If anyone know what can be a problem. I tried to add logging to my portlet application like described in article
but when I've added JVM Option -Dorg.apache.commons.logging.Log=org.apache.commons.logging.impl.Jdk14Logger
through web-console portal server stopped working at all. I tried to restart web-server but effect stayed the same - server doesn't work. Then I tried to remove this entry but with no effect. It seems server get broken or something like that.
If anyone has any idea it will be nice to hear.