Gradle script for refering jdk jars from java_home of pipeline

[Kashif-Ur-Rehman]

How can i use java_home from pipeline gradle script.
Actually I need rt.jar for compiling my one project, I cannot commit rt.jar because its size is very big, so I was just finding any other possible way of how I can compile my project without commiting rt.jar.
Is there any way that i can refer rt.jar from java_home of pipeline ?