Lock files on Shapefiles are not released

[dstenger]

When a request accesses a Shapefile data source, lock files are created.

E.g.:

-rw-r--r-- 1 ogcri ogcri 1,1M Apr 14 06:33 Lakes.h2.db
-rw-r----- 1 ogcri ogcri  100 Apr 14 06:33 Lakes.lock.db

Those lock files are not removed after the request has been processed but stay there until the application server (e.g. Tomcat) is restarted.

This is no problem if just one deegree instance accesses the workspace.
However, when multiple deegree instances access the workspace, only one instance can use the Shapefile. All other instances cannot access the Shapefile data source because of the lock file.