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Dev tools · October 10, 2023

SJ

Standalone Jdk.compiler, Java Compiler Framework and Tree API

With this standalone compiler, you can rely on all Java 11 javac features to be available, even when using newer Java versions. Specifically, this allows you to: - compile code even if your Java environment isn't a full JDK (Java JRE, for example!) - target Java 1.7 for compilation without any warnings or restrictions. - use the Compiler Tree API without resorting to --add-opens trickery that may eventually fail in newer Java releases - build a modified compiler with additional features or custom tweaks I made this after finding that the otherwise superb "jsweet" Java-to-JavaScript…

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In plain words

Standalone Jdk.compiler is a standalone Java compiler that provides Java 11 javac features independently of the Java version running it. It enables compilation in non-JDK environments like Java JRE, targets Java 1.7 without warnings, offers access to the Compiler Tree API without workarounds, and allows building customized compilers with additional features. Developers can use it to compile Java code reliably across different Java runtime versions.

written from the facts on this page · September 2026

From the sources

In the maker’s words, at launch

With this standalone compiler, you can rely on all Java 11 javac features to be available, even when using newer Java versions. Specifically, this allows you to: - compile code even if your Java environment isn't a full JDK (Java JRE, for example!) - target Java 1.7 for compilation without any warnings or restrictions. - use the Compiler Tree API without resorting to --add-opens trickery that may eventually fail in newer Java releases - build a modified compiler with additional features or custom tweaks I made this after finding that the otherwise superb "jsweet" Java-to-JavaScript transpiler failed to build and run with Java 16 or newer. Surprisingly, I couldn't find any prior work other than "proper" standalone compilers like Eclipse's ecj that would properly work with modern Java runtimes. I'm excited to see what can be done now that we have this scaffolding.

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