Solved Unknow NullPointerException

Discussion in 'Plugin Development' started by 0verFull, Jun 25, 2020.

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    0verFull

    Hi, I need your help with my plugin.

    I have
    Code:
    String[][] strs = new String[][]{new String[]{...},....};
    System.out.println(strs);  //print the object, not null
    for(int i = 0; i < strs.length; i++)
        System.out.println(strs[i]);  //print the object, not null
    
    Data data = DataUtils.read(strs)  //NullPointerException, strs is null, I don't understand why
    My mind is completely confused, I tried a lot of things and I can't see why strs is null.

    Can you help me?

    Thanks!
     
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    timtower Moderator Moderator

    @0verFull What are you trying to do? Why do you need a nested array of strings?
     
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    0verFull

    @timtower It's the needed parameter of the method DataUtils#read(String[][])

    I use this in another plugin and it works but here, I don't know why it's null in read() method while it's not null the line before (nothing change...)
     
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    timtower Moderator Moderator

    @0verFull You sure that it isn't in the DataUtils then?
     
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    0verFull

    @timtower
    I'm sure DataUtils is an own created class and read() method start with

    public static Data read(String[][] strs) {
    if(strs == null)
    // throw NPE

    ....
    }
     
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    timtower Moderator Moderator

    @0verFull strs won't just become null though.
    Where does DataUtils come from?
     
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    0verFull

    @timtower It comes from an own created API. So in the plugin I'm writing, it's considered like an external source.
     
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    timtower Moderator Moderator

    Then look at the source of the API, find the nullpointer.
     
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    0verFull

    @timtower the API is mine. Read() method is in the API
     
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    timtower Moderator Moderator

    Then post the code for your method in this plugin, code for that function, and the error.
     
  11. Offline

    Strahan

    .... then in this question:
    You should have answered as to what the API function needs that for. It sounds like an X/Y problem. Nested string arrays like that are sloppy, so it's likely you can better achieve whatever you are doing with a different approach.
     
  12. Offline

    0verFull

    Problems resolved, the line of code was in a for loop when it should not. Sorry to waste your time, careless error

    Sorry and thanks!
     
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