Error JDWP Unable to get JNI 1 2 environment jvm- GetEnv return code -2

Question

I wrote a simple code for finding whether a number is even or odd. Here is the code :

import java.util.*;
public class EvenOdd {
    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter a number");
        int num = in.nextInt();
        if (num % 2 == 0)
            System.out.println(num+" is even");
        System.out.println(num+" is odd");
    }
}

Output:- I am getting the output but there is an error aswell

Enter a number
2
2 is even
ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return code = -2
JDWP exit error AGENT_ERROR_NO_JNI_ENV(183):  [util.c:840]

Answer 1

Hello @Jino,

It is just a JVM bug its harmless and wont effect your code. You can use System.exit(0) at the end to avoid it.

The code you have written is not correct. You forgot to use else. Java doesn't follow indentation like python does. When you will input an even number it will print it as both odd and even.

import java.util.*;
public class EvenOdd {
    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter a number");
        int num = in.nextInt();
        if (num % 2 == 0)
            System.out.println(num+" is even");
        else
            System.out.println(num+" is odd");
    }
}