ADDITIONAL SYSTEM INFORMATION :
Picked up _JAVA_OPTIONS: -Dawt.useSystemAAFontSettings=gasp
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)

A DESCRIPTION OF THE PROBLEM :
Accordingly to Javadoc (https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html#getResource-java.lang.String-) Class.getResource method returns "A URL object or null if no resource with this name is found". However, a different result is returned when executing the following program.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile the program
2. Run it using Oracle HotSpot java

ACTUAL -
file:.../target/classes/

---------- BEGIN SOURCE ----------
public enum A {
    X, Y
}

public class B {
    public static void main(String[] args) {
        System.out.println(A[].class.getResource(""));
    }
}
---------- END SOURCE ----------

FREQUENCY : always