while successful login reporting a error
actual source code
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Please do not post code or errors as screenshots. https://meta.stackoverflow.com/questions/303812/discourage-screenshots-of-code-and-or-errors Edit your post and insert the actual code and error (it is however a good idea to supply an image to clarify something, but not alone without context). – hellow Sep 24 '18 at 06:20
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java.lang.String getParameter(java.lang.String name)
Returns the value of a request parameter as a String, or null if the parameter does not exist
As far as I can see, you don't pass a parameter to your page and therefore getParameter returns null and you try to access it without actually checking it.
hellow
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