SLF4J链接错误

Question

I have configured JMS Provide in WebSphere Application Server that will use ActiveMQ. For sending message WebSphere needs " activemq-all-5.9.1.jar " in classpath so I added it. This " activemq-all " contains slf4j classes in it.

Now my application contains " slf4j-api-1.7.5.jar ". When I start WebSphere it gives

Caused by: java.lang.LinkageError: org.slf4j.LoggerFactory
    at java.lang.ClassLoader.defineClassImpl(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:264)

I tried using different activemq jars that does not contain slf4j classes but at that time it gives ClassNotFoundExeption

Answer 1

This is because slf4j logger cannot be binded twice. In current scenario both server and application are binding slf4j logger.

Use old ActiveMQ jars that does not depend on slf4j logger. In this way applications default logger will work.