Hi Mansi,

This error shouldn’t show up anymore with more recent versions of
BaseX. Could you try the latest version?

Regarding the new error, could you please tell us more about what you
were doing with your data? Did you read and write at the same time?
Did you use different BaseX instances to access the data in parallel?

Thanks
Christian

On Fri, Apr 29, 2016 at 6:28 PM, Mansi Sheth <mansi.sheth@gmail.com> wrote:
> Hello,
>
> So, now I am stuck. I am not even able to access any database:
>
> ubuntu@ip-10-0-0-83:~$ basex
> BaseX 8.2.3 [Standalone]
> Try help to get more information.
>
>> list
> Improper use? Potential bug? Your feedback is welcome:
> Contact: basex-talk@mailman.uni-konstanz.de
> Version: BaseX 8.2.3
> Java: Oracle Corporation, 1.7.0_95
> OS: Linux, amd64
> Stack Trace:
> java.lang.ArrayIndexOutOfBoundsException: 0
> at org.basex.util.Version.<init>(Version.java:33)
> at org.basex.util.Version.<init>(Version.java:24)
> at org.basex.data.MetaData.read(MetaData.java:315)
> at org.basex.data.MetaData.read(MetaData.java:262)
> at org.basex.core.cmd.List.list(List.java:83)
> at org.basex.core.cmd.List.run(List.java:52)
> at org.basex.core.Command.run(Command.java:398)
> at org.basex.core.Command.execute(Command.java:100)
> at org.basex.api.client.LocalSession.execute(LocalSession.java:132)
> at org.basex.api.client.Session.execute(Session.java:36)
> at org.basex.core.CLI.execute(CLI.java:103)
> at org.basex.core.CLI.execute(CLI.java:87)
> at org.basex.BaseX.console(BaseX.java:191)
> at org.basex.BaseX.<init>(BaseX.java:166)
> at org.basex.BaseX.main(BaseX.java:42)
>
>>
>
>
> On Tue, Apr 26, 2016 at 12:14 PM, Christian Grün <christian.gruen@gmail.com>
> wrote:
>>
>> Hi Mansi,
>>
>> Thanks for the feedback. Errors like this sometime occur if databases
>> are requested from different JVMs at the same time. See e.g. [1] for
>> more information.
>>
>> Cheers
>> Christian
>>
>> [1] http://docs.basex.org/wiki/Startup#Concurrent_Operations
>>
>>
>> On Tue, Apr 26, 2016 at 6:02 PM, Mansi Sheth <mansi.sheth@gmail.com>
>> wrote:
>> > I did try the inspect command on all databases, which should there are
>> > no
>> > inconsistencies.I was logging any exceptions, in my java code, in case
>> > of
>> > errors, and that showed me, which database in particular was in problem,
>> > dropping it helped.
>> >
>> > This was the first time I saw it. I was worried, DB has grown till the
>> > point
>> > of not being supported, when I actually panicked.
>> >
>> > Thanks,
>> > - Mansi
>> >
>> > On Tue, Apr 26, 2016 at 3:27 AM, Christian Grün
>> > <christian.gruen@gmail.com>
>> > wrote:
>> >>
>> >> Dear Mansi,
>> >>
>> >> you could try to run the INSPECT command on the affected database, or
>> >> all
>> >> databases, in order to find out if your database has gone corrupt. Did
>> >> you
>> >> repeatedly come across this error?
>> >>
>> >> Best,
>> >> Christian
>> >>
>> >> Am 25.04.2016 16:45 schrieb "Mansi Sheth" <mansi.sheth@gmail.com>:
>> >> >
>> >> > Hello,
>> >> >
>> >> > My current BaseXDB is at 920GB, with ~230 databases... I run jetty
>> >> > server visa basexhttp script with giving it explicit 30GB of RAM.
>> >> > While
>> >> > trying to access a query, thru REST api via XQUERY, I get below
>> >> > error.
>> >> >
>> >> > HTTP/1.1 400 Bad Request^M
>> >> > Content-Type: text/plain;charset=UTF-8^M
>> >> > Content-Length: 4207^M
>> >> > Server: Jetty(8.1.16.v20140903)^M
>> >> > ^M
>> >> > Improper use? Potential bug? Your feedback is welcome:
>> >> > Contact: basex-talk@mailman.uni-konstanz.de
>> >> > Version: BaseX 8.2.3
>> >> > Java: Oracle Corporation, 1.7.0_95
>> >> > OS: Linux, amd64
>> >> > Stack Trace:
>> >> > java.lang.RuntimeException: Data Access out of bounds:
>> >> > - pre value: 126882320
>> >> > - #used blocks: 495643
>> >> > - #total locks: 495643
>> >> > - access: 495642 (495643 > 495642]
>> >> >         at org.basex.util.Util.notExpected(Util.java:60)
>> >> >         at
>> >> > org.basex.io.random.TableDiskAccess.cursor(TableDiskAccess.java:458)
>> >> >         at
>> >> > org.basex.io.random.TableDiskAccess.read1(TableDiskAccess.java:148)
>> >> >         at org.basex.data.Data.kind(Data.java:306)
>> >> >         at org.basex.query.value.node.DBNode.<init>(DBNode.java:51)
>> >> >         at
>> >> > org.basex.query.value.seq.DBNodeSeq.itemAt(DBNodeSeq.java:68)
>> >> >         at
>> >> > org.basex.query.value.seq.DBNodeSeq.itemAt(DBNodeSeq.java:22)
>> >> >         at org.basex.query.value.seq.Seq$1.next(Seq.java:77)
>> >> >         at
>> >> > org.basex.query.expr.path.IterPath$1.next(IterPath.java:58)
>> >> >         at
>> >> > org.basex.query.expr.path.IterPath$1.next(IterPath.java:36)
>> >> >         at org.basex.query.MainModule$1.next(MainModule.java:114)
>> >> >         at
>> >> > org.basex.query.func.StandardFunc.cache(StandardFunc.java:384)
>> >> >         at
>> >> > org.basex.query.func.xquery.XQueryEval.eval(XQueryEval.java:129)
>> >> >         at
>> >> > org.basex.query.func.xquery.XQueryEval.eval(XQueryEval.java:59)
>> >> >         at
>> >> > org.basex.query.func.xquery.XQueryEval.value(XQueryEval.java:49)
>> >> >         at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:77)
>> >> >         at org.basex.query.QueryContext.value(QueryContext.java:421)
>> >> >         at org.basex.query.expr.gflwor.Let$LetEval.next(Let.java:187)
>> >> >         at org.basex.query.expr.gflwor.GFLWOR$1.next(GFLWOR.java:95)
>> >> >         at org.basex.query.MainModule$1.next(MainModule.java:114)
>> >> >         at org.basex.core.cmd.AQuery.query(AQuery.java:91)
>> >> >         at org.basex.core.cmd.XQuery.run(XQuery.java:22)
>> >> >         at org.basex.core.Command.run(Command.java:398)
>> >> >         at org.basex.http.rest.RESTCmd.run(RESTCmd.java:99)
>> >> >         at org.basex.http.rest.RESTQuery.query(RESTQuery.java:74)
>> >> >         at org.basex.http.rest.RESTRun.run0(RESTRun.java:41)
>> >> >         at org.basex.http.rest.RESTCmd.run(RESTCmd.java:65)
>> >> >         at org.basex.core.Command.run(Command.java:398)
>> >> >         at org.basex.core.Command.execute(Command.java:100)
>> >> >         at org.basex.core.Command.execute(Command.java:123)
>> >> >         at org.basex.http.rest.RESTServlet.run(RESTServlet.java:22)
>> >> >         at org.basex.http.BaseXServlet.service(BaseXServlet.java:64)
>> >> >         at
>> >> > javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
>> >> >         at org.eclipse.jetty.server.Server.handle(Server.java:370)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
>> >> >         at
>> >> > org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
>> >> >         at
>> >> > org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
>> >> >         at
>> >> >
>> >> > org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
>> >> >         at java.lang.Thread.run(Thread.java:745)
>> >> >
>> >> >
>> >> > --
>> >> > - Mansi
>> >
>> >
>> >
>> >
>> > --
>> > - Mansi
>
>
>
>
> --
> - Mansi