GitHub Copilot.github/copilot-instructions.md
Copilot Instructions for Java Enterprise Services
Java service conventions for Copilot: immutable-by-default classes, Optional only as a return type, JUnit 5 with AssertJ, and exceptions that carry context instead of being swallowed.
Use when: Use in a Java 17+ backend service when you want Copilot to produce modern, immutable, well-tested Java instead of setter-heavy beans and bare try/catch blocks.
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