[Cayenne-user] logging first steps

The culprit is probably on eu.ngong.ehour.tracking.impl.Run.run(Run.java:114).
The exception trace seems incomplete, I'm not seeing the trace of the CayenneRuntimeException. If you have code like

try {
...
} catch (Exception e) {
throw TrackingException ("Unexpected exception: " + e);
}

this is the kind of unhelpful trace your're getting. You should probably do

try {
...
} catch (Exception e) {
throw TrackingException ("Unexpected exception", e);
}

Then your TrackingException will be "chained" with the original exception, and you'll get a trace for your exception, a line of "caused by:", and the full trace of the CayenneRuntimeException, which would then allow people to take a look where this originated from inside Cayenne and give hints what could be wrong.

(This is probably unrelated to the logging problems you're experiencing.)