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unable to build on Debian 13 #48

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opened 2025年11月25日 12:53:28 +01:00 by fkooman · 1 comment

It seems because Debian 13 comes with Java 21:

$ javac --version
javac 21.0.9

The builder fails:

> Task :ics-openvpn-main:compileUiOvpn2ReleaseKotlin FAILED 
[Incubating] Problems report is available at: file:///home/debian/Projects/eduvpn-android-3.5.1/build/reports/problems/problems-report.html 
 
FAILURE: Build failed with an exception. 
 
* What went wrong: 
Execution failed for task ':ics-openvpn-main:compileUiOvpn2ReleaseKotlin'. 
> Inconsistent JVM-target compatibility detected for tasks 'compileUiOvpn2ReleaseJavaWithJavac' (17) and 'compileUiOvpn2ReleaseKotlin' (21). 
 
 Consider using JVM Toolchain: https://kotl.in/gradle/jvm/toolchain 
 Learn more about JVM-target validation: https://kotl.in/gradle/jvm/target-validation

Is there anything we can do? Building on Debian 12 works fine:

$ javac --version
javac 17.0.17
It seems because Debian 13 comes with Java 21: ```bash $ javac --version javac 21.0.9 ``` The builder fails: ``` > Task :ics-openvpn-main:compileUiOvpn2ReleaseKotlin FAILED [Incubating] Problems report is available at: file:///home/debian/Projects/eduvpn-android-3.5.1/build/reports/problems/problems-report.html FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':ics-openvpn-main:compileUiOvpn2ReleaseKotlin'. > Inconsistent JVM-target compatibility detected for tasks 'compileUiOvpn2ReleaseJavaWithJavac' (17) and 'compileUiOvpn2ReleaseKotlin' (21). Consider using JVM Toolchain: https://kotl.in/gradle/jvm/toolchain Learn more about JVM-target validation: https://kotl.in/gradle/jvm/target-validation ``` Is there anything we can do? Building on Debian 12 works fine: ```bash $ javac --version javac 17.0.17 ```
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Debian 12 will be EOL on 2026年06月10日, so ideally we'll have a solution before then. No rush.

Debian 12 will be [EOL](https://wiki.debian.org/DebianReleases) on 2026年06月10日, so ideally we'll have a solution before then. No rush.
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