Hello Experts, I have published an API where I enabled basic authentication (username and password) which will authenticate the logged in users and returns the response as “Success” if it is authenticated successfully. Here when I hit the API I am getting an error: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: com.mendix.core.CoreRuntimeException: Exception occurred in action '{"type":"LoginAction","user":"L1"}', all database changes executed by this action were rolled back at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:110) Caused by: com.mendix.systemwideinterfaces.MendixRuntimeException: com.mendix.core.CoreRuntimeException: Exception occurred in action '{"type":"LoginAction","user":"L1"}', all database changes executed by this action were rolled back at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:23) Caused by: com.mendix.core.CoreRuntimeException: Exception occurred in action '{"type":"LoginAction","user":"L1"}', all database changes executed by this action were rolled back at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.processErrorState(CoreActionHandlerImpl.scala:153) Caused by: java.lang.IllegalArgumentException: Invalid UUID string: value at java.base/java.util.UUID.fromString(UUID.java:215) at com.mendix.basis.session.SessionManager.$anonfun$getExistingSession$2(SessionManager.scala:383) at scala.Option.flatMap(Option.scala:283) at com.mendix.basis.session.SessionManager.getExistingSession(SessionManager.scala:383) at com.mendix.basis.session.SessionManager.initializeSession(SessionManager.scala:198) at com.mendix.basis.session.LoginManagerImpl.initializeSession(LoginManagerImpl.scala:92) at com.mendix.basis.action.user.LoginActionHandlerImpl.doExecuteAction(LoginActionHandlerImpl.scala:34) at com.mendix.basis.action.user.LoginActionHandlerImpl.executeAction(LoginActionHandlerImpl.scala:29) at com.mendix.core.action.user.LoginAction.executeAction(LoginAction.java:44) at com.mendix.core.action.user.LoginAction.executeAction(LoginAction.java:11) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:58) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48) at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:56) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.$anonfun$runMonitoredAction$1(CoreActionHandlerImpl.scala:59) at com.mendix.basis.actionmanagement.ActionMonitoring$.$anonfun$monitor$1(ActionMonitoring.scala:49) at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20) at com.mendix.basis.actionmanagement.ActionMonitoring$.monitor(ActionMonitoring.scala:49) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.runMonitoredAction(CoreActionHandlerImpl.scala:59) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:46) at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:56) at com.mendix.basis.actionmanagement.ActionManager.$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.component.ExecutionCore.doExecuteSync(ExecutionCore.scala:147) at com.mendix.basis.component.ExecutionCore.doExecuteSync$(ExecutionCore.scala:146) at com.mendix.basis.component.InternalCore.doExecuteSync(InternalCore.scala:24) at com.mendix.basis.component.SessionCore.login(SessionCore.scala:79) at com.mendix.basis.component.SessionCore.login$(SessionCore.scala:78) at com.mendix.basis.component.InternalCore.login(InternalCore.scala:24) at com.mendix.basis.component.SessionCore.login(SessionCore.scala:129) at com.mendix.basis.component.SessionCore.login(SessionCore.scala:88) at com.mendix.basis.component.SessionCore.login$(SessionCore.scala:87) at com.mendix.basis.component.InternalCore.login(InternalCore.scala:24) at com.mendix.integration.authentication.BasicAuthenticator.$anonfun$authenticate$1(BasicAuthenticator.scala:12) at scala.Option.map(Option.scala:242) at com.mendix.integration.authentication.BasicAuthenticator.authenticate(BasicAuthenticator.scala:10) at com.mendix.integration.authentication.Authenticator.authenticate(Authenticator.scala:28) at com.mendix.integration.authentication.Authenticator.$anonfun$authenticate$1(Authenticator.scala:35) at scala.collection.Iterator$$anon$10.nextCur(Iterator.scala:587) at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:601) at scala.collection.Iterator.nextOption(Iterator.scala:102) at scala.collection.Iterator.nextOption$(Iterator.scala:102) at scala.collection.AbstractIterator.nextOption(Iterator.scala:1293) at com.mendix.integration.util.IteratorUtil$RichIterable$.firstDefined$extension(IteratorUtil.scala:27) at com.mendix.integration.authentication.Authenticator.authenticate(Authenticator.scala:35) at com.mendix.integration.service.rest.RestOperationProcessors.withAuthenticationContext(RestOperationProcessors.scala:153) at com.mendix.integration.service.rest.RestOperationProcessors.$anonfun$operationResponse$3(RestOperationProcessors.scala:123) at com.mendix.integration.service.rest.RestOperationProcessors.operationResponse(RestOperationProcessors.scala:125) at com.mendix.integration.service.rest.RestOperationProcessors.processOperations(RestOperationProcessors.scala:84) at com.mendix.integration.service.rest.RestOperationProcessors.$anonfun$createProcessor$1(RestOperationProcessors.scala:61) at com.mendix.integration.service.PathProcessors.$anonfun$process$1(PathProcessors.scala:32) at scala.collection.Iterator$$anon$10.nextCur(Iterator.scala:587) at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:601) at scala.collection.Iterator.nextOption(Iterator.scala:102) at scala.collection.Iterator.nextOption$(Iterator.scala:102) at scala.collection.AbstractIterator.nextOption(Iterator.scala:1293) at com.mendix.integration.util.IteratorUtil$RichIterable$.firstDefined$extension(IteratorUtil.scala:27) at com.mendix.integration.service.PathProcessors.process(PathProcessors.scala:28) at com.mendix.integration.service.PathProcessors.process$(PathProcessors.scala:27) at com.mendix.integration.service.rest.RestOperationProcessors.process(RestOperationProcessors.scala:41) at com.mendix.integration.requesthandlers.RestRequestHandler.$anonfun$processRequest$1(RestRequestHandler.scala:38) at scala.collection.Iterator$$anon$10.nextCur(Iterator.scala:587) at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:601) at scala.collection.Iterator.nextOption(Iterator.scala:102) at scala.collection.Iterator.nextOption$(Iterator.scala:102) at scala.collection.AbstractIterator.nextOption(Iterator.scala:1293) at com.mendix.integration.util.IteratorUtil$RichIterable$.firstDefined$extension(IteratorUtil.scala:27) at com.mendix.integration.requesthandlers.RestRequestHandler.processRequest(RestRequestHandler.scala:38) at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:37) at com.mendix.external.connector.MxRuntimeConnector.$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$.withContextClassLoader(Runner.scala:20) at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.scala:50) at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.scala:223) at com.mendix.m2ee.appcontainer.server.handler.RuntimeServlet.service(RuntimeServlet.scala:25) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799) at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1631) at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:230) at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1440) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1355) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.Server.handle(Server.java:516) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:487) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:732) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:479) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105) at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:137) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034) at java.base/java.lang.Thread.run(Thread.java:834) Answers are really much appreciated!