Thank you for your respose :) I think my distro is OK, as you say the error points to a conflict in the classpath.
I installed activemq downloading the binary and uncompressing it. I set the ACTIVEMQ_HOME environment variable pointing to the activemq installation directory. In the ./lib folder I have slf4j-api-1.6.6.jar and I'm using jdk1.7.0_17 The CLASSPATH variable is empty, it points to nothing. Should CLASSPATH point to activemq installation directory also? Thanks !!! -- View this message in context: http://activemq.2283324.n4.nabble.com/activemq-5-8-0-error-executing-examples-tp4669732p4669750.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.