NullPointerException, when reading HTML input [duplicate]

Answer 1

Use the name attribute instead of the id attribute

<input type="Text" name="percentage">

and

<textarea name='wordList' value='wordList'>

Read: Introduction to forms

Answer 2

To be able to access it as a parameter, 'wordList' should be specified as the 'name' - not as the value:

<textarea id='wordList' name='wordList'></textarea>  

Also, make sure you validate the field to check if it is null, before you use it in the rest of the code.

Answer 3

I think you need to specify the name attr: