Tiles Within JSP Question

I have a JSP that has this line...
<img src="<tiles:getAsString name='imgName'/>" />
I get "weird" results however, when I call this JSP. The controller class that I had called (that calls this JSP) gets called a second time for some odd reason. If I put in a hard-coded string inside src then I don't have this problem. It seems like a very bizaare thing to me but that's what's happening. Note that if I put the line <tiles:getAsString name="imgName"/> outside of the src attribute then I don't have this problem either.
Any help would be GREATLY appreciated.

Thanks, that thread was informative. I thought it might help to use a base tag to set the url for the page, but I'm still baffled as to how the getServletContext().getRequestDispatcher() works and why this:
<p>getServletContext().getRequestDispatcher("/welcome.jsp")
<p>(from within the servlet at /WEB-INF/classes/Login.class) displays the welcome.jsp page in the browser but you look into the location bar and you see the servlet path "/servlet/Login".
<p> thanks.

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Uh, what?
(And you are sure that it's not a Weblogic-specific question?)

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I have read/heard conflicting reports pertaining to calling EJBs from within JSP pages.
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Hi,
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Davidc:
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null

Which forum should I use if I have JSP questions?

Hi, pals!
Which forum should I use if I have JSP questions?
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http://forum.java.sun.com/forum.jsp?forum=45

WLS 7 JSP Questions

Hi all, a couple of questions.
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          Try to set working dir or similar in your weblogic.xml. You can use admin console
          to set/edit it and make the modified descriptors persistent.
          "Will Hartung" <[email protected]> wrote:
          >Hi all, a couple of questions.
          >
          >WLS 7.001 (think it 001, maybe 01, whatever, it has the first SP I'm
          >pretty
          >sure), on W2K (dev) and Solaris 8 (deploy).
          >
          >Currently our app is deployed in "exploded" form within WLS, for
          >developement, but will be deployed as a single EAR in production.
          >
          >Whenever we restart WLS, it seems to need to recompile the JSP as it
          >first
          >sees them, rather than taking advantage of the fact that they were compiled
          >"last time". Once compiled, the system seems pretty quick, but the JSP
          >compiles really crush any built up momentum.
          >
          >Is there a way around this? A way for it to not recompile "unchanged"
          >JSPs
          >after the sever is restarted?
          >
          >Second, what is the Best Practice on how to pre-compile the JSPs, so
          >this
          >can be eliminated completely. Does anyone have a good document on how
          >to
          >create a WAR filled with pre-compiled JSPs? Is there an ANT task that
          >only
          >pre-compiles the changed JSPs during a build?
          >
          >I know that there is a "compile JSPs on deploy" option, but that's just
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          >practical. Our site has almost 3000 JSPs, and the deploy would just be
          >eternal. Worse, the system must "re-deploy" the application whenever
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          >
          >Will Hartung
          >([email protected])
          >
          >
          >

Tile Based Game Questions

Hi, I know there are tons on posts about this topic, but I can not find the answer to my questions.
First, how would I go about moving the world around so the char is always in the center or near center of the screen? Do I have to have some sort of offset or something?
Second, how would I have efficient collision dection? I use the following code for movement...
public class worldTravelPanel extends JPanel implements MouseListener
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     mapRoof mapRoof = new mapRoof();
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     public void mouseClicked(MouseEvent e){}
     public void mousePressed(MouseEvent e){processMouseMotion(e);}
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}Thanks for any and all help!
Ryltar

I answered this here:
http://forum.java.sun.com/thread.jsp?forum=406&thread=535480&tstart=60&trange=15
If that doesn't work for you, ask some more specific questions and I'll try to give more help.

Html fragments within JSP code

Hi
I'm not a developer, but need to create some JSP pages to sit within the site page structure.
I was originally told i had to strip out the following tags....
<html> <head> and <body>
And just use the bare bones layout tags.
But i have created a small piece of functionality that relies on calling a javascript function from within the <body> tag....
Is it so bad to leave in this <body> tag in the page fragment?
I'm not even sure if this is the standard way to create JSP pages but if anyone can offer any advice that would be great.

There is no requirement to strip out the html or body tags, or any tags for that matter. In fact, JSP isn't specific to HTML content. JSPs can be used for XML, WML, or some proprietary client content markup.
JSP pages are simply dynamically generated pages to define it quite unofficially and non-technically.
Your topic seems to be one of web content development. This forum is dedicated to the Web Application Framework. I'm not sure what your challenges are, but you will likely find more successful guidance on a forum that is focused on web design or general JSP technology.
But to answer your question, you can keep your html based tags in the JSP.
craig

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I have a JSP with a number of beans declared as session beans.
I then include (JSP:INCLUDE) a servlet which then tries to access one of the session beans.
To check how things are going I do the following within the servlet:
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I always get the "A new session was created!" reply.
When I return to the JSP, any information that had been set up in the servlet does not appear in the session.
It appears that the JSP has created another session, different from the servlets session and all the beans are in their initial state.
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Regards
Phil

I have a JSP with a number of beans declared as
session beans.
I then include (JSP:INCLUDE) a servlet which then
tries to access one of the session beans.
To check how things are going I do the following
within the servlet:
// Retreives session Object
HttpSession session = req.getSession(true);
if (session == null) {
printTrace("Failed to get the
("Failed to get the Session!");
if (session.isNew()) {
printTrace("A new session was
("A new session was created!");
I always get the "A new session was created!" reply.
When I return to the JSP, any information that had
been set up in the servlet does not appear in the
session.
It appears that the JSP has created another session,
different from the servlets session and all the beans
are in their initial state.
QUESTION:
Could someone point me towards some information on
when the session is created in a JSP?
Regards
PhilTry HttpSession session = req.getSession(false);
When you pass true, it will create a new session if one does not exist. thats why you get "A new session was created!" all the time.
regards
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Accessing classes in web-inf/classes within JSP

hi,
i know this is probably a very basic question..or nobody would ever do something like this..but I'mn curious:
i have a class Car.class in the WEB-INF/classes directory and I want to access it from withing JSP : <% Car c = new Car(); %>
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thx

You could try packaging it in a jar, and placing the jar in WEB-INF/lib... I have no idea if that will help, but when you're debugging, you have to be willing to try anything.. :)

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Hi All,
I am writing a JSP page, and need to instantiate an object of a certain class within my package, in my JSP page.
How do I do that? Do i use the <%import = "Whatever.class" %>
Any help would be greatly appreciated.
Kal.

Hi.. Thanks for ur reply.
I am actually having a problem with the import statement. So the part where you have mypackage.Myclass, it is not working for me.
I am using Sun Forte.. and the directory is myprojects/test/Classes/MyClass.java
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Thanks
Kal.
Using directive for import statements:
<%@ page
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Then use scriptlet:
<%! MyClass c= new MyClass(); %>
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How can I run a snippet of code upon a user request using JSP? It seems that whether the code is within <% %> or <%= %>, it is always run once the page is displayed. In javascript I am able to run a section of code in this fashion:
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If you want to execute java code which is present in the same JSP upon some action of the user, then post the page to itself, for eg.
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you could use the following eg.JSP name :BTLogin.jsp
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%>
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<tr>
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</table>
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<center>
</center>
</body>
</Html>

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How would I accomplish using this variable within my JSP tag?

Your definition of the selectString attribute must indicate that it can accept runtime expressions.
<%
String cust_id = request.getParameter("cust_id");
String selectString = new String("r.ccar_id = c.id AND c.cust_id = " + cust_id);
%>
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i have just begun to learned jsp and java recently, so have the question below:
Situation:
My boss asked me to do a project for doing online data mining.
He requested the thing below:
1. Write a webpage by jsp with some textfield or pull down meun to get the parameter for getting the opinion and the parameter needed for the java class.
2. When the user click the buttom in the website, then the java class have to be invoked.
Questions:
1. ask i put the .java in the server, i can simply use cmd and type the following command:
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but i don't know how to write.
i think conceptualy will be like this :
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but the tomcat server reply a internal error to me
how cani do ?
the jsp file-->
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<html>
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I still don't see why the form (the origin of the request) has to be a JSP, As you say, it might be static but forms I've written have usually had some kind of menu framework arround them and other variables. Also if the input is invalid you usually want to re-present the form, with an error message and the fields pre-populated according to what the user put in before. That does require a JSP and you may as well use the same JSP for an empty, as for a rejected request.
the response to the form should be handled by a servlet. Both is HTML, but the
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Suppose the boss wants to turn a graphics designer loose on your HTML. Don't want him mucking about with your processing code do you.
The servlet typically takes the function of controller in the model/view/controller paradigm.
Code in a servlet is cleaner, better formatted and easier to access with a debugger.

Using Collections within JSP and beans

Hi I have a bean setup that contains a collection (linkedList of objects)
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ResourceInformation resourceInfo = new ResourceInformation();
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as I havent been able to find any examples of JSP pages utilising collections
Thanks a lot

The JSTL (http://java.sun.com/products/jsp/jstl/) contains a <c:forEach> tag you can use to iterate collections - e.g:
<c:forEach var="resource" items="${requestScope.resourceInformation.resourceList}">
<tr>
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</tr>
</c:forEach>

Tiles Within JSP Question

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