Error on update document with mendix

While trying to update a pdf in mendix the java action returns an illegal argument exception.

com.mendix.modules.microflowengine.MicroflowException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.IllegalArgumentException: The given object is not a WebViewer.File
at WebViewer.updateDocument (JavaAction : ‘UpdateDocument’)

Advanced stacktrace:
at com.mendix.modules.microflowengine.MicroflowUtil.processException(MicroflowUtil.java:83)

Caused by: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.IllegalArgumentException: The given object is not a WebViewer.File
at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:110)

Caused by: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.IllegalArgumentException: The given object is not a WebViewer.File
at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:23)

Caused by: java.lang.IllegalArgumentException: The given object is not a WebViewer.File
at webviewer.proxies.File.(File.java:52)
at webviewer.proxies.File.initialize(File.java:74)
at webviewer.proxies.File.load(File.java:80)
at webviewer.actions.UpdateDocument.executeAction(UpdateDocument.java:42)
at webviewer.actions.UpdateDocument.executeAction(UpdateDocument.java:20)
at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:58)
at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71)
at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48)
at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:57)
at com.mendix.basis.actionmanagement.ActionManager.$anonfun$executeSync$2(ActionManager.scala:106)
at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)
at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:105)
at com.mendix.basis.actionmanagement.UserActionCallBuilderImpl.execute(UserActionCallBuilderImpl.scala:57)
at com.mendix.modules.microflowengine.actions.actioncall.ForegroundJavaAction.doExecute(ForegroundJavaAction.scala:35)
at com.mendix.modules.microflowengine.actions.actioncall.ForegroundJavaAction.doExecute(ForegroundJavaAction.scala:11)
at com.mendix.modules.microflowengine.actions.actioncall.JavaAction.execute(JavaAction.scala:38)
at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.$anonfun$execute$1(MicroflowObject.scala:32)
at scala.Option.flatMap(Option.scala:283)
at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.scala:29)
at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.$anonfun$executeAfterBreakingIfNecessary$2(MicroflowImpl.scala:167)
at scala.Option.flatMap(Option.scala:283)
at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.scala:167)
at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.scala:114)
at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:58)
at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71)
at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48)
at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:57)
at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.$anonfun$runMonitoredAction$1(CoreActionHandlerImpl.scala:59)
at com.mendix.basis.actionmanagement.ActionMonitoring$.$anonfun$monitor$1(ActionMonitoring.scala:52)
at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)
at com.mendix.basis.actionmanagement.ActionMonitoring$.monitor(ActionMonitoring.scala:52)
at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.runMonitoredAction(CoreActionHandlerImpl.scala:59)
at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:46)
at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:57)
at com.mendix.basis.actionmanagement.ActionManager.$anonfun$executeSync$2(ActionManager.scala:106)
at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)
at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:105)
at com.mendix.basis.actionmanagement.MicroflowCallBuilderImpl.execute(MicroflowCallBuilderImpl.scala:62)
at com.mendix.integration.internal.InternalIntegration.$anonfun$executeMicroflow$3(InternalIntegration.scala:72)
at scala.util.Try$.apply(Try.scala:210)
at com.mendix.integration.internal.InternalIntegration.executeMicroflow(InternalIntegration.scala:72)
at com.mendix.integration.internal.InternalIntegration.executeMicroflow$(InternalIntegration.scala:66)
at com.mendix.integration.internal.InternalIntegrationImpl.executeMicroflow(InternalIntegrationImpl.scala:39)
at com.mendix.integration.rest.publish.RestOperationProcessors.$anonfun$executeMicroflow$1(RestOperationProcessors.scala:234)
at scala.util.Try$.apply(Try.scala:210)
at com.mendix.integration.rest.publish.RestOperationProcessors.executeMicroflow(RestOperationProcessors.scala:231)
at com.mendix.integration.rest.publish.RestOperationProcessors.$anonfun$getMicroflowResult$1(RestOperationProcessors.scala:202)
at scala.util.Success.flatMap(Try.scala:258)
at com.mendix.integration.rest.publish.RestOperationProcessors.getMicroflowResult(RestOperationProcessors.scala:202)
at com.mendix.integration.rest.publish.RestOperationProcessors.$anonfun$operationResponse$5(RestOperationProcessors.scala:133)
at com.mendix.basis.actionmanagement.ActionMonitoring$.$anonfun$monitor$1(ActionMonitoring.scala:52)
at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)
at com.mendix.basis.actionmanagement.ActionMonitoring$.monitor(ActionMonitoring.scala:52)
at com.mendix.integration.rest.publish.RestOperationProcessors.$anonfun$operationResponse$4(RestOperationProcessors.scala:131)
at com.mendix.integration.rest.publish.RestOperationProcessors.withAuthenticationContext(RestOperationProcessors.scala:165)
at com.mendix.integration.rest.publish.RestOperationProcessors.$anonfun$operationResponse$3(RestOperationProcessors.scala:127)
at com.mendix.integration.rest.publish.RestOperationProcessors.operationResponse(RestOperationProcessors.scala:129)
at com.mendix.integration.rest.publish.RestOperationProcessors.processOperations(RestOperationProcessors.scala:88)
at com.mendix.integration.rest.publish.RestOperationProcessors.$anonfun$createProcessor$1(RestOperationProcessors.scala:65)
at com.mendix.integration.rest.publish.PathProcessors.$anonfun$process$1(PathProcessors.scala:35)
at scala.collection.Iterator$$anon$10.nextCur(Iterator.scala:594)
at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:608)
at scala.collection.Iterator.nextOption(Iterator.scala:102)
at scala.collection.Iterator.nextOption$(Iterator.scala:102)
at scala.collection.AbstractIterator.nextOption(Iterator.scala:1300)
at com.mendix.integration.util.IteratorUtil$RichIterable$.firstDefined$extension(IteratorUtil.scala:27)
at com.mendix.integration.rest.publish.PathProcessors.process(PathProcessors.scala:31)
at com.mendix.integration.rest.publish.PathProcessors.process$(PathProcessors.scala:30)
at com.mendix.integration.rest.publish.RestOperationProcessors.process(RestOperationProcessors.scala:45)
at com.mendix.integration.requesthandlers.RestRequestHandler.$anonfun$processRequest$1(RestRequestHandler.scala:42)
at scala.collection.Iterator$$anon$10.nextCur(Iterator.scala:594)
at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:608)
at scala.collection.Iterator.nextOption(Iterator.scala:102)
at scala.collection.Iterator.nextOption$(Iterator.scala:102)
at scala.collection.AbstractIterator.nextOption(Iterator.scala:1300)
at com.mendix.integration.util.IteratorUtil$RichIterable$.firstDefined$extension(IteratorUtil.scala:27)
at com.mendix.integration.requesthandlers.RestRequestHandler.processRequest(RestRequestHandler.scala:42)
at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:37)
at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$1(MxRuntimeConnector.scala:54)
at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$1$adapted(MxRuntimeConnector.scala:54)
at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)
at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.scala:54)
at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.scala:221)
at com.mendix.m2ee.appcontainer.server.handler.RuntimeServlet.service(RuntimeServlet.scala:40)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)
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$Chain.doFilter(ServletHandler.java:1635)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1570)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1383)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1543)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1305)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
at org.eclipse.jetty.server.Server.handle(Server.java:563)
at org.eclipse.jetty.server.HttpChannel.lambda$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:314)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:416)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:385)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:272)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.lambda$new$0(AdaptiveExecutionStrategy.java:140)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:934)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1078)
at java.base/java.lang.Thread.run(Thread.java:829)

Based on the following error message:

The given object is not a WebViewer.File

It seems that the object that WebViewer is submitting to the API does not appear to be creating the right entity type. WebViewer should submit a document ID and document data to be updated in Mendix. The workflow should create a File entity as provided by the WebViewer Module.

Could you please verify that your changes are inline with what the APIs expect? If not, you could change those parameters to use your entities.