Eclipse 4.5.1. (MARS.1) Method not found: setDefaultEditor

Question

I have a plugin that used to work with Eclipse Indigo, Kepler,Luna and Mars (4.5). It supports the Frege programming language ( http://www.frege-lang.org/fregide/ ). It is based on the IMP framework, which is, unfortunately, not maintained anymore (and I don't have the source code).

Tonight I checked for updates, and it found Eclipse 4.5.1. After updating, eclipse had a fancy new splash screen that says "MARS.1".

Yet it can't initialize the plugin anymore!

In the Error Log, I get the message:

Plug-in "frege.ide" was unable to instantiate class "frege.imp.builders.FregeBuilder".

and the stack trace seems to indicate that some method has vanished from the Eclipse API:

java.lang.NoSuchMethodError: org.eclipse.ui.internal.registry.FileEditorMapping.setDefaultEditor(Lorg/eclipse/ui/internal/registry/EditorDescriptor;)V
    at org.eclipse.imp.language.LanguageRegistry.addUniversalEditorMappings(LanguageRegistry.java:393)
    at org.eclipse.imp.language.LanguageRegistry.initializeRegistryAsNeeded(LanguageRegistry.java:268)
    at org.eclipse.imp.language.LanguageRegistry.findLanguage(LanguageRegistry.java:206)
    at frege.imp.builders.FregeBuilderBase.<clinit> (FregeBuilderBase.java:53)
    ...

Here are my questions:

1. Does anybody know why this method is gone?
2. How can I restrict installation of my plugin to LUNA, KEPLER and INDIGO only?
3. Would it be possible to supply a fake setDefaultEditor method that does whatever must be done now to register the Editor for the plugin?

Answer 1

The setDefaultEditor method does still exist in FileEditorMapping but it now takes an IEditorDescriptor argument instead of EditorDescriptor . This will cause the NoSuchMethodError . Since this class is an internal class and therefore not part of the API this is a valid change.

According to the IMP Wiki the IMP project has moved to a github project , you may be able to get up to date code from there (or at least get the source).