How do you get a newer version of Ant to work on on RedHat?
Simply setting ANT_HOME and JAVA_HOME aren’t enough!
Need to add alternatives for applications in RHEL.
sudo alternatives --install /usr/bin/java java /opt/jdk1.8.0_101_x86_64/bin/java
sudo alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_101_x86_64/bin/javac
sudo alternatives --install /usr/bin/ant ant /opt/apache-ant-1.9.7_x86_64/bin/ant
And lastly... rename or modify /etc/ant.conf because by default the ant.conf file is sourced by ant scripts which automatically re-exports ANT_HOME using an older version of ANT.
You can tell this is the case when, for example:
bash-4.1$ ant -version
Apache Ant version 1.7.1 compiled on July 2 2010
bash-4.1$ ant --noconfig -version
Apache Ant(TM) version 1.9.7 compiled on April 9 2016
Now your JAVA_HOME, java -version should match and your ANT_HOME and ant -version should match!
If this doesn't report back the version you expected, confirm they are set as priority in the alternatives:
sudo alternatives --config java
sudo alternatives --config javac
sudo alternatives --config ant