The error occurs when running MWE2 for the Xtext grammar, based on the Xtend model

The problem occurred in eclipse package "eclipse-dsl-2023-12-R" (windows/linux x64, xtend 2.33)

MW2 is reported (exception indicating a problem):
Caused by: java.lang.NoClassDefFoundError: org/slf4j/Logger

An example of projects to reproduce the problem is available in the public repository
https://github.com/fedorov-vk/xtext-xcore-sample.git

To simplest avoid the MW2 execution error,

• it is enough to add to MANIFEST.MF of org.example.library:
  Import-Package: org.slf4j
• or adding as external JAR the slf4j.api_2.0.9.jar into MWE2 launch configuration.

Follows is a little investigation.

1. First sequence of calls, what is caused error.
   bundle: org.eclipse.xtext.xtext.generator_2.33.0.v20231121-0955.jar
   method: XtextGeneratorResourceSetInitializer.ensureResourceCanBeLoaded()
   call: xcore.getDeclaredMethod("doSetup", new Class[] {} ).invoke(null);

2. Next, call doSetup:
   bundle: org.eclipse.emf.ecore.xcore_1.27.0.v20231007-1413.jar
   method: XcoreStandaloneSetup.doSetup

3. Method doSetup - uses bundle: com.google.inject_7.0.0.jar
   Google.inject - generates the above exception.

Reproduce the failure with the linked xtext-xcore-sample project and the eclipse-dsl-2023-12-R package. Trace XtextGeneratorResourceSetInitializer.ensureResourceCanBeLoaded() into XcoreStandaloneSetup.doSetup and the Google Guice call, then inspect how org.slf4j.Logger is resolved for the MWE2 launch. Done means the reported MWE2 generation path no longer fails with NoClassDefFoundError without relying on the documented manual workaround.