OpenRewrite best practices

Apply best practices to OpenRewrite recipes.

Composite Recipes

Recipes that include further recipes, often including the individual recipes below.

• Java Recipe best practices
• Migrate tests to Java 21
• Recipe nullability best practices
• Recipe testing best practices

Recipes

• Add a blank line around fields with annotations
• Automatically select recipe examples from the unit test cases of a recipe
• Correctly spaced descriptions
• Extract documentation examples from tests
• Find OpenRewrite recipes
• Find missing @Option example values
• Minimal indentation for SourceSpecs text blocks
• New line at the end of SourceSpecs text blocks
• Recipe classes should not have mutable static fields
• Refactor RewriteTest to use defaults method
• Refaster template IsLiteralNull
• Replace null with RewriteTest.doesNotExist()
• RewriteTest classes should not be public
• Show @DocumentExamples first
• Single @DocumentExample per test class
• Use Tree.randomId() in LST constructors
• Use a standard name for ExecutionContext
• Use of @EqualsAndHashCode on Recipe