NullPointerException

What is this and how do I make it go away?

Stop using Java.

>>2
9/10

You get this exception when accessing a variable which does not contain a reference to an object, but the null-pointer.


You should get a file and a line-number with your exception. Find the line for which the NullPointerException has been called and check which variable is causing this problem.

Now think HARD why this variable hasn't been initialized.

>>2
Correct.

THREAD OVER

>>4
DON'T HELP HIM!!!

>>4
How can a reference and a pointer be stored in the same type?

>>6

Re-read what #4 said again, or stop trolling. Either way.

>>6

"reference" and "pointer" are synonyms in Java. It doesn't have two incompatible solutions for the same problem like C++.

To solve the problem - surround the lines causing the problem with a try/catch block.

　　　　　　　　　　　　　 　　 ＿∧＿∧＿∧＿∧＿∧＿∧＿∧＿∧＿∧＿
　　　　　ﾃﾞｹﾃﾞｹ　　　　　　|　NULLPO!!ﾇﾙﾎﾟ!!NULLPO!!ﾇﾙﾎﾟ!!NULLPO!!　|
　　　　　　　　ﾄﾞｺﾄﾞｺ　　 ＜　ぬるぽ！ぬるぽ！ぬるぽ！ぬるぽぬるぽ！ ＞
　　　☆　　　　　　ﾄﾞﾑﾄﾞﾑ　|　ぬぬぬるぽ！ぬるぽ！ぬるっぷぉ～！！　 .|
　　　　　　　　☆. ﾀﾞﾀﾞﾀﾞﾀﾞ! ￣∨￣∨￣∨￣∨￣∨￣∨￣∨￣∨￣∨￣
　　ﾄﾞｼｬｰﾝ!　　ヽ　　　　　　　　　ｵﾗｵﾗｯ!!　　　 ♪
　　　　　　　　　＝≡＝　∧＿∧　　　　　☆
　　　　　　♪ 　　／　〃（･∀･ #）　　　　/　ｼｬﾝｼｬﾝ
　　　　♪　　　〆 　┌＼と＼と.ヾ ∈≡∋ゞ
　　　　　　　　　|| 　γ ⌒ヽヽコ ノ　　||
　　　　　　　　　||　ΣΣ 　.|:::|∪〓　 ||　　　♪
　　　　　　　 .／|＼人 ＿.ノノ _||_.　／|＼

On Error Goto Gah

#include <ooc/lang/NullPointerException.h>

int main(void) {
  throw(new(NullPointerException(),
            "Why you made bro?"));
}

if(MyPointer==NULL){ printf("Barf\n"); return;}

Exceptions are overly weak and complicated and were conceived in a time when computation was not yet mainstream or accessible.

Error handling like C style error handling is a much better attempt at trying to solve the problems error handlers first set out to solve.