Exception shutting down HSQL db

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java.lang.RuntimeException: java.sql.SQLException: The database is already in use by another process: org.hsqldb.persist.NIOLockFile@89ed8abc[file =C:\Program Files\AgileTrack\agiletrack_db.lck, exists=true, locked=false, valid=false, fl =null]: java.lang.Exception: java.io.IOException: The process cannot access the file because another process has locked a portion of the file : C:\Program Files\AgileTrack\agiletrack_db.lck

at agiletrack.server.persistence.DatabaseResourceProvider.<init>(DatabaseResourceProvider.java:39) at agiletrack.persistence.hsqldb.TrackerHSQLDatabase.close(TrackerHSQLDatabase.java:115) at agiletrack.persistence.hsqldb.TrackerHSQLDatabase$1.run(TrackerHSQLDatabase.java:767) at java.lang.Thread.run(Unknown Source)
Caused by: java.sql.SQLException: The database is already in use by another process: org.hsqldb.persist.NIOLockFile@89ed8abc[file =C:\Program Files\AgileTrack\agiletrack_db.lck, exists=true, locked=false, valid=false, fl =null]: java.lang.Exception: java.io.IOException: The process cannot access the file because another process has locked a portion of the file : C:\Program Files\AgileTrack\agiletrack_db.lck at org.hsqldb.jdbc.Util.sqlException(Unknown Source) at org.hsqldb.jdbc.jdbcConnection.<init>(Unknown Source) at org.hsqldb.jdbcDriver.getConnection(Unknown Source) at org.hsqldb.jdbcDriver.connect(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at org.apache.commons.dbcp.DriverManagerConnectionFactory.createConnection(DriverManagerConnectionFactory.java:48) at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:290) at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:771) at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95) at agiletrack.server.persistence.DatabaseResourceProvider.<init>(DatabaseResourceProvider.java:36) ... 3 more