Java IllegalArgumentException is a runtime exception that is thrown when a method receives an argument that is inappropriate or invalid for the expected parameters. It is commonly used for input validation to indicate that an argument does not meet the method's requirements. Introduced in Java 1995 with Java 1.0, IllegalArgumentException is part of Java's java.lang package and is often used to prevent incorrect or inconsistent data from being processed.

https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html