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use Spring StringUtils.delimitedStringtoArray. Maybe I don't remember function name but I am sure Spring StringUtils class has function that you needed. :)
Your loop [For i = 0 To btns.Length Step 1] is wrong. The array starts from base index 0 to (array.length - 1). So, while you loop to [i = btns.Length], then [btns(i)] will be NULL. It'll occur this error. So, you just modified your loop from 0 to [btns.Length …
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