Grails 4.0.2 gradle runCommand - exception regarding "domain class defined by different class loader: "

[Milan Zimmermann]

Hi, I am still converting our application from Grails 2.2.0 to 4.0.2

After many many issues solved, I am getting into areas that make me very desperate .. but anyway.

We have some grails scripts (used to run as 'grails run-script') that have lots of database processing, domain classes etc.

Running 

./gradlew runCommand ...-Pargs="load-activity-facts myApp.Application"

I am getting exceptions that go like this:

Command execution error: No signature of method: myOrg.ProcedureSet$_buildUniqueKeyFromProcTypes_closure1.doCall() is applicable for argument types: (myOrg.ServicedCaseProcedureType) values: [myOrg.ServicedCaseProcedureType : (unsaved)]

Possible solutions: doCall(myOrg.ServicedCaseProcedureType), findAll(), findAll(), isCase(java.lang.Object), isCase(java.lang.Object)

The following classes appear as argument class and as parameter class, but are defined by different class loader:

myOrg.ServicedCaseProcedureType (defined by 'org.springframework.boot.devtools.restart.classloader.RestartClassLoader@62a122fb' and 'sun.misc.Launcher$AppClassLoader@39a054a5')

If one of the method suggestions matches the method you wanted to call, 

then check your class loader setup.

Would anyone have any idea how to address it? I am not doing anything special in build.gradle, definitely not trying to manipulate classloaders. Yet, all lines that address, use, or return Domain objects in the code, clearly have some class issues. I was able to "resolve" it until now by removing any declaration of concrete domain members

Organization org // changed to "def org"

to get pass those issues.

But I think this last clearly shows there is a problem. I just have no idea where to start. 

My Command handle is like:

boolean handle() {
    Account.withTransaction { // or withNewSession, either fails the same
        readOrganizationFromEnviroment()
        runActivityFacts()
    }

    return true
}

Anyone have any ideas?

Thank you

PS: I am guessing this is a better forum for this than Slack but can re-post