java.sql.SQLException: The database is already in use by another process: org.hsqldb.NIOLockFile@d80fd9e8\[file =C:\Projects\JavaNetBeans\DBtest\db\officer.lck.lck, exists=true, locked=false, valid=false, fl =null\]: java.lang.Exception: checkHeartbeat(): lock file \[C:\Projects\JavaNetBeans\DBtest\db\officer.lck.lck\] is presumably locked by another process.

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    java.sql.SQLException: The database is already in use by another process: org.hsqldb.NIOLockFile@d80fd9e8\[file =C:\Projects\JavaNetBeans\DBtest\db\officer.lck.lck, exists=true, locked=false, valid=false, fl =null\]: java.lang.Exception: checkHeartbeat(): lock file \[C:\Projects\JavaNetBeans\DBtest\db\officer.lck.lck\] is presumably locked by another process.
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    Root Cause Analysis

    1. java.sql.SQLException

      The database is already in use by another process: org.hsqldb.NIOLockFile@d80fd9e8\[file =C:\Projects\JavaNetBeans\DBtest\db\officer.lck.lck, exists=true, locked=false, valid=false, fl =null\]: java.lang.Exception: checkHeartbeat(): lock file \[C:\Projects\JavaNetBeans\DBtest\db\officer.lck.lck\] is presumably locked by another process.

      at org.hsqldb.jdbc.jdbcUtil.sqlException()
    2. HSQLDB
      jdbcDriver.connect
      1. org.hsqldb.jdbc.jdbcUtil.sqlException(jdbcUtil.java:67)
      2. org.hsqldb.jdbc.jdbcConnection.<init>(jdbcConnection.java:2427)
      3. org.hsqldb.jdbcDriver.getConnection(jdbcDriver.java:188)
      4. org.hsqldb.jdbcDriver.connect(jdbcDriver.java:166)
      4 frames
    3. Java RT
      DriverManager.getConnection
      1. java.sql.DriverManager.getConnection(DriverManager.java:525)
      2. java.sql.DriverManager.getConnection(DriverManager.java:171)
      2 frames
    4. testdb
      Testdb.main
      1. testdb.Testdb.<init>(Testdb.java:38)
      2. testdb.Testdb.main(Testdb.java:123)
      2 frames