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JSP Empty String Problem

Posted on 2002-04-08
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Last Modified: 2006-11-17
hi,

I have two edits on my first jsp page, which values I send via form submit to the second page.

I want to test on my second page whether these values is empty, and if they are, forward to another page.

The problem is that when the values are empty, the jsp engine regards them as "not empty"?? and doesnt go into the fowarding
if statement.

I have even tested the values by displaying them in the second page, but no luck.

If I go and set these values to "" before i execute the if, it works!

I must be missing something obvious.

--page 1--

<input type="text" name="edtItemNumber">
 <input type="text" name="edtStoreLocation">


--page 2--

String item = request.getParameter("edtItemNumber");
String location = request.getParameter("edtStoreLocation");

if ((item == "") || (location == ""))
{application.getRequestDispatcher("/oraerror.jsp?ErrorStr=Please complete Item number and Store Location." ).forward(request,response);}


Please help.
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Question by:barnarp
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3 Comments
 
LVL 92

Accepted Solution

by:
objects earned 300 total points
ID: 6927302
You shouldn't use == to test String equality. It tests for object equality, not whether the two objects represent the same string. To test if a string is empty use one of the following:

item.equals("")

or

item.length()==0

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Author Comment

by:barnarp
ID: 6927313
Thanks alot.

Do you know of any reference on the net, where I can learn more about string functions etc ?

Pierre
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LVL 92

Expert Comment

by:objects
ID: 6927338
Pierre,

Try:
http://java.sun.com/docs/books/tutorial/java/data/strings.html

And of course the good old javadoc :-)

http://www.objects.com.au
Brainbench MVP for Java 1
http://www.brainbench.com
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