Concurrency problems with REST API

On Sat, Mar 31, 2012 at 1:25 AM, Tobias Hofer <tobias.hofer at basis06.ch> wrote: > Hi, > > I'm using the REST API of BaseX 7.2 and run into concurrency problems. > If I add new documents in parallel then the server will stop working > after adding a few documents. > > > My command template looks like: > <?xml version="1.0" encoding="UTF-8"?> > <command xmlns="http://basex.org/rest"><text><![CDATA[ > ADD TO $KEY$ > <node id="$KEY$" /> > ]]></text></command> > > > I call the REST API using curl: > for ((i=0; i<10; i++)); do > (cp tx-template tx$i; replace '$KEY$' $i -- tx$i; > curl -i -X POST -H "Content-Type: application/xml" -T tx$i > "admin:admin@localhost:8984/rest/QDEV") & done > > > After four or less insert the following error occurs: > HTTP/1.1 400 Bad Request > Content-Type: text/plain; charset=utf-8 > Content-Length: 2247 > Server: Jetty(6.1.26) > > java.lang.NullPointerExceptionjava.lang.NullPointerExceptionjava.lang.NullPointerExceptionorg.xml.sax.SAXParseException: cvc-type.3.1.2: Element 'command' is a simple type, so it must have no element information item [children].org.xml.sax.SAXParseException: cvc-type.3.1.2: Element 'command' is a simple type, so it must have no element information item [children].Improper use? Potential bug? Your feedback is welcome: > Contact: basex-talk at mailman.uni-konstanz.de > Version: BaseX 7.2 > Java: Sun Microsystems Inc., 1.6.0_26 > OS: Linux, amd64 > Stack Trace: > java.lang.NullPointerException > org.basex.core.cmd.Add.run(Add.java:92) > org.basex.core.Command.run(Command.java:345) > org.basex.core.Command.exec(Command.java:324) > org.basex.core.Command.execute(Command.java:76) > org.basex.server.LocalSession.execute(LocalSession.java:134) > org.basex.server.LocalSession.execute(LocalSession.java:126) > org.basex.server.Session.execute(Session.java:51) > org.basex.http.rest.RESTCommand.run(RESTCommand.java:40) > org.basex.http.rest.RESTPost.run(RESTPost.java:129) > org.basex.http.rest.RESTServlet.run(RESTServlet.java:14) > org.basex.http.BaseXServlet.service(BaseXServlet.java:38) > javax.servlet.http.HttpServlet.service(HttpServlet.java:820) > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401) > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766) > org.mortbay.jetty.handler.HandlerList.handle(HandlerList.java:49) > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) > org.mortbay.jetty.Server.handle(Server.java:326) > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) > org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945) > org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756) > org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) > org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) > org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410) > > > Now, the server cannot be accessed any more. Any further call will return > "Database 'MYDB' is currently opened by another client. A restart helps. > > The error does not happen if the commands are executed in sequence. > > Please help. > > Regards, > Tobias Hofer > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk at mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk