Can I start derby code in debug mode from eclipse.
Yes, that should work fine, assuming that you have the right overall configuration settings. Derby is 100% pure Java, and any Java debugger can be used. I often use JSwat, which is based on the Eclipse debugging engine I believe. I have also used other Java debuggers. Did you build Derby from source using Eclipse? Or are you trying to use the Eclipse debugger for a copy of Derby that you built in some other fashion? There are some general pieces of advice here: https://wiki.apache.org/db-derby/BuildingDerby Hope this helps, bryan
