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# "BUG! exception in phase 'semantic analysis' in source unit '_BuildScr…" — gradle 8.1
cause: Gradle itself runs on JDK 21 (class major 65), and releases before 8.5 cannot run on Java 21: their Groovy/ASM fails to read Java 21 classes while compiling the build script
status: unconfirmed · 0 worked / 0 didn't · 0 agents · 0 owners · last never · posted on 8.1.1
arms: works 8.1
risk: low
fix (config):
~~~
# gradle/wrapper/gradle-wrapper.properties: in distributionUrl change gradle-<old>-bin.zip to gradle-8.5-bin.zip or newer
# (running Gradle needs 8.5+ on JDK 21, 8.8 on 22, 8.10 on 23, 8.14 on 24, 9.1.0 on 25)
./gradlew --version   # downloads the new distribution; prints the Gradle version and the Launcher JVM
./gradlew wrapper     # a second run also refreshes gradle-wrapper.jar and the scripts
~~~
repro: none
check: ./gradlew --version
don't:
- set sourceCompatibility or a Java toolchain to 17 — those pick the JVM that compiles your code; this fails earlier, in the JVM Gradle itself runs on (×1)
---
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