BaseX-Talk September 2025

basex-talk@mailman.uni-konstanz.de

7 participants
4 discussions

Add namespace bindings via copy/modify/return
by Hans-Juergen Rennau 24 Sep '25

24 Sep '25

Dear BaseX people, I cannot use copy/modify/return in order to add a namespacing: let $doc := <doc><a/></doc>return copy $doc_ := $doc modify insert node namespace xyz {'https://basex.org/ns'} into $doc_ return $doc_ =><doc> <a/></doc> Is this a bug? Kind regards,Hans-Jürgen

5 8

Multithreading issues after upgrade to BaseX 12
by Johannes Bauer 22 Sep '25

22 Sep '25

Hi, we experience some problems after the upgrade to version 12 with the fulltext search. We are using xquery:fork-join() to run the fulltext search on multiple databases at the same time (see attachment). This worked fine with version 11 but has strange effects after the upgrade to version 12. With BaseX 11 the log output is like this: 09:03:51.054 [0:0:0:0:0:0:0:1]:55079 admin REQUEST [POST] /dba/query?file=ftsearch.xq 09:03:51.203 SERVER admin TRACE local:search-db(ALL) 100.4 ms 09:03:51.204 SERVER admin TRACE local:search-db(ALL) 1721 09:03:51.243 SERVER admin TRACE local:matches() 38.84 ms 09:03:51.270 SERVER admin TRACE local:search-db(MD) 166.69 ms 09:03:51.270 SERVER admin TRACE local:search-db(MD) 1883 09:03:51.282 SERVER admin TRACE local:matches() 11.9 ms ... 09:03:52.284 SERVER admin TRACE local:search-db(XP) 307.84 ms 09:03:52.284 SERVER admin TRACE local:search-db(XP) 74128 09:03:52.525 SERVER admin TRACE local:matches() 241.64 ms 09:03:52.796 SERVER admin TRACE local:matches() 581.56 ms 09:03:52.796 SERVER admin TRACE local:search-distinct() search "test" 1710.79 ms 09:03:53.200 [0:0:0:0:0:0:0:1]:55079 admin 200 2160.7 ms After about 2 seconds the search is finished. With BaseX 12 two things might happen. ConcurrentModificationException This happens almost immediatelly. 500 Unexpected error: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 12.0 Java: Eclipse Adoptium, 21 OS: Windows 10, amd64 Stack Trace: java.util.ConcurrentModificationException at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1095) at java.base/java.util.ArrayList$Itr.next(ArrayList.java:1049) at org.basex.query.QueryResources.close(QueryResources.java:94) at org.basex.query.QueryContext.close(QueryContext.java:543) at org.basex.http.restxq.RestXqResponse.finish(RestXqResponse.java:152) at org.basex.http.web.WebResponse.create(WebResponse.java:63) at org.basex.http.restxq.RestXqServlet.run(RestXqServlet.java:70) at org.basex.http.BaseXServlet.service(BaseXServlet.java:68) at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:587) at org.eclipse.jetty.ee9.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1397) at org.eclipse.jetty.ee9.servlet.ServletHolder.handle(ServletHolder.java:765) at org.eclipse.jetty.ee9.servlet.ServletHandler.doHandle(ServletHandler.java:528) at org.eclipse.jetty.ee9.nested.ScopedHandler.handle(ScopedHandler.java:127) at org.eclipse.jetty.ee9.security.SecurityHandler.handle(SecurityHandler.java:603) at org.eclipse.jetty.ee9.nested.HandlerWrapper.handle(HandlerWrapper.java:124) at org.eclipse.jetty.ee9.nested.ScopedHandler.nextHandle(ScopedHandler.java:197) at org.eclipse.jetty.ee9.nested.SessionHandler.doHandle(SessionHandler.java:612) at org.eclipse.jetty.ee9.nested.ScopedHandler.nextHandle(ScopedHandler.java:195) at org.eclipse.jetty.ee9.nested.ContextHandler.doHandle(ContextHandler.java:1045) at org.eclipse.jetty.ee9.nested.ScopedHandler.nextScope(ScopedHandler.java:164) at org.eclipse.jetty.ee9.servlet.ServletHandler.doScope(ServletHandler.java:483) at org.eclipse.jetty.ee9.nested.ScopedHandler.nextScope(ScopedHandler.java:162) at org.eclipse.jetty.ee9.nested.SessionHandler.doScope(SessionHandler.java:589) at org.eclipse.jetty.ee9.nested.ScopedHandler.nextScope(ScopedHandler.java:162) at org.eclipse.jetty.ee9.nested.ContextHandler.doScope(ContextHandler.java:966) at org.eclipse.jetty.ee9.nested.ScopedHandler.handle(ScopedHandler.java:125) at org.eclipse.jetty.ee9.nested.ContextHandler.handle(ContextHandler.java:1719) at org.eclipse.jetty.ee9.nested.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1565) at org.eclipse.jetty.ee9.nested.HttpChannel.dispatch(HttpChannel.java:724) at org.eclipse.jetty.ee9.nested.HttpChannel.handle(HttpChannel.java:512) at org.eclipse.jetty.ee9.nested.ContextHandler$CoreContextHandler$CoreToNestedHandler.handle(ContextHandler.java:3029) at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1071) at org.eclipse.jetty.server.Server.handle(Server.java:182) at org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run(HttpChannelState.java:678) at org.eclipse.jetty.server.internal.HttpConnection.onFillable(HttpConnection.java:416) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:322) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:99) at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:480) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:443) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:293) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:201) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:311) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:981) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1211) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1166) at java.base/java.lang.Thread.run(Thread.java:1583) 189.44 ms Full text search never finishes 09:00:12.422 [0:0:0:0:0:0:0:1]:55041 admin REQUEST [POST] /dba/query?file=ftsearch.xq 09:00:12.633 SERVER admin TRACE local:search-db(ALL) 115.46 ms 09:00:12.635 SERVER admin TRACE local:search-db(ALL) 1721 09:00:12.672 SERVER admin TRACE local:matches() 37.09 ms 09:00:12.711 SERVER admin TRACE local:search-db(MD) 194.24 ms 09:00:12.711 SERVER admin TRACE local:search-db(MD) 1883 09:00:12.725 SERVER admin TRACE local:matches() 13.66 ms 09:00:12.851 SERVER admin TRACE local:search-db(LS) 334.48 ms 09:00:12.851 SERVER admin TRACE local:search-db(LS) 169524 09:00:12.923 SERVER admin TRACE local:search-db(CT) 406.58 ms 09:00:12.923 SERVER admin TRACE local:search-db(CT) 80086 ... 09:00:13.483 SERVER admin TRACE local:search-db(US) 47012 09:00:13.553 SERVER admin TRACE local:search-db(POC) 828.06 ms 09:00:13.554 SERVER admin TRACE local:search-db(POC) 10147 09:00:13.693 SERVER admin TRACE local:search-db(MR) 1020.89 ms 09:00:13.693 SERVER admin TRACE local:search-db(MR) 223155 The process "hangs" and never finishes and CPU is running on full load. The current database where it hangs is always a different one. Does this have anything to do with the Jetty update? It seems to be related to the multithreading. Best Regards Johannes

2 1

Who wants to take over the management of my RBaseX package?
by Ben Engbers 16 Sep '25

16 Sep '25

Since my retirement (five years ago), there has been no reason for me to program in R or to continue working on maintaining my RBaseX package. This package is still being downloaded, and in all the years it has been available on the internet, I have never received any questions about it. Maintaining it will therefore take very little time. When I do program, I use the C++ language (and I still hope to get my C++ client for BaseX bug-free). Is there anyone who would like to take over the management of RBaseX? Ben Engbers

1 0

load-xquery-module
by Rob Stapper 15 Sep '25

15 Sep '25

Hi Christian, I'm experimenting with dynamic modul loading using: 'load-xquery-module'. I have a few questions concerning this function: - Does this function cache the loaded modul like "import module" does? If I interpret the profiling data correcty, it does not. If so is it possible to also cache dynamicly loaded modules? - "location-hints" of this function accepts a set of locations. It seems that all these locations must contain a module with the given modul-uri. I would expect the one would be sufficient. What is the idea behind this locationset? Thanx in advance for your response. mvgr. Rob Stapper

2 1

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BaseX-Talk September 2025