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up vote 5 down vote favorite 
public String[][] fetchData()
{
    String[][] data = null;
    int counter = 0;
    while (counter < 10){
        data[counter] = new String[] {"abc"};
        counter++;
    }
    return data;
}

Getting the error in this loop. Please let me know where i am wrong

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up vote 5 down vote accepted

You need to allocate memory to data. 

String[][] data = new String[ROW][COLUMN].

Read this

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Sweet handle! Where'd you get the pic? Is that the cover for the last book? – Code-Apprentice Oct 2 '12 at 16:06
    
@Code-Guru Thanks :) bit.ly/PL9CrY Google images xD – Lews Therin Oct 2 '12 at 16:08
    
@Code-Guru Nope. This is the cover: tor.com/blogs/2012/05/… – Lews Therin Oct 2 '12 at 16:10
1  
Sweet! I love it! Can't wait! – Code-Apprentice Oct 2 '12 at 16:23
    
@Code-Guru I as well. I hope you read the first chapter. If not here is the link. Some spoilers at the end! tor.com/stories/2012/09/… – Lews Therin Oct 2 '12 at 16:29
up vote 2 down vote 
String[][] data = null;

==> you have a null pointer exception when you try to write in data

You might do

String[][] data = new String[10][];
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thank you...that workd – user1714837 Oct 2 '12 at 16:05
up vote 1 down vote

You get a NPE because you explicitly set data to null:

String[][] data = null;

You need to allocate the number of rows first:

String[][] data = new String[][NUMBER_OF_ROWS];
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up vote 1 down vote 
data[counter] = new String[] {"abc"};

Here you are putting "abc" to array, but why you're using array if it has only one cell?

data[counter] = new String("sample string");

would be enough. And ofc you need also to declare "data" as one-dimensional array.

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