Thread: There is some kind of Exception - Do not know the problem

package java;
import java.util.Scanner;
public class Project_1 {
	public static void main(String args){
		 Scanner fire = new Scanner(System.in);
		 double firstnum, secondnum, answer;
		 System.out.println("Enter your first number: ");
		 firstnum = fire.nextDouble();
		 System.out.println("Enter your second number: ");
		 secondnum = fire.nextDouble();
		 answer = firstnum + secondnum;
		 System.out.println(answer);
	}
 
 
 
}

These are the errors:
Exception in thread "main" java.lang.SecurityException: Prohibited package name: java
at java.lang.ClassLoader.preDefineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknow n Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unkno wn Source)


I don't know!

So I can't use the package name java?

A rhetorical question, I hope.