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In general, I want to create a launcher for my project in minecraft. I want to launch my project, and after that the launcher should open, but it will not open. The reason for this is written down below (highlighted in red). Translated this matter on the Internet, but did not really understand what the problem was. Maybe someone knows and understands this? Help me please

Closed due to the fact that off-topic participants 0xdb , default locale , Nick Volynkin ♦ Jul 26 '18 at 10:16 .

It seems that this question does not correspond to the subject of the site. Those who voted to close it indicated the following reason:

  • “Questions asking for help with debugging (“ why does this code not work? ”) Should include the desired behavior, a specific problem or error, and a minimum code for playing it right in the question . Questions without an explicit description of the problem are useless for other visitors. See How to create minimal, self-sufficient and reproducible example . " - 0xdb, default locale, Nick Volynkin
If the question can be reformulated according to the rules set out in the certificate , edit it .

  • You also wrote - an error on the 31st line of the file MainClass.java - Anton Shchyrov
  • and what does it mean? - Daniel
  • one
    This means that you need to open the MainClass.java file MainClass.java go to line 31 and see the error because of that - Anton Shchyrov
  • the screen added what is wrong there, damn it ... - Daniel
  • You'd better add the code - Anton Shchyrov

1 answer 1

When you load, you get a NullPointerException error and it occurs on the 31st line of the MainClass.jave file. This means that on this line there is a manipulation of an object that is null .

On this line you have written

 stream.close();

99% that stream is null . Accordingly, an attempt to call a method on null leads to an exception.

The stream variable is initialized on line 19

 InputStream stream = Starter.class.getResourceAsStream("/net/launcher/theme/favivon.png");

The documentation for the getResourceAsStream() method says

Returns:
A InputStream object or null if not found

Or in translation

Returns:
An InputStream object or null if a resource with this name is not found.

Here is the answer.

  1. The program did not find the resource /net/launcher/theme/favivon.png
  2. You did not immediately check the result
  3. You received a NullPointerException when you tried to access the object
  • Hmm, thank you :) And how to solve this problem? The fact is that I rummaged through the folders and found this resource favicon.png (the resource that the program could not find) - Daniel
  • I solved the problem, thank you very much for your help, patience and understanding :)))) - Daniel
  • @ Daniel Then mark my answer as correct - Anton Shchyrov