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**Problem** Currently Zinc runs in the same process as the sbt server, which means that the JDK/Java version of the build artifact gets tied to the JDK/Java version used by sbt itself. **Solution** This implements a command-line interface for Zinc, which can be invoked via the worker process. 1. This can be used to compile using JDK 25, if Zinc works on JDK 25. 2. When we upgrade to JDK 17, we can downgrade the compilation to use the real JDK 8, if Zinc itself it compiled with --release 8.
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This was referenced Jan 22, 2026
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Fixes #887
Problem
Currently Zinc runs in the same process as the sbt server, which means that the JDK/Java version of the build artifact gets tied to the JDK/Java version used by sbt itself.
Solution
This implements a command-line interface for Zinc, which can be invoked via the worker process.
--release 8.