Mod_cluster depends on jboss-logging.jar that is missing in Solaris zips.

java.lang.NoClassDefFoundError: org/jboss/logging/Logger
  at org.jboss.modcluster.container.catalina.standalone.ModClusterListener.<clinit>(ModClusterListener.java:61)
Caused by: java.lang.ClassNotFoundException: org.jboss.logging.Logger

See comparison:

• Solaris contains:
  • jws-3.0/share/extras/log4j-eap6.jar
• RHEL6/7 contains:
  • jws-3.0/tomcat7/lib/jboss-logging.jar
  • jws-3.0/tomcat8/lib/jboss-logging.jar
  • jws-3.0/extras/log4j-eap6.jar
• Windows contains
  • jws-3.0/share/apache-tomcat-7.0.59/lib/jboss-logging.jar
  • jws-3.0/share/apache-tomcat-8.0.18/lib/jboss-logging.jar
  • jws-3.0/share/extras/log4j-eap6.jar

WDYT?