GrEclipse 4.28+ corrupts Groovy method references by formatting `::` as `: : `

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
68/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
groovy
Domain
build-system, tooling

Research direction

Reproduce the minimal Groovy example with Spotless Gradle plugin 8.9.0 and GrEclipse 4.35 or 4.40, then compare it with GrEclipse 4.27. Trace the GrEclipse formatting integration and its tests, if present; done means TestFQNSerializer::serialize remains unchanged and the formatted output compiles.

Written by the indexing model from the issue text.

Description

Minimal report:

s.write(tests, TestFQNSerializer::serialize)

Actual output:

s.write(tests, TestFQNSerializer: : serialize)

The output is invalid Groovy and fails compilation.
Environment
Spotless Gradle plugin: 8.9.0
GrEclipse: reproduced with 4.35 and 4.40
Last known good GrEclipse version: 4.27
Gradle: 9.7.0
Pinning GrEclipse to 4.27 avoids the corruption.

I found no existing issue matching this exact formatting failure.

Dominant language
Java
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