I am facing the same issue big sure 11.2.3 version Some times it detects sometime not... Depends totally on my system mood

I Faced the similar issue, Javajome previously set on Catalina OS wasn't working anymore when I upgraded to Big Sur. though the below commands worked for me  /usr/libexec/java_home -V /usr/libexec/java_home -v "1.8.0_241"  export JAVA_HOME=$(/usr/libexec/java_home -v "1.8.0_241")  echo $JAVA_HOME