Re: [basex-talk] FW: Reg : Over Laping Exception

29 Aug 2014


      Hi Chandra,
as indicated in my last mail, you'll need to invest some more time
with the BaseX sources. I assume you are creating several instances of
the Context instance via the default constructor. Its documentation
states that this is only allowed once in the lifetime of a project
[1].
If you want to take this further, you could have a look into the
ClientListener [2] or LocalSession [3] classes, which are passing on a
central Context instance. You could also check out the JUnit testing
code in the basex and basex-tests directories.
Best,
Christian
[1] https://github.com/BaseXdb/basex/blob/master/basex-core/src/main/java/org/ba...
[2] https://github.com/BaseXdb/basex/blob/master/basex-core/src/main/java/org/ba...
[3] https://github.com/BaseXdb/basex/blob/master/basex-core/src/main/java/org/ba...
On Fri, Aug 29, 2014 at 7:36 AM, Chandrasekhar
chandrasekhar.r@intense.in wrote:
...
Dear Christian
                I gone through the links which you are given in below mail , i used GLOBAL LOCK(true) and PARALLEL(1) option in my code ,but i am getting same exception(overlapping file) .

                    Dear Christian at this time i cant change it to the client server architecture,please do the needful.


Thanks & Regards
Chandra Sekhar

From: Christian Grün christian.gruen@gmail.com
Sent: Thursday, August 28, 2014 7:33 PM
To: Chandrasekhar
Cc: basex-talk@mailman.uni-konstanz.de
Subject: Re: [basex-talk] Reg : Over Laping Exception
Dear Chandra,
Please use the client/server architecture of BaseX if you want to run
multiple queries in parallel. After all, it's also possible to do
multiple queries without a running server instance, but it's usually
not possible to make it work without spending more time with the BaseX
code.
Please take your time and have a look at our documentation, it should
give you some more instructions (e.g. [1,2,3]).
All the best,
Christian
[1] http://docs.basex.org/wiki/Startup
[2] http://docs.basex.org/wiki/Transactions
[3] http://docs.basex.org/wiki/Clients
On Thu, Aug 28, 2014 at 3:32 PM, Chandrasekhar
chandrasekhar.r@intense.in wrote:
...
Dear Team
                     When i querying on same collection at same time(multiple hits) i am getting this probelm.To run the query we are using the below steps.

                    Context context = new Context();
                     context.globalopts.set(GlobalOptions.DBPATH,"DBPATH");
                     String result = new XQuery(query).execute(context);
                     context.close();


Thanks & Regards
Chandra Sekhar
________________________________________
From: Christian Grün christian.gruen@gmail.com
Sent: Thursday, August 28, 2014 6:39 PM
To: Chandrasekhar
Cc: basex-talk@mailman.uni-konstanz.de
Subject: Re: [basex-talk] Reg : Over Laping Exception
Dear Chandrasehkar,
this error message can usually be derived to an unorthodox way of
using our APIs, or mixing direct and server-side access to BaseX.
Could you please give us more feedback on how the error was triggered?
Best,
Christian
On Thu, Aug 28, 2014 at 2:40 PM, Chandrasekhar
chandrasekhar.r@intense.in wrote:
...
Dear Team
            We are getting the below exception wen xquery

executing.Please do the needful
                                org.basex.core.BaseXException: Improper

use? Potential bug? Your feedback is welcome:
Contact: basex-talk@mailman.uni-konstanz.de
Version: BaseX 7.9
Java: Oracle Corporation, 1.7.0_07
OS: Windows 7, x86
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:188)
    at
org.basex.io.random.TableDiskAccess.sharedLock(TableDiskAccess.java:175)
    at org.basex.io.random.TableDiskAccess.<init>(TableDiskAccess.java:88)
    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.query.QueryResources.open(QueryResources.java:263)
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Re: [basex-talk] FW: Reg : Over Laping Exception