To debug lock timeout errors, set derby.locks.monitor=true and derby.locks.deadlockTrace=true in derby.properties. This will print the lock table information to the derby.log when the timeout happens. If you also set derby.language.logStatementText=true, then all the statements executed on the system will be written out to the derby.log
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Apache Derby, an Apache DB subproject, is an open source relational database implemented entirely in Java.
Formerly known as IBM Cloudscape it is now included in Java 6 as Java DB.