如何解决MWE2运行生成器时Xtext无法解析JvmType 'Generator'的问题

Hey, let's work through fixing this error in your MWE2 configuration. This issue almost always boils down to classpath resolution or import problems—here's how to tackle it step by step:

1. Double-Check Your Import Statements #

Right now you're using a wildcard import for the Xtext generator package:

import org.eclipse.xtext.generator.*

While this should theoretically include the Generator class, sometimes explicit imports help the MWE2 resolver find the class correctly. Try adding a direct import line alongside the wildcard:

import org.eclipse.xtext.generator.Generator

2. Confirm Your Project Has the Right Dependencies #

If the import looks good, the next check is whether your project can actually access the Generator class at runtime:

• If you're using Eclipse's plugin-based setup, make sure the org.eclipse.xtext.generator bundle is added as a dependency to your MWE2 project. You can check this in Project Properties > Plug-in Development > Dependencies.
• For Maven/Gradle projects, verify that the org.eclipse.xtext:xtext-generator artifact is listed in your build file with a version that matches your Xtext installation.

3. Try Qualifying the Generator Class Directly #

To rule out any import ambiguity, you can reference the Generator by its full package name in your workflow temporarily:

component = org.eclipse.xtext.generator.Generator {
    pathRtProject = runtimeProject
    pathUiProject = "${runtimeProject}.ui"
    projectNameRt = projectName
    projectNameUi = "${projectName}.ui"
    language = {
        uri = grammarURI
        fileExtensions = file.extensions
        fragment = grammarAccess.GrammarAccessFragment {}
    }
}

If this works, it confirms the import statement wasn't being resolved properly, and you can either keep the qualified name or tweak your imports.

4. Clean and Refresh Your Workspace #

Stale build artifacts or cached classpath data can cause weird resolution issues. Do these steps to reset things:

• Go to Project > Clean... in Eclipse and select your projects to clean.
• Rebuild all projects in your workspace.
• Restart Eclipse to ensure the classpath is fully refreshed.

内容的提问来源于stack exchange，提问作者user8585703