Hi Pham,
If you use BaseX with Java, you should either work with the
Client/Server architecture (see [1] for examples) or ensure that all
operations are based on and registered via the same database context
(Context.java). Feel free to share a minimum Java example with us.
Best,
Christian
[1] https://docs.basex.org/wiki/Java_Examples
On Thu, Jul 2, 2020 at 11:01 AM Pham Huu Bang wrote:
>
> Hello,
>
> I have a Java web application which relies on BaseX library to mostly read
> XML files (they are quite big, e.g: 20 MB per file) by XQuery. The XQuery is
> also quite complicated. It takes ~3 seconds to query. Configuration file
> .basex: https://pastebin.com/3EH7MJi5
>
> I got the error below when multiple requests are processed in parallel.
> I wonder how BaseX can work in this case without error like this?
>
> Thanks,
>
> Version: BaseX 9.2.4
> Java: Oracle Corporation, 1.8.0_222
> 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:1107)
> at org.basex.io.random.TableDiskAccess.lock(TableDiskAccess.java:147)
> at org.basex.io.random.TableDiskAccess.(TableDiskAccess.java:79)
> at org.basex.data.DiskData.init(DiskData.java:125)
> at org.basex.data.DiskData.(DiskData.java:84)
> at org.basex.core.cmd.Open.open(Open.java:99)
> at org.basex.core.cmd.Open.run(Open.java:48)
> at org.basex.core.Command.run(Command.java:257)
> at org.basex.core.Command.execute(Command.java:93)
> at org.basex.core.Command.execute(Command.java:116)
