Solved

JSP Empty String Problem

Posted on 2002-04-08
3
222 Views
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.
0
Comment
Question by:barnarp
  • 2
3 Comments
 
LVL 92

Accepted Solution

by:
objects earned 75 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

0
 

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
0
 
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
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Java Jpanels and Jframe 8 28
JUnit 4 @Before and @BeforeClass differences 3 48
simple java question 3 44
Java DateChooser? 3 29
This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.

929 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now