maven, slf4j
Solution
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.
Problem
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 issue when using activemq-all-5.5.1 On checking I do find that there StaticLoggerBinder.class in both activemq-all-5.6.0.jar and slf4j-log4j12-1.5.10.jar which is causing the issue Please do help in debugging this issue My pom.xml is as follows ``` <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.5.10</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <version>1.5.10</version> <scope>runtime</scope> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.5.10</version> <scope>runtime</scope> </dependency> ``` The active mq dependency is like this Old Version 5.5.1 (This works) ``` <dependency> <groupId>org.apache.activemq</groupId> <artifactId>activemq-all</artifactId> <version>5.5.1</version> </dependency> ``` New Version 5.6.0 (This gives the error) ``` <dependency> <groupId>org.apache.activemq</groupId> <artifactId>activemq-all</artifactId> <version>5.6.0</version> </dependency> ``` Thanks in advance.