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Editorial Team
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Asked: 2026-05-29T15:23:34+00:00

I am attempting to upload a file from my html page to my servlet

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I am attempting to upload a file from my html page to my servlet side code and store it in an arraylist

heres my html:

<pre>
<!DOCTYPE HTML>
<html>
<head>
<title>file upload</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<form action="url to my servlet java code" method="post"  ENCTYPE="multipart/form-data">
<input type="file" value="browse..."/>
<br/>
<input type="submit" value="Upload File" />
</form>
</body>
</html>
</pre>

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heres what i have in my servlet page’s doGet() method

Part p1 = request.getPart("textfile.txt");
Scanner in = new Scanner(p1.getInputStream());
ArrayList<String> newList = new ArrayList<String>();
while(in.hasNextLine()){
     newList.add(in.nextLine());
}
Collections.shuffle(newList);

so once i select the text file i want and hit upload, i get a nullpointerexception error.

help?

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1 Answer

  1. Editorial Team

    Because when the user arrives on the page, it’s a GET operation, and so there’s no requirement at all that any data has been provided to the page. But you’re assuming in your code that getPart is not returning null. And yet, getPart is clearly defined as returning null if “… this request is of type multipart/form-data, but does not contain the requested Part.” (ref).

    Your form is defined as using POST, so you want to handle it in your doPost function, not your doGet function.

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