Factory Method for immutable Map java 9

ImmutableMap.java

package com.java9r;

import java.util.*;

public class ImmutableMap {

 public static void main(String[] args) {

  try {
   System.out.println("Products List");
   Map<Integer, Object> products= Map.of(1, "Product 1", 2, "Product 2", 3,"Product 3", 4,"Product 4", 5, "Product 5", 5, "Product 5");
   products.forEach((key, value) -> {
    System.out.println("Key -: "+ key + " "+" Value - : " + value);
   });
  } catch (Exception e) {
   e.printStackTrace();
  }
  


 }
}

Exception

 Products List
java.lang.IllegalArgumentException: duplicate key: 5
 at java.base/java.util.ImmutableCollections$MapN.<init>(Unknown Source)
 at java.base/java.util.Map.of(Unknown Source)
 at com.java9r.ImmutableMap.main(ImmutableMap.java:11)

ImmutableMap .java

package com.java9r;

import java.util.*;

public class ImmutableMap {

 public static void main(String[] args) {

  try {
   System.out.println("Products List");
   Map<Integer, Object> products= Map.of(1, "Product 1", 2, "Product 2", 3, "Product 3", 4, "Product 4", 5,
     "Product 5");
   products.forEach((key, value) -> {
    System.out.println("Key -: " + key + " " + " Value - : " + value);
   });
  } catch (Exception e) {
   e.printStackTrace();
  }

 }
}

Output

 
Products List
Key -: 1  Value - : Product 1
Key -: 2  Value - : Product 2
Key -: 3  Value - : Product 3
Key -: 4  Value - : Product 4
Key -: 5  Value - : Product 5