Hi,
    I have 3 application modules. One module, creates the xml database, the second/third module execute queries on the database (no updates are being performed on the database).

    When the second and the third module try accessing the database, once module is able to query the database while the other module ends up with the below exception.

org.basex.core.BaseXException: Improper use? Potential bug? Your feedback is welcome:
Contact: basex-talk@mailman.uni-konstanz.de
Version: BaseX 7.8 beta
Java: Oracle Corporation, 1.7.0_25
OS: Linux, amd64
Stack Trace:
java.nio.channels.OverlappingFileLockException
        at sun.nio.ch.SharedFileLockTable.checkList(FileLockTable.java:255)
        at sun.nio.ch.SharedFileLockTable.add(FileLockTable.java:152)
        at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:1017)
        at org.basex.io.random.TableDiskAccess.lck(TableDiskAccess.java:183)
        at org.basex.io.random.TableDiskAccess.sharedLock(TableDiskAccess.java:170)
        at org.basex.io.random.TableDiskAccess.<init>(TableDiskAccess.java:83)
        at org.basex.data.DiskData.init(DiskData.java:122)
        at org.basex.data.DiskData.<init>(DiskData.java:92)
        at org.basex.core.cmd.Open.open(Open.java:68)
        at org.basex.core.cmd.Open.run(Open.java:35)
        at org.basex.core.Command.run(Command.java:344)
        at org.basex.core.Command.exec(Command.java:320)
        at org.basex.core.Command.execute(Command.java:77)
        at org.basex.core.Command.execute(Command.java:89)


Below are the options being set:
context.globalopts.set(GlobalOptions.GLOBALLOCK, false) ;
context.globalopts.set(GlobalOptions.PARALLEL, 1) ;  //After referring to https://github.com/BaseXdb/basex/issues/574

When the same exercise is being undertaken on a windows machine, the above behavior does not occur.

Regards
Narasimham