Error in starting runtime after Upgrade

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Hi all,    I have an application in Mendix Studio Pro 10.18.4, I had to upgrade it to 10.21.0, I did that with the Upgrade Solution button, but after merging the changes and solving the conflicts I can't start my application because I get this error:   java.lang.IllegalArgumentException: requirement failed: MicroflowActionRegistry does not contain class 'com.mendix.model.microflows.ModelNanoflowCallAction'.    at scala.Predef$.require(Predef.scala:337)    at com.mendix.modules.microflowengine.actions.impl.MicroflowActionRegistry.createMicroflowAction(MicroflowActionRegistry.scala:33)    at com.mendix.modules.microflowengine.actions.impl.MicroflowActionBuilder.createMicroflowAction(MicroflowActionBuilder.scala:24)    at com.mendix.modules.microflowengine.microflowstructure.MicroflowStructureFactory.processActivity(MicroflowStructureFactory.scala:196)    at com.mendix.modules.microflowengine.microflowstructure.MicroflowStructureFactory.$anonfun$createMicroflowStructure$1(MicroflowStructureFactory.scala:47)    at scala.collection.immutable.Vector.foreach(Vector.scala:2125)    at com.mendix.modules.microflowengine.microflowstructure.MicroflowStructureFactory.createMicroflowStructure(MicroflowStructureFactory.scala:40)    at com.mendix.modules.microflowengine.internal.MicroflowEngineModuleImpl.$anonfun$reload$2(MicroflowEngineModuleImpl.scala:38)    at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:619)    at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:617)    at scala.collection.AbstractIterable.foreach(Iterable.scala:935)    at scala.collection.IterableOps$WithFilter.foreach(Iterable.scala:905)    at com.mendix.modules.microflowengine.internal.MicroflowEngineModuleImpl.reload(MicroflowEngineModuleImpl.scala:37)    at com.mendix.basis.impl.MxRuntimeImpl.initializeMicroflowEngine(MxRuntimeImpl.scala:900)    at com.mendix.basis.impl.MxRuntimeImpl.doStart(MxRuntimeImpl.scala:855)    at com.mendix.basis.impl.MxRuntimeImpl$Starting$.$anonfun$onEntry$17(MxRuntimeImpl.scala:537)    at com.mendix.basis.impl.MxRuntimeImpl.com$mendix$basis$impl$MxRuntimeImpl$$onFailureTransitionTo(MxRuntimeImpl.scala:329)    at com.mendix.basis.impl.MxRuntimeImpl$Starting$.onEntry(MxRuntimeImpl.scala:537)    at com.mendix.basis.impl.MxRuntimeImpl.enter(MxRuntimeImpl.scala:324)    at com.mendix.basis.impl.MxRuntimeImpl.com$mendix$basis$impl$MxRuntimeImpl$$transitionTo(MxRuntimeImpl.scala:315)    at com.mendix.basis.impl.MxRuntimeImpl$Idle$.start(MxRuntimeImpl.scala:342)    at com.mendix.basis.impl.MxRuntimeImpl.$anonfun$start$1(MxRuntimeImpl.scala:204)    at scala.runtime.java8.JFunction0$mcZ$sp.apply(JFunction0$mcZ$sp.scala:17)    at com.mendix.util.startupmeter.StartUpMeter.measure(StartUpMeter.scala:67)    at com.mendix.basis.impl.MxRuntimeImpl.start(MxRuntimeImpl.scala:203)    at com.mendix.m2ee.appcontainer.AppContainer.startRuntime(AppContainer.scala:363)    at com.mendix.m2ee.appcontainer.actions.StartAction.execute(StartAction.scala:16)    at com.mendix.m2ee.appcontainer.server.handler.HttpAdminHandlerBase.service(HttpAdminHandlerBase.java:131)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)    at org.eclipse.jetty.ee8.servlet.ServletHolder.handle(ServletHolder.java:640)    at org.eclipse.jetty.ee8.servlet.ServletHandler.doHandle(ServletHandler.java:456)    at org.eclipse.jetty.ee8.nested.ScopedHandler.nextHandle(ScopedHandler.java:181)    at org.eclipse.jetty.ee8.nested.ContextHandler.doHandle(ContextHandler.java:885)    at org.eclipse.jetty.ee8.nested.ScopedHandler.nextScope(ScopedHandler.java:152)    at org.eclipse.jetty.ee8.servlet.ServletHandler.doScope(ServletHandler.java:423)    at org.eclipse.jetty.ee8.nested.ScopedHandler.nextScope(ScopedHandler.java:150)    at org.eclipse.jetty.ee8.nested.ContextHandler.doScope(ContextHandler.java:830)    at org.eclipse.jetty.ee8.nested.ScopedHandler.handle(ScopedHandler.java:117)    at org.eclipse.jetty.ee8.nested.ContextHandler.handle(ContextHandler.java:1443)    at org.eclipse.jetty.ee8.nested.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1289)    at org.eclipse.jetty.ee8.nested.HttpChannel.dispatch(HttpChannel.java:616)    at org.eclipse.jetty.ee8.nested.HttpChannel.handle(HttpChannel.java:459)    at org.eclipse.jetty.ee8.nested.ContextHandler$CoreContextHandler$CoreToNestedHandler.handle(ContextHandler.java:2450)    at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1064)    at org.eclipse.jetty.server.Server.handle(Server.java:182)    at org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run(HttpChannelState.java:662)    at org.eclipse.jetty.server.internal.HttpConnection.onFillable(HttpConnection.java:416)    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:322)    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:99)    at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:480)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:443)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:293)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:201)    at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:311)    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:979)    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1209)    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1164)    at java.base/java.lang.Thread.run(Thread.java:1583)   Do anybody know why is this happening and how can I solve it?    Thanks!    Gabriele
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1 answers
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Hi Gabriele,

This error usually happens when upgrading older Mendix versions because some deprecated modules or actions are no longer supported in the new runtime.

In your stacktrace, the key part is:

java.lang.IllegalArgumentException: requirement failed:

microflow action com.mendix.modules.microflowengine.actions.MicroflowCallAction

does not contain class scala.collection.immutable.$colon$colon

This indicates that something inside your project is still referencing the old MicroflowEngine actions, possibly coming from:

A module that needs re-import after upgradeA custom Java action that depends on outdated Mendix librariesIncompatible Marketplace modules (like CommunityCommons older version)

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Steps:

1. Update Marketplace modules

At least update CommunityCommons, Encryption, Email, etc., to versions supporting 10.21.x

2. Clean & rebuild project

App Menu → Clean Deployment Folder

Then run again

3. Recompile Java actions

App Menu → Build → Deploy for Eclipse

Open in Eclipse and clean the Java project (remove old jars if added manually)

4. If still stuck → check version mismatch of .jar libraries under:

project_directory\javasource\lib

Remove any old scala-related .jars if present.

Note:

After upgrading to a major version, always refresh:

Module updates → Java actions → Rebuild → Clean Deployment

 

answered