Comment # 2 on bug 978257 from Simon Lees

I can replicate it here:

simon@tek-top ~ ���  ant -version
Error: Could not find or load main class org.apache.tools.ant.launch.Launcher
Caused by: java.lang.ClassNotFoundException:
org.apache.tools.ant.launch.Launcher
simon@tek-top ~ ���  echo $JAVA_HOME 

simon@tek-top ~ ���  ll /usr/bin/java  
lrwxrwxrwx 1 root root 22 Mar 23  2016 /usr/bin/java -> /etc/alternatives/java
simon@tek-top ~ ���  ll /etc/alternatives/java                                    
lrwxrwxrwx 1 root root 37 May 15 18:04 /etc/alternatives/java ->
/usr/lib64/jvm/jre-9-openjdk/bin/java
simon@tek-top ~ ���