unable to map requested Java version of "21" to a UBI supported runtime

[cmoulliard]

Issue

We got this error during a build using the UBI8 Builder image

2025-05-14T18:06:14+02:00 Paketo UBI Java Extension 0.2.0
2025-05-14T18:06:14+02:00
2025-05-14T18:06:14+02:00   Build Configuration:
2025-05-14T18:06:14+02:00     $BP_JVM_VERSION  "21"  the Java version
2025-05-14T18:06:14+02:00     Using Java version "21" from BP_JVM_VERSION
2025-05-14T18:06:14+02:00
2025-05-14T18:06:14+02:00 Paketo UBI Java Extension 0.2.0
2025-05-14T18:06:14+02:00   error invoking dockerfile callback
2025-05-14T18:06:14+02:00   unable to obtain ubi package/runtime
2025-05-14T18:06:14+02:00   unable to map requested Java version of "21" to a UBI supported runtime
2025-05-14T18:06:14+02:00 Timer: Generator ran for 44.466432ms and ended at 2025-05-14T16:06:14Z
2025-05-14T18:06:14+02:00 ERROR: failed to build: exit status 1

when we set the env var using double quotes

BP_JVM_VERSION="21"

The error is gone using

BP_JVM_VERSION=21