Hi，all，
I have a web service as fellow :

declare

  %output:method("xml")

  %output:omit-xml-declaration("no")

  %output:media-type("application/xml")

  %updating

  %rest:path("/add_ehr_doc")

  %rest:POST("{$body}")

  %rest:header-param("pid","{$pid}")

  %rest:header-param("doc_id","{$doc_id}")

  %rest:header-param("op","{$op}","APND")

 function ehr:add_ehr_doc(

   $body ,$pid as xs:string,$doc_id as xs:string,$op as xs:string

 )

  {

    (:let $state:=db:open($ehr:dbname):)

    (:let $path:=if(string-length($pid)>=15 and string-length($pid)<=18) then

        substring($pid,1,6)||'/'||substring($pid,7,8)||'/'||substring($pid,15)||

      else

        $pid:)

    let $fp:=substring($pid,1,6)||'/'||substring($pid,7,8)||'/'||substring($pid,15)||'.xml'

    return

    if (db:exists($ehr:dbname,$fp)) then

       (

         insert node ($body//*:DataSet) into (doc($ehr:dbname||"/"||$fp)//*:BasicDataset),db:output(<msg>

ppend</Ack><Url>{$fp}</Url></msg>)          )

   else

     (    db:add($ehr:dbname, $body,$fp),db:output(<msg><Ack>201 new add</Ack><Url>{$fp}</Url></msg>)

       )

 };

then there is a process call the service continuously. some times, will occur this error.

10:00:10.663    10.8.252.93:40461       admin   REQUEST [POST] http://10.8.252.91:8984/add_ehr_doc

10:00:10.669    10.8.252.93:40461       admin   500     Unexpected error: Improper use? Potential bug? Your feedbac

k is welcome: Contact: basex-talk@mailman.uni-konstanz.de Version: BaseX 7.7.2 Java: Sun Microsystems Inc., 1.6.0_2

4 OS: Linux, amd64 Stack Trace: java.lang.IllegalMonitorStateException: Thread already holds one or more locks. at

org.basex.core.DBLocking.acquire(DBLocking.java:106) at org.basex.core.Context.register(Context.java:239) at org.ba

sex.http.restxq.RestXqResponse.create(RestXqResponse.java:69) at org.basex.http.restxq.RestXqModule.process(RestXqM

odule.java:108) at org.basex.http.restxq.RestXqFunction.process(RestXqFunction.java:100) at org.basex.http.restxq.R

estXqServlet.run(RestXqServlet.java:31) at org.basex.http.BaseXServlet.service(BaseXServlet.java:58) at javax.servl

et.http.HttpServlet.service(HttpServlet.java:848) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.j

ava:684) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:457) at org.eclipse.jetty.server.

handler.ScopedHand...   5.36 ms

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