Implement Serializable in BaseLanguage Class

How can I implement Serializable in a class in BaseLanguage?

What I did so far:

• Using JetBrains MPS 3.3.4
• Create new solution Project
• Add new Model
• Add module.JDK@project_stub as Dependency
• Add jetbrains.mps.baseLanguage as Used Language
• Add new Class
• Trigger implements in editor.
• Trigger AutoComplete

The editor now shows a list of available interfaces from java.lang namespace, like Clonable, Comparable and so on. However, there is no Serializable. The same behavior emerges when I try to implement Serializable in a Generator.

Is this a bug or am I missing something?

You perhaps did not import the java.io@java_stub model to your dependencies. Control + M while in the editor will do the job.

Vaclav