Can not write a field name, expecting a value

1
Hi Experts,   We're triggering the API, and when it finishes correctly,it showing the below error :   2023-06-07 05:57:36.526 ERROR - Connector: com.mendix.systemwideinterfaces.MendixRuntimeException: com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value     at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:23) Caused by: com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value     at com.fasterxml.jackson.core.JsonGenerator._reportError(JsonGenerator.java:2710)     at com.fasterxml.jackson.core.json.WriterBasedJsonGenerator.writeFieldName(WriterBasedJsonGenerator.java:148)     at com.mendix.webui.jsonserialization.JsonGeneratorWrapper.$anonfun$writeFieldName$1(JsonGeneratorWrapper.scala:38)     at com.mendix.webui.jsonserialization.JsonGeneratorWrapper.$anonfun$writeFieldName$1$adapted(JsonGeneratorWrapper.scala:38)     at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563)     at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561)     at scala.collection.AbstractIterable.foreach(Iterable.scala:926)     at com.mendix.webui.jsonserialization.JsonGeneratorWrapper.writeFieldName(JsonGeneratorWrapper.scala:38)     at com.mendix.webui.jsonserialization.ResultSerializer.$anonfun$generateJsResult$2(ResultSerializer.scala:30)     at com.mendix.webui.jsonserialization.ResultSerializer.$anonfun$generateJsResult$2$adapted(ResultSerializer.scala:29)     at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563)     at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561)     at scala.collection.AbstractIterable.foreach(Iterable.scala:926)     at scala.collection.IterableOps$WithFilter.foreach(Iterable.scala:896)     at com.mendix.webui.jsonserialization.ResultSerializer.generateJsResult(ResultSerializer.scala:29)     at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:111)     at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:79)     at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:37)     at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$1(MxRuntimeConnector.scala:50)     at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$1$adapted(MxRuntimeConnector.scala:50)     at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)     at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.scala:50)     at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.scala:232)     at com.mendix.m2ee.appcontainer.server.handler.RuntimeServlet.service(RuntimeServlet.scala:32)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)     at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)     at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1630)     at org.eclipse.jetty.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:170)     at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)     at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1600)     at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:506)     at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)     at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1571)     at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1378)     at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)     at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:463)     at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1544)     at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)     at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1300)     at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)     at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)     at org.eclipse.jetty.server.Server.handle(Server.java:562)     at org.eclipse.jetty.server.HttpChannel.lambda$handle$0(HttpChannel.java:505)     at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:762)     at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:497)     at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:282)     at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:319)     at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)     at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)     at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:412)     at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:381)     at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:268)     at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.lambda$new$0(AdaptiveExecutionStrategy.java:138)     at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:407)     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:894)     at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1038)     at java.base/java.lang.Thread.run(Thread.java:829)   Kindly give me the solution ASAP.   Thanks, Rasik.N
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1 answers
0

Check your import mapping. This error is telling you is that it received a string where a value was expected. You could set your log node for either the Rest or for Webservices to trace so you can see the traffic and double check what is coming in in your logs.

Regards,

Ronald

 

answered