run fails with JDK21 (outside containers)

[jmtd]

$ mvn -version
Apache Maven 3.9.9
$ java -version
openjdk version "21.0.10" 2026-01-20
OpenJDK Runtime Environment (build 21.0.10+7-Debian-1deb13u1)
OpenJDK 64-Bit Server VM (build 21.0.10+7-Debian-1deb13u1, mixed mode, sharing)
$ mvn clean test -P 25 -P smoke
...
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:testCompile (default-testCompile) on project test-openjdk: Fatal error compiling: java.lang.NoSuchFieldError: Class com.sun.tools.javac.tree.JCTree$JCImport does not have member field 'com.sun.tools.javac.tree.JCTree qualid' -> [Help 1]

whereas,

$ export JAVA_HOME=~/rh/AdoptOpenJDK/jdk-11.0.21+9
$ $JAVA_HOME/bin/java -version
openjdk version "11.0.21" 2023-10-17
OpenJDK Runtime Environment Temurin-11.0.21+9 (build 11.0.21+9)
OpenJDK 64-Bit Server VM Temurin-11.0.21+9 (build 11.0.21+9, mixed mode)
$ mvn clean test -P 25 -P smoke
...
[INFO] BUILD SUCCESS