It looks like tomcat's loading an older version of hsqldb.jar.Older versions of Tersus bundled (and assumed) hsqldb version 1.7.x. As of verison 1.4.6, hsqldb was upgraded to version 2.0.
If you previously deployed applications using an older version of Tersus, then you must have installed an older version of the jar file, and so you must now upgrade it.
Note that you'll also need to upgrade the database files for each deployed application (see details in http://www.tersus.com/#Id=4742).
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