Disable session saving in tomcat

When starting Tomcat you may have such an error:

Feb 16, 2012 10:24:15 AM org.apache.catalina.session.StandardManager doLoad
SEVERE: IOException while loading persisted sessions: 
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException:

If you are developing and changing your code regularly, it is most annoying. The easiest is to convince tomcat not to persist sessions across Tomcat restarts.

1. Got to file: context.xml (in eclipse, you find it under Serves->tomcat v7.0 at localhost. or something equivalent)
2. Uncomment

That's it.

Execution plan with Derby

I don't know for you, but I do have sometimes the problem to find out how a database works.
I usually have SQuirreL SQL for connecting the db, but I don't know how to retrieve the execution plan.

I went through the documentation for Derby and finally got the answer. I still will have to find out how to interpret the stuff !

CALL SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(1);
select * from EDW_BPM_OBJECT;
call SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(0);
VALUES SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();