Where I could find the find the class weblogic.management.commo.WebLogicMBeanMaker ?????
I thought it was in the file weblogic.jar, but the file ony has 1 KB, but there are others like weblogic-ja.jar with 515 KB, weblogic-de.jar WITH 50 KB, etc, etc...
Adding weblogic.jar to the CLASSPATH worked out for me.