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Here is a checklist of changes you'll need to make to a Groovy classic codebase to ensure compatibility with the new Groovy JSR syntax

  • return is mandatory in all non-void methods
  • return/break/continue to behave inside closures like these statements work in other blocks (such as the block on a for() or while() loop. More details here
  • local variable declarations and fields currently need to be specified with 'def' or a type. e.g.


  • no dumb expression rule, so we will catch dumb expressions (where a carriage return has broken the script). e.g.
  • markup / builders will change a little. Not sure of the syntax, but we'll have some kinda start/stop syntax to denote a markup block. Maybe a keyword, like
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