Domain-Specific Languages (DSLs)

DSL work in Java is mostly about interface design: deciding whether the domain should read like a fluent API inside Java or like an external language with its own parser and tooling.

Use these pages to compare internal and external DSL choices, understand parser-generator trade-offs, and see where DSLs improve clarity instead of hiding ordinary business rules behind clever syntax.

In this section

• Creating Internal DSLs in Java
  Design fluent Java APIs that read like a domain language without turning configuration or validation rules into opaque builder chains.
• External DSLs and Parser Generators in Java
  Build or evaluate external DSLs in Java with parser generators such as ANTLR when a domain needs its own syntax and tooling.
• DSL Examples in Java
  Review Java DSL examples such as Gradle, query builders, and test DSLs to see where internal or external syntax pays off.