Http 500 Internal Server Error

Question

http://localhost:8080/file.jsp?arg1=&arg2=11

runs successfully

http://localhost:8080/file.jsp?arg1=&arg2=

(empty value for argument 'arg2')

shows 500 Internal Server Error

The value of 'arg2' is used by an 'int' variable in 'jsp' using Integer.parseInt(request.getParameter("arg2")

How to fix it?

Which app server you are using. It is the server/application issue. Check if your application is handling null values, or else check with the server support. — Ramesh PVK, Apr 02 '12 at 08:36
"HTTP 500 internal server error" is an overly generic message that the server has a problem processing the request. This is in turn usually caused by a bug in the server side code. This information is visible in the server logs, usually in flavor of an exception and a stacktrace. You, as a developer, should pay attention to this exception. Just telling "I got a 500 error" is absolutely not helpful. — BalusC, Apr 02 '12 at 14:10

score 1 · Answer 1 · answered Apr 19 '17 at 15:17

It is always better to check the query parameters against what is needed. In this case you can use org.apache.commons.lang.math.NumberUtils library to check if the entered value is a number or not and use default value in case it is not a number.

int arg2 = NumberUtils.isNumber(request.getParameter("arg2")) ? Integer.parseInt(request.getParameter("arg2")) : 0;

Hardik Mishra · Accepted Answer · 2012-04-02T10:00:34.557

1

It is because you are trying to parse "" with Integer.parseInt

Check Integer parseInt() API

When you do not pass any values Like below

http://localhost:8080/file.jsp?arg1=&arg2=

Empty string will be passed in http request parameters.

So, better put empty check when parsing integer from string.

int arg2 = !"".equals(request.getParameter("arg2")) ? 
                Integer.parseInt(request.getParameter("arg2")): 0;

edited Apr 02 '12 at 10:00

answered Apr 02 '12 at 09:52

Hardik Mishra

14,779
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This doesn't cover string values containing non-digits. E.g. `arg2=foo`. – BalusC Apr 02 '12 at 14:11
@BalusC: I agree but there is a different validation required using regx or pattern matcher in java +5. – Hardik Mishra Apr 02 '12 at 14:36

score -1 · Answer 3 · answered Apr 02 '12 at 07:23

-1

If you are using Internet Explorer, go to Tools - Internet Options - Advanced - under Browsing untick "Show Friendly HTTP Error Messages". This will allow you to get a better description of what the error is.

To help you with your code itself, you will need to post it.

answered Apr 02 '12 at 07:23

M Lamb

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It is a sever issue. Browser has nothing to do with this. – Ramesh PVK Apr 02 '12 at 08:36

Http 500 Internal Server Error

3 Answers3