[Ant] java.lang.UnsupportedClassVersionError: com/sun/tools/javac/Main : Unsupported major.minor version 52.0

Problem
When I use Ant 1.10.1 to build my Java project, it occurs error as bellows:

java.lang.UnsupportedClassVersionError: org/apache/tools/ant/launch/Launcher : Unsupported major.minor version 52.0

How-To
The problem is 1.10.x releases require Java 8 at run time, but I am using Java 7 in my project.
Therefore, I need to use Ant 1.9.x releases instead of 1.10.x releases