GROOVY-11978: RootLoader duplicates the core jar already on the boots…

[paulk-asert]

…trap classpath

https://issues.apache.org/jira/browse/GROOVY-11978

[codecov-commenter]

Codecov Report

❌ Patch coverage is 38.88889% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.2223%. Comparing base (8dde1c8) to head (54bcbd4).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...ain/java/org/codehaus/groovy/tools/RootLoader.java	38.8889%	8 Missing and 3 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2504        +/-   ##
==================================================
- Coverage     67.2264%   67.2223%   -0.0041%     
- Complexity      31984      31987         +3     
==================================================
  Files            1468       1468                
  Lines          123923     123944        +21     
  Branches        22251      22258         +7     
==================================================
+ Hits            83309      83318         +9     
- Misses          33433      33439         +6     
- Partials         7181       7187         +6     

Files with missing lines	Coverage Δ
...ain/java/org/codehaus/groovy/tools/RootLoader.java	45.0000% <38.8889%> (-1.5116%)	⬇️

... and 6 files with indirect coverage changes

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Pull request overview

Addresses GROOVY-11978 by preventing RootLoader from re-adding core Groovy JARs that are already present on the JVM’s startup classpath, avoiding duplicate class/resource definitions.

Changes:

• Compute a canonicalized set of files from java.class.path.
• Skip adding LoaderConfiguration URLs that resolve to files already present on that startup classpath.
• Add helper methods to canonicalize URL/File entries for reliable comparisons.