Railway Deployment #506047 fix: add jdk21 to nixpacks setup - #2
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Problem
Maven build failed with "release version 21 not supported" because the Nixpacks build environment provisioned JDK 19 despite pom.xml requiring Java 21. The NIXPACKS_JDK_VERSION = "21" variable did not actually cause JDK 21 to be installed.
Solution
Explicitly added "jdk21" to nixPkgs in nixpacks.toml so JDK 21 is installed and placed on the build PATH, and removed the ineffective NIXPACKS_JDK_VERSION variable.
Changes
nixpacks.tomlContext
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