Material NPE

Hey! I am trying to set a sign ling to a materials name, and I am getting the name from an input ID.

It is throwing NPE here:

Code:java

e.setLine(1, mer.toString());

Code:java

Material mer = null;
try {
                          int id = Integer.parseInt(e.getLine(1));
                          mer = Material.getMaterial(id);
                      } catch (NumberFormatException err) {
                          mer = Material.matchMaterial(e.getLine(1));
                      }

 

HeavyMine13
add some checks in your second snippet and put a return; if its still null after the try and catch, because I suspect you are using the mer Material outside the try and catch futher?

 

after try and catch, I have other methods and my first snippet

 

HeavyMine13

• matchMaterial(String) does the id check already
• matchMaterial(String) will return null if the material doesn't exist

 

I just made this and still shoots the error bellow:

Code:java

if (Material.matchMaterial(e.getLine(1)) != null|| Material.matchMaterial(e.getLine(1)) != Material.AIR) {
Material mer = Material.matchMaterial(e.getLine(1));
e.setLine(1, "Lal");
}

Error:

 

HeavyMine13 what you basically did was the following: if text is not a material OR if not air. So if it's null, it's not air, which means that the condition is true (and the if statement will execute). Change || to &&.