Hi Andy,
Please find the complete log 

org.apache.jena.fuseki.servlets.ActionErrorException: Can't become a write 
transaction
        at 
org.apache.jena.fuseki.servlets.ServletOps.errorOccurred(ServletOps.java:165) 
~[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.SPARQL_Update.execute(SPARQL_Update.java:239) 
~[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.SPARQL_Update.executeBody(SPARQL_Update.java:183)
 ~[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.SPARQL_Update.execute(SPARQL_Update.java:98) 
~[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.ActionService.executeLifecycle(ActionService.java:58)
 ~[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.SPARQL_Update.execPost(SPARQL_Update.java:83) 
~[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.ActionProcessor.process(ActionProcessor.java:34)
 ~[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.ActionBase.process(ActionBase.java:55) 
~[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.ActionExecLib.execAction(ActionExecLib.java:106)
 [jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.server.Dispatcher.dispatchAction(Dispatcher.java:113) 
[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.server.Dispatcher.process(Dispatcher.java:105) 
[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.server.Dispatcher.dispatch(Dispatcher.java:99) 
[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.FusekiFilter.doFilter(FusekiFilter.java:51) 
[jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
 [catalina.jar:8.5.46]
        at 
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108) 
[shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108) 
[shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
 [shiro-core-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) 
[shiro-core-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)
 [shiro-core-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
 [shiro-web-1.5.1.jar:1.5.1]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
 [catalina.jar:8.5.46]
        at 
org.apache.jena.fuseki.servlets.CrossOriginFilter.handle(CrossOriginFilter.java:284)
 [jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.CrossOriginFilter.doFilter(CrossOriginFilter.java:247)
 [jena-fuseki-core-3.15.0.jar:3.15.0]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
 [catalina.jar:8.5.46]
        at 
org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
 [log4j-web-2.13.1.jar:2.13.1]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) 
[catalina.jar:8.5.46]
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) 
[catalina.jar:8.5.46]
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
 [catalina.jar:8.5.46]
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) 
[catalina.jar:8.5.46]
        at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798) 
[tomcat-coyote.jar:8.5.46]
        at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
 [tomcat-coyote.jar:8.5.46]
        at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
 [tomcat-coyote.jar:8.5.46]
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
 [tomcat-coyote.jar:8.5.46]
        at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) 
[tomcat-coyote.jar:8.5.46]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) 
[?:?]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) 
[?:?]
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 [tomcat-util.jar:8.5.46]
        at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: org.apache.jena.dboe.transaction.txn.TransactionException: Can't 
become a write transaction
        at 
org.apache.jena.dboe.transaction.txn.Transaction.ensureWriteTxn(Transaction.java:256)
 ~[jena-dboe-transaction-3.15.0.jar:3.15.0]
        at 
org.apache.jena.tdb2.store.StorageTDB.ensureWriteTxn(StorageTDB.java:234) 
~[jena-tdb2-3.15.0.jar:3.15.0]
        at org.apache.jena.tdb2.store.StorageTDB.add(StorageTDB.java:107) 
~[jena-tdb2-3.15.0.jar:3.15.0]
        at 
org.apache.jena.dboe.storage.system.DatasetGraphStorage.add(DatasetGraphStorage.java:163)
 ~[jena-dboe-storage-3.15.0.jar:3.15.0]
        at 
org.apache.jena.sparql.core.DatasetGraphWrapper.add(DatasetGraphWrapper.java:176)
 ~[jena-arq-3.15.0.jar:3.15.0]
        at org.apache.jena.sparql.core.GraphView.performAdd(GraphView.java:149) 
~[jena-arq-3.15.0.jar:3.15.0]
        at org.apache.jena.graph.impl.GraphBase.add(GraphBase.java:184) 
~[jena-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.reasoner.rulesys.FBRuleInfGraph.performAdd(FBRuleInfGraph.java:620)
 ~[jena-core-3.15.0.jar:3.15.0]
        at org.apache.jena.graph.impl.GraphBase.add(GraphBase.java:184) 
~[jena-core-3.15.0.jar:3.15.0]
        at 
org.apache.jena.sparql.core.DatasetGraphCollection.add(DatasetGraphCollection.java:46)
 ~[jena-arq-3.15.0.jar:3.15.0]
        at 
org.apache.jena.sparql.modify.UpdateEngineWorker.addToDatasetGraph(UpdateEngineWorker.java:540)
 ~[jena-arq-3.15.0.jar:3.15.0]
        at 
org.apache.jena.sparql.modify.UpdateEngineWorker.visit(UpdateEngineWorker.java:309)
 ~[jena-arq-3.15.0.jar:3.15.0]
        at 
org.apache.jena.sparql.modify.request.UpdateDataInsert.visit(UpdateDataInsert.java:27)
 ~[jena-arq-3.15.0.jar:3.15.0]
        at 
org.apache.jena.sparql.modify.UpdateVisitorSink.send(UpdateVisitorSink.java:46) 
~[jena-arq-3.15.0.jar:3.15.0]
        at 
org.apache.jena.sparql.modify.UpdateVisitorSink.send(UpdateVisitorSink.java:26) 
~[jena-arq-3.15.0.jar:3.15.0]
        at org.apache.jena.atlas.iterator.Iter.sendToSink(Iter.java:678) 
~[jena-base-3.15.0.jar:3.15.0]
        at 
org.apache.jena.sparql.modify.UpdateProcessorBase.execute(UpdateProcessorBase.java:60)
 ~[jena-arq-3.15.0.jar:3.15.0]
        at org.apache.jena.update.UpdateAction.execute$(UpdateAction.java:228) 
~[jena-arq-3.15.0.jar:3.15.0]
        at org.apache.jena.update.UpdateAction.execute(UpdateAction.java:194) 
~[jena-arq-3.15.0.jar:3.15.0]
        at 
org.apache.jena.fuseki.servlets.SPARQL_Update.execute(SPARQL_Update.java:223) 
~[jena-fuseki-core-3.15.0.jar:3.15.0]
        ... 55 more









On 2021/02/08 22:52:35, Andy Seaborne <a...@apache.org> wrote: 
> Was there a "cause" exception recorded as well?
> 
> On 08/02/2021 15:05, Sushanth Vaddaram wrote:
> > [2021-02-08 20:26:03] Log4jLogger WARN  ActionErrorException with cause
> > org.apache.jena.fuseki.servlets.ActionErrorException: Can't become a write 
> > transaction
> >     at 
> > org.apache.jena.fuseki.servlets.ServletOps.errorOccurred(ServletOps.java:165)
> >  ~[jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.servlets.SPARQL_Update.execute(SPARQL_Update.java:239)
> >  ~[jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.servlets.SPARQL_Update.executeBody(SPARQL_Update.java:183)
> >  ~[jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.servlets.SPARQL_Update.execute(SPARQL_Update.java:98)
> >  ~[jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.servlets.ActionService.executeLifecycle(ActionService.java:58)
> >  ~[jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.servlets.SPARQL_Update.execPost(SPARQL_Update.java:83)
> >  ~[jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.servlets.ActionProcessor.process(ActionProcessor.java:34)
> >  ~[jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.servlets.ActionBase.process(ActionBase.java:55) 
> > ~[jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.servlets.ActionExecLib.execAction(ActionExecLib.java:106)
> >  [jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.server.Dispatcher.dispatchAction(Dispatcher.java:113)
> >  [jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.server.Dispatcher.process(Dispatcher.java:105) 
> > [jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.server.Dispatcher.dispatch(Dispatcher.java:99) 
> > [jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.jena.fuseki.servlets.FusekiFilter.doFilter(FusekiFilter.java:51) 
> > [jena-fuseki-core-3.15.0.jar:3.15.0]
> >     at 
> > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
> >  [catalina.jar:8.5.46]
> >     at 
> > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
> >  [catalina.jar:8.5.46]
> >     at 
> > org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
> >  [shiro-web-1.5.1.jar:1.5.1]
> >     at 
> > org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
> >  [shiro-web-1.5.1.jar:1.5.1]
> >     at 
> > org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
> >  [shiro-web-1.5.1.jar:1.5.1]
> >     at 
> > org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
> >  [shiro-web-1.5.1.jar:1.5.1]
> >     at 
> > org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
> >  [shiro-web-1.5.1.jar:1.5.1]
> >     at 
> > org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
> >  [shiro-web-1.5.1.jar:1.5.1]
> >     at 
> > org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
> >  [shiro-web-1.5.1.jar:1.5.1]
> 

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