req.getParamValue[0] ?
The shortest way is probably this :
if("yes".equals(b)) {
.
.
}
Pierre-Yves
-----Message d'origine-----
De : A mailing list for discussion about Sun Microsystem's Java Servlet API
Technology. [mailto:[EMAIL PROTECTED]]De la part de Michael
Brubaker
Envoy� : mardi 25 septembre 2001 06:28
� : [EMAIL PROTECTED]
Objet : Re: Null pointer exception
I would consider trying this:
if ((req.getParamValue[0].length() != 0) && (b.equals("yes") == true)))
It would seem that b is generating a NullPointerException for params not
checked. Checking first to see that the param has a value (by checking the
length of the first--and probably only--value) might do the trick. Using
the shortcircuited && will allow the code to fall through if null, and not
generate the NPException.
Hope this helps.
----- Original Message -----
From: Brad Whiting
To: [EMAIL PROTECTED]
Sent: Monday, September 24, 2001 11:39 PM
Subject: Null pointer exception
Hello all,
I am a rookie java servlet programmer, and I am getting an error that is
confusing me.
I have created an HTML form that has a large number of check boxes. The
idea being that each checkbox represents a column in a database. I hope to
structure an sql call that will include only the checked columns. The odd
thing about the program is that it works fine if I check every box. If I
leave any unchecked I get a null pointer exception at the point in the code
where I am checking to see if the box is checked.
This is an example of my html input statement:
<input type=checkbox name=cpumod value="yes"> CPU Model
This is an example of my servlet code that checks:
String b = req.getParameter("cpumod");
if (b.equals("yes") == true)
sqlcom2 += ",\n CPUMOD";
This is the exception I see in my logs:
Instantiate: DBgetsysid
Sep 24, 2001 17:57:08.357 PM 12d7140000000019:Thread-13:130899e0
StrictServlet X doService
java.lang.NullPointerException
.at DBgetsysid.doPost(DBgetsysid.java:68)
BTW I am using doPost to process the form. Can anyone help me with my
mistake? I just can't see it.
TIA,
brad
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