Is there a method like (!isDefined) in JSP

Hello! I am a core java developer and am very new to JSP. I have 2 files A.jsp and B.jsp. A.jsp is including B.jsp. There
is a variable defined in A.jsp which is being used in B.jsp. Now B.jsp
should check that if the variable is not defined than it should define
and put a default value in the variable in B.jsp. So in JSP do we have
something like !isdefined(var). or is there any other way I can solve
this problem.
Thanks in Advance
Anubha

Similar Messages

Is there any method like refresh,reload etc

Sir/Madam,
when i m trying to add new controls dynamically, in a Frame ,they are not appeariing until we made a click on the window.Is there any method to reload,or refersh or update to make changes without made a click on window.

validate(); OR repaint(); OR pack(); //this method resizes the frame though...... after you add components to the frame you should call validate();
David

Is there any methods like application activated and application de-actived in windows app 8.1

Hi,
Is there any events such as on application loaded and application closed in windows store app 8.1
Thanks,
Alok

Please see the application lifecycle page:
https://msdn.microsoft.com/en-us/library/windows/apps/hh464925.aspx
Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.
NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined
objects and unknown namespaces.

Need of a self explanatory method like toString(): Your Opinion?

Hi All,
If including a method like showHelp() is recommended as
java programming standard like incorporating toString() in
a class, it will serve as an online help mechanism for
developers using the class. It will be helpful reference
when the source code or API documentation is not available.
Also it will be a nice mechanism for the coder to give
usage information of his class to a newbie or intermediate java programmer.
Example:
public class MyClass {
public int width;
public MyClass() {
public String toString() {
return "Class:MyClass, width:"+width;
public String showHelp(){
String help;
help = "This class is intended to use for.. \n\n";
help += "Typical Usage is... \n\n";
help += "Sample code as followed...\n\n Thank you.";
return help;
}This is what Sun's reply when I submit the feature.
"If you feel this should be implemented and the need is justified,
please start a topic in the JDC forum to see if there is support, and
email me the link. Thanks."
Please share your views regarding this feature.
Thanks.
-bathra

My question is how would this build over Javadoc standards? With the showHelp() method available, wouldn't this be useful only for the programmer? What about running Javadoc on the class and reading the html produced by it? That's what it's there for.
http://java.sun.com/j2se/1.4/docs/api/index.html
If a closed source class file does not have well written thorough documentation, what good will the showHelp() provide? If the documentation isn't available, the question would be why should the class file even be used if you won't have the documentation to be able to use it properly. If the class file is a purchased 3rd party component, that group is responsible for providing good documentation.
This would dramatically increase the size of the compiled Java Bytecode as most comments I've seen are more than tripple than the source of a .java file. Including the comments as an output method could be overkill. My personal opinion is to follow the Javadoc standard and include the html output. Well written tight code is mainly what I'm after.

In Jsp TagLib how can I get the Attribute value (like JavaBean) in jsp

Dear Friends,
TagLib how can I get the Attribute value (like JavaBean) in jsp .
I do this thing.
public void setPageContext(PageContext p) {
          pc = p;
pc.setAttribute("id", new String("1") );
          pc.setAttribute("first_name",new String("Siddharth")); //,pc.SESSION_SCOPE);
          pc.setAttribute("last_name", new String("singh"));
but in Jsp
<td>
<%=pageContext.getAttribute("first_name"); %>
cause null is returing.
Pls HELP me
with regards
Siddharth Singh

First, there is no need to pass in the page context to the tag. It already is present. How you get to it depends on what type of tag:
Using [url http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/jsp/tagext/SimpleTagSupport.html]SimpleTagSupport
public class MyTag extends SimpleTagSupport
public void doTag()
    PageContext pc = (PageContext)getJspContext();
    pc.setAttribute("first_name", "Siddharth");
    pc.setAttribute("last_name", "Singh");
    pc.setAttribute("id", "1");
}Using [url http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/jsp/tagext/TagSupport.html]TagSupport or it's subclass [url http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/jsp/tagext/BodyTagSupport.html]BodyTagSupport the page context is aleady declared as an implicit object:
public class MyTag extends TagSupport
public void doStartTag()
    pageContext.setAttribute("first_name", "Siddharth");
    pageContext.setAttribute("last_name", "Singh");
    pageContext.setAttribute("id", "1");
}In each case, this sort of thing should work:
<mytags:MyTag />
<%= pageContext.getAttribute("first_name") %>I

AOD Like Something in JSP

Hai pl tell me there is a consept of AOD in .NET
is there any consept like AOD in java or in jsp
there is DATA SET in .NET is there any DATA SET Consept in java OR in jsp

http://java.sun.com/docs/books/tutorial/jdbc/

Is there a method in labviewto dynamically save and change the monitor resolution under program control?

Is there a method in labview to dynamically save and change the monitor resolution under program control? I have another application that runs on another monitor. I would like to change the monitor resoultion to 640x480 on program startup, and then restore the monitor resolution back to the user's settings on exit. Can this be done?

vaidehi_joshi wrote:
Is there a method in labview to dynamically save and change the monitor resolution under program control? I have another application that runs on another monitor. I would like to change the monitor resoultion to 640x480 on program startup, and then restore the monitor resolution back to the user's settings on exit. Can this be done?
Have you already done this manually? I've seen Labview scale front panels very strangely when changing resolutions...
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

Can we override jspinit,jspdestroy,jspservice methods in our own jsps?

iam new to java.
iam now learning these topics.
can we override jspinit,jspdestroy,jspservice methods in our own jsps?
plz send me with explanation.

well, the JSP will become the content of the jspservice method.
So yes, you can override that one (in fact there's no way you will NOT override it when creating a JSP :) ).
But indeed, you should not even have the beginnings of any thought about "methods" or "overriding" anything when writing JSPs.
You should not in fact use a single line of Java code when writing them.

Is there any method of telling the software to look at a network location for the mozilla.cfg

I run in a locked down environment, and I would like to know if there is a way to have a central mozilla.cfg file stored on a network location. This is for ease of management. I know you can obviously push out a mozilla.cfg to the normal location via log in script but I have a need to have the file redirected to a network location. TIA.

hey there.
both methodes dont work :/
i want to store the mozilla.cfg file on a network server..
lockPref("autoadmin.global_config_url", "file:///F:/firefox/mozilla.cfg");
and
lockPref("autoadmin.global_config_url", "http://example.com/mozilla.cfg");
didnt work.. i dont lockdown the proxy settings on the clients..
please help me i search since 1 week :/
greetz Marsich

Writing a method like oncommit,onadvancedsearch,onrollback.....

Hi friends,I want to write a method like oncommit.For example onuser...what can I do? where can I write or add my codes I call it in jsp page with javascript:doEvent('user','true').And I use onuser method in JhsDataAction.I create JhsDataAction for my jsp page.When I press button I want it calls executing onuser ????? Thanks for help

Create a subclass of JhsDataAction, and add your onUser method with the following signature:
public void onUser(DataActionContext daContext)
To use the subclass, either set the service-level property Data Action class to your subclass, or change the class name in the generated struts-config for the specific action.
Steven Davelaar,
JHeadstart Team.

Is there an application like "snag it" for mac? Does it come with the Mountain Lion OS, or do I have to buy it separately?

Is there an application like "snag it", which is part of the Microsoft Office suite for mac? Does it come with the Mountain Lion OS, or do I have to buy it separately? If it is a separate purchse, what would you recommend?

Built-in to OS X is the ability to capture an entire screen or selected portions. Snaps are saved to the Desktop by default:
COMMAND-SPACE-3 snaps the entire screen.
COMMAND-SPACE-4 lets you select a portion of the screen to snap.
In your Utilities folder is a utility called Grab that provides similar functionality and more.
Then there are dozens of third-party solutions such as SnapNDrag and SnapzProX. You will find them and others at MacUpdate or CNET Downloads. Most have trial versions or trial times so you can test them out.

There are sites like Amazon, Facebook and pages where I need to put info on that don't totally show all the points. How can I get them to show up? I usually have to guess

There are sites like Amazon, Facebook and pages where I need to put info like name, address, etc, that don't show where 'next' or 'skip' or 'continue' are. There is just alot of space. When I move my cursor around I have to guess if it's the right one and click

For some ways around this see [http://kb.mozillazine.org/User_name_and_password_not_remembered User name and password not remembered - MozillaZine Knowledge Base]
Another option is the [https://addons.mozilla.org/en-US/firefox/addon/60265/ Saved Password Editor] add-oin which allows you to add passwords for sites that disable password saving.

Is there a method I can use to test the space cost of a Java program?

I am trying to test the space cost of a Java program (or a few lines of executed codes), however...
Firstly I tried to use the method freeMemory() in runtime class at start and end of a number of lines tested on, and then find the differences between them. But because I don't know when JVM releases memories, this idea seems not working.
I also tries to use the -verbose:gc to print the GC actions, which is also hard to be automatically collected (Computing the results one by one by hand is too burdensome).
Is there a method in some classes can be used for doing this? Could anyone help me on this, please?

Up _+ ...

IPhone calendar appointments set to local calendar, and need to switch to exchange calendar. Have to edit each appointment one at a time and change to exchange calendar. Is there any method to edit all appoints in my calendar at once?

iPhone calendar appointments set to local calendar, and need
to switch to exchange calendar. Have to edit each appointment one at a time and
change to exchange calendar. Is there any method to edit all appoints in my
calendar at once and change the calendar setting?

Not sure this will work but if you go into the Keyboard preferences, then click the Keyboad Shortcuts tab, and then the '+', you can add your own shortcuts for any application. I am not sure what happens if you try to override an existing shortcut since I haven't tried using this.
Edit/Update:
Probably against my better judgement I'll also throw this out there - there's an Unsanity haxie called Menumaster which might also allow you to do what you want. Against my better judgement because personally I stay clear of haxies. It's (all haxies) probably almost certain to break in Lion. They always do with each major release.

Use of bpelx built-in methods like getVariableData in custom java classes

Hi,
how can I use bpelx built-in methods like getVariableData ...
inside custom java classes embedded with BPEL project?
I have large java code to embed with BPEL process
and it will be very useful ....
It is possible to access these methods like static methods of some class?
import com.xxx.yyy.class;
class.getVaribleData("inputVariable","payload","/ns1:mailMessage/ns1:content/ns1:multiPart");
Regards
Karel

you can access them from <bpelx:exec> activity and you can pass these returned document to underlying java class.
Re: getVariableData in Java Exec

Is there a method like (!isDefined) in JSP

Similar Messages

Maybe you are looking for