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I’m trying to complete the “Extending Business Logic” section of the Crash course in the Academy. I did everything exactly like the training indicated, but when I hit the “Plan Shifts” button I get the following message on the app: In Studio I can see the following error log: Details: For clarity, that button runs the following Microflow: I debugged it and made sure the error is thrown in the “Shift Planner” Java action. Studio version is 8.11 (not 8.10.3).   EDIT (after Robert Price’s advice)   This is the first error message (I had only posted the second one): Full stack trace: com.mendix.modules.microflowengine.MicroflowException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.IllegalArgumentException: Unmarshalling of solverConfigResource (solver.xml) fails on line number (4). Maybe the classname on line number (4) is surrounded by whitespace, which is invalid. at UserManager.Act_Shift_Plan (JavaAction : 'Shift Planner') Advanced stacktrace: at com.mendix.modules.microflowengine.MicroflowUtil.processException(MicroflowUtil.java:154) Caused by: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.IllegalArgumentException: Unmarshalling of solverConfigResource (solver.xml) fails on line number (4). Maybe the classname on line number (4) is surrounded by whitespace, which is invalid. at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:156) Caused by: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.IllegalArgumentException: Unmarshalling of solverConfigResource (solver.xml) fails on line number (4). Maybe the classname on line number (4) is surrounded by whitespace, which is invalid. at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:30) Caused by: java.lang.IllegalArgumentException: Unmarshalling of solverConfigResource (solver.xml) fails on line number (4). Maybe the classname on line number (4) is surrounded by whitespace, which is invalid. at org.optaplanner.core.config.solver.SolverConfig.createFromXmlResource(SolverConfig.java:117) at org.optaplanner.core.config.solver.SolverConfig.createFromXmlResource(SolverConfig.java:87) at usermanager.actions.Java_Planner.executeAction(Java_Planner.java:54) at usermanager.actions.Java_Planner.executeAction(Java_Planner.java:25) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:49) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:54) at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:147) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:152) at com.mendix.basis.actionmanagement.UserActionCallBuilderImpl.execute(UserActionCallBuilderImpl.scala:30) at com.mendix.modules.microflowengine.actions.actioncall.JavaAction.execute(JavaAction.scala:56) at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:50) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:217) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:167) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:49) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:54) at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:147) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:152) at com.mendix.basis.actionmanagement.MicroflowCallBuilderImpl.execute(MicroflowCallBuilderImpl.scala:40) at com.mendix.webui.actions.client.ExecuteMicroflowAction.runMicroflow(ExecuteMicroflowAction.scala:76) at com.mendix.webui.actions.client.ExecuteMicroflowAction.$anonfun$apply$3(ExecuteMicroflowAction.scala:42) at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:29) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.$anonfun$apply$4(RegularClientAction.scala:55) at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:35) at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:32) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.withState(RegularClientAction.scala:45) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:53) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:45) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:43) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:22) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:109) at scala.util.Try$.apply(Try.scala:213) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:109) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:107) at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$5(ContextHandling.scala:47) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor(IMonitoredAction.scala:49) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor$(IMonitoredAction.scala:25) at com.mendix.webui.requesthandling.helpers.ContextHandling$ClientMonitoredAction.monitor(ContextHandling.scala:59) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:47) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:27) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:24) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:19) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:107) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10) at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:81) at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:46) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:76) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:73) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:79) at com.mendix.basis.impl.MxRuntimeImplBase.processRequest(MxRuntimeImplBase.java:931) at com.mendix.m2ee.appcontainer.server.handler.RuntimeHandler.service(RuntimeHandler.java:42) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:755) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:547) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1300) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1215) 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:500) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: com.thoughtworks.xstream.converters.ConversionException: Cannot load java class usermanager.impl.ShiftSolution ---- Debugging information ---- message : Cannot load java class usermanager.impl.ShiftSolution class : java.lang.Class required-type : java.lang.Class converter-type : com.thoughtworks.xstream.converters.SingleValueConverterWrapper wrapped-converter : com.thoughtworks.xstream.converters.extended.JavaClassConverter line number : 4 class[1] : org.optaplanner.core.config.solver.SolverConfig required-type[1] : org.optaplanner.core.config.solver.SolverConfig converter-type[1] : com.thoughtworks.xstream.converters.reflection.ReflectionConverter version : 1.4.11.1 ------------------------------- at com.thoughtworks.xstream.converters.extended.JavaClassConverter.fromString(JavaClassConverter.java:71) at com.thoughtworks.xstream.converters.SingleValueConverterWrapper.fromString(SingleValueConverterWrapper.java:41) at com.thoughtworks.xstream.converters.SingleValueConverterWrapper.unmarshal(SingleValueConverterWrapper.java:49) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:499) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:425) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:277) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:72) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134) at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1487) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1467) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1338) at org.optaplanner.core.config.solver.SolverConfig.createFromXmlReader(SolverConfig.java:202) at org.optaplanner.core.config.solver.SolverConfig.createFromXmlInputStream(SolverConfig.java:176) at org.optaplanner.core.config.solver.SolverConfig.createFromXmlResource(SolverConfig.java:112) at org.optaplanner.core.config.solver.SolverConfig.createFromXmlResource(SolverConfig.java:87) at usermanager.actions.Java_Planner.executeAction(Java_Planner.java:54) at usermanager.actions.Java_Planner.executeAction(Java_Planner.java:25) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:49) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:54) at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:147) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:152) at com.mendix.basis.actionmanagement.UserActionCallBuilderImpl.execute(UserActionCallBuilderImpl.scala:30) at com.mendix.modules.microflowengine.actions.actioncall.JavaAction.execute(JavaAction.scala:56) at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:50) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:217) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:167) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:49) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:54) at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:147) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:152) at com.mendix.basis.actionmanagement.MicroflowCallBuilderImpl.execute(MicroflowCallBuilderImpl.scala:40) at com.mendix.webui.actions.client.ExecuteMicroflowAction.runMicroflow(ExecuteMicroflowAction.scala:76) at com.mendix.webui.actions.client.ExecuteMicroflowAction.$anonfun$apply$3(ExecuteMicroflowAction.scala:42) at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:29) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.$anonfun$apply$4(RegularClientAction.scala:55) at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:35) at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:32) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.withState(RegularClientAction.scala:45) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:53) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:45) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:43) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:22) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:109) at scala.util.Try$.apply(Try.scala:213) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:109) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:107) at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$5(ContextHandling.scala:47) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor(IMonitoredAction.scala:49) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor$(IMonitoredAction.scala:25) at com.mendix.webui.requesthandling.helpers.ContextHandling$ClientMonitoredAction.monitor(ContextHandling.scala:59) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:47) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:27) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:24) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:19) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:107) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10) at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:81) at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:46) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:76) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:73) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:79) at com.mendix.basis.impl.MxRuntimeImplBase.processRequest(MxRuntimeImplBase.java:931) at com.mendix.m2ee.appcontainer.server.handler.RuntimeHandler.service(RuntimeHandler.java:42) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:755) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:547) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1300) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1215) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.Server.handle(Server.java:500) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) at java.base/java.lang.Thread.run(Thread.java:834) Which leads me to some typos given by the Crash course itself in solver.xml, with usermanager.impl instead of usermanager_impl: <?xml version="1.0" encoding="UTF-8" ?> <solver> <!-- Define the model --> <solutionClass>usermanager_impl.ShiftSolution</solutionClass> <entityClass>usermanager_impl.OptaShift</entityClass> <!-- Define the score function --> <scoreDirectorFactory> <scoreDrl>constraints.drl</scoreDrl> </scoreDirectorFactory> <termination> <secondsSpentLimit>10</secondsSpentLimit> </termination> </solver> So I fixed that and tried again. Now I get:     EDIT 2     I realized there’s a problem with constraints.drl too (same typo): package com.mendix.academy; dialect "java" import org.optaplanner.core.api.score.buildin.hardsoft.HardSoftScoreHolder; import usermanager_impl.OptaShift; import usermanager_impl.OptaEmployee; global HardSoftScoreHolder scoreHolder; // ##################################################################################################################### // Hard constraints // ##################################################################################################################### rule "Required skill for a shift" when $shift: OptaShift(employee != null, hasRequiredSkill() == false) then scoreHolder.addHardConstraintMatch(kcontext, -1); end rule "One shift per employee" when OptaShift($leftId: shiftId, $employee : employee, $employee != null) OptaShift(employee == $employee, shiftId > $leftId) then scoreHolder.addHardConstraintMatch(kcontext, -1); end rule "No overlapping shifts" when $shift_1 : OptaShift(employee != null, $employee : employee, $firstStartDateTime : startDateTime, $firstEndDateTime : endDateTime) $shift_2 : OptaShift(employee == $employee, $firstStartDateTime <= endDateTime, $firstEndDateTime >= startDateTime) then scoreHolder.addHardConstraintMatch(kcontext, -1); end rule "Assign every shift" when OptaShift(employee == null) then scoreHolder.addHardConstraintMatch(kcontext, -1); end And now it got passed. Thanks Robert for the help!

asked 2020-08-04

0 answers