Using JBoss 6.0.0.M4.

There are many invalid manifests in the JBoss client libraries. For example, jacorb.jar contains this line in MANIFEST.MF

Class-Path: slf4j-api-1.5.6.jar slf4j-jdk14-1.5.6.jar concurrent-1.3.2.jar antlr-2.7.2.jar

However, there is no slf4j-api-1.5.7.jar, the correct file name is slf4j-api.jar.