luontola/retrolambda

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

3514 stars · 226 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Retrolambda is a Java bytecode transformation tool that backports Java 8 lambda expressions, method references, and try-with-resources to Java 7, 6, or 5 runtimes. It can be run as a Maven plugin, Gradle plugin, or command-line application, producing plain .class files with no runtime dependencies.

Use cases

• run java 8 lambdas on java 7
• backport lambda expressions to older jvm
• use method references on java 6
• make java 8 code run on android
• transform compiled bytecode for legacy java runtimes
• backport try-with-resources to java 5

When to choose

• you must target old Java 5-7 runtimes but want modern Java 8 syntax
• you maintain legacy Android projects without built-in Java 8 desugaring
• you need zero runtime dependencies after transformation

When to avoid

• you target Java 8+ runtimes where lambdas work natively
• you use Android Studio, which has built-in Java 8 support
• you need backported Java 8 APIs like streams or java.time (use streamsupport or ThreeTen instead)

Facets

library · maturity maintenance

compiler build-tool developer-tools programming-languages compilers developer-tools mobile-development jvm cli bytecode-transformation java-8-backport lambdas maven-plugin gradle-plugin android

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