Question about somepage.jsp?id=10

I have a few questions about passing variables inside the actual URL.
Say for example i have a products list, each product has an id. When i click on the product various information will be displayed including price, name etc etc. At the same time comments from various customers will be displayed.
I was just wondering how i'll generate the number embedded inside the jsp which takes the user to the product information page. For example <a href="getProduct.do?id=10> how is 10" generated? Is it generated based on the productID?
If i have 10 and in the products table i have the values do i just extract them according to the id and list the various values? At the same time i'll just locate the product id (which is a foreign key) in the comments table and list the comments also. I'm using struts if that makes any difference.
Do i have the right idea?

In other words, if i've printed out all the customer names from the database to my jsp how do i make it a hyperlink to point to the customer id using show.jsp?cust=1

Similar Messages

Quick question about url/jsp mapping

Could anyone clarify whether the following mapping in the web.xml file is possible?
I want to access the file webapps\examples\gate\login.jsp by going to the page http://192.168.2.143:8080/work/login.jsp instead of http://192.168.2.143:8080/examples/gate/login.jsp
Currently I can map it fine to http://192.168.2.143:8080/examples/work/login.jsp,
which is an existing folder, but when I try and get it above the examples folder, it gives me the 404 error.
    <servlet>
        <servlet-name>Login</servlet-name>
        <jsp-file>/gate/login.jsp</jsp-file>
    </servlet>
    <servlet-mapping>
        <servlet-name>Login</servlet-name>
        <url-pattern>/../work/login.jsp</url-pattern>
    </servlet-mapping>

Using only work/login.jsp will cause an error, and the tomcat server to crash, if I use the pattern
<url-pattern>/work/login.jsp</url-pattern>, I just map the URL http://192.168.2.143:8080/examples/work/login.jsp instead of
http://192.168.2.143:8080/examples/gate/login.jsp
My entire webaps structure is rather long, and contains code other than my own, so I'd rather not post it, I just need to figure out if it is possible to map the jsp page to a path above the file. (do you think I need to do it in another web.xml?)

Question about the jsp:useBean tag

Hi, I'm a relative newcomer to jsp, but the following piece of javascript code has me very confused:
<%@ page import="com.jinsoft.bank.web.*" %>
<jsp:useBean id="account" class="AccountBean" />
This will result in java.lang.ClassNotFoundException, and it complains that AccountBean cannot be found.
However, when I fully qualify the class, it works:
<%@ page import="com.jinsoft.bank.web.*" %>
<jsp:useBean id="account" class="com.jinsoft.bank.web.AccountBean" />
Am I doing something wrong?
Isn't the import tag supposed to help?
Thanks for any help!

Hi Kim
I'm really interested in the particular error that you are generating. I tried this out using Tomcat 3.2.3 and it doesn't seem to be a problem. What application Server are you using?
Another way to find out if the problem is with the Application Server is to check the .java file that is created out of the jsp page before it is compiled. Individual Application servers have different ways of storing this intermediate .java file but most of them keep it if the compilation does not succeed.
You may possibly have to file a bug if everything else checks out fine. Another point, are you able to import the same bean into a Servlet and use it there?
Keep us posted.
Good Luck!
Eshwar Rao
Developer Technical Support
Sun microsystems inc
http://www.sun.com/developers/support

Questions About JSP?

hi;
I am php devloper and I am learning Java now.
I am using NB6.1 , Tomcat 6.0 , J2ee 5.
I have some questions about devleoping web application with jsp.
1.What are
/WEB-INF/web.xml
/META-INF/context.xml
/META-INF/MANIFEST.MF
files that generated with NB.are important or optional.are auto generated or may I edit.
2.can I distribute my web application in non text format.How?
3.if I want to add some files to my application that its running in tomcat.how can i do that with out rebuild all.
thank you
Add to mtz1406's Reputation

thank you all for helping.
I will write more information about my questions may this help others:
*{ /WEB-INF/web.xml* - The +Web Application Deployment
Descriptor+ for your application. This is an XML file describing
the servlets and other components that make up your application,
along with any initialization parameters and container-managed
security constraints that you want the server to enforce for you.
This file is discussed in more detail in the following subsection.
As mentioned above, the <code>/WEB-INF/web.xml</code> file contains the
Web Application Deployment Descriptor for your application. As the filename
extension implies, this file is an XML document, and defines everything about
your application that a server needs to know (except the context path,
which is assigned by the system administrator when the application is
deployed).
The complete syntax and semantics for the deployment descriptor is defined
in Chapter 13 of the Servlet API Specification, version 2.3. Over time, it
is expected that development tools will be provided that create and edit the
deployment descriptor for you. In the meantime, to provide a starting point,
a [basic web.xml file|http://localhost:8080/docs/appdev/web.xml.txt]
is provided. This file includes comments that describe the purpose of each
included element.
NOTE - The Servlet Specification includes a Document
Type Descriptor (DTD) for the web application deployment descriptor, and
Tomcat 6 enforces the rules defined here when processing your application's
<code>/WEB-INF/web.xml</code> file. In particular, you must
enter your descriptor elements (such as <code><filter></code>,
<code><servlet></code>, and <code><servlet-mapping></code> in
the order defined by the DTD (see Section 13.3).
h4. } from tomcat documentation
Tomcat Context Descriptor
bq. A /META-INF/context.xml file can be used to define Tomcat specific \\ configuration options, such as loggers, data sources, session manager \\ configuration and more. This XML file must contain one Context element, which \\ will be considered as if it was the child of the Host element corresponding \\ to the Host to which the The Tomcat configuration documentation contains \\ information on the Context element.
}from tomcat documentation
but I still want more information about this question:
Q3: I want to distribute (sell to another organaization) without give sorce code in jsp files.So I want to precompile it to be just class files or jar files.
I want to use ant that become with netbeans 6.1.can anyone give me information about how to do that.
thank you again

Newbie question about loading servlets on tomcat

I have what is probably a very basic question about loading simple servlets on to tomcat to test its installation. I have followed instructions from numerous tutorials to the letter but still I can't get it to work.
I have installed tomcat on win2k in c:\tomcat. I set up the jdk, environment vars (JAVA_HOME, CATALINA_HOME, TOMCAT_HOME) which all point at the correct dirs. I can compile a servlet without errors. I can also place a test jsp and html file into the root directory and they both work fine.
However, now I am trying a test servlet and no matter what I do it gives me a 404. I have a servlet class file called "HelloServlet.class" which I placed into the %install_dir%\webapps\ROOT\WEB-INF\classes directory. I try to reference it using this url:
http://localhost/servlet/HelloServlet
Tomcat is configured to use port 80 and has been restarted after adding the servlet class file. Does anyone have a clue why this is not working for me?
Many thanks
Marc

You have to add in the web.xml file that it is in the WEB-INF dir, the information about your servlet. An example:
<web-app>
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/HelloServlet</url-pattern>
</servlet-mapping>
</web-app>

BASIC Questions about JavaMail

Hi Everyone
I have some very basic questions about java mail.
I have a weblogic web server. I think it's version 5 or something like that.
when a user clicks a form on my application sends some information to my database (via my jsp/java program) , I need to send email to a person?
Does anyone know how to do that ?
Could someone please describe the process
Stephen

I would recommend that you first read the JavaMail design specifications http://java.sun.com/products/javamail/JavaMail-1.2.pdf
Then, download JavaMail. It comes with a reference implementation of the API and also very good samples.
Those samples should get you started very quickly on how to send email from Java program.

Question about dependent projects (and their libraries) in 11g-Oracle team?

Hello everyone,
I have a question about dependent projects. An example:
In JDeveloper 10.1.3.x if you had for instance 2 projects (in a workspace): project 1 has one project library (for instance a log4j library) and project 2 is a very simple webapplication which is dependent on project 1. Project 2 has one class which makes use of log4j.
This compiles fine, you can run project 2 in oc4j, and the libraries of project 1 (log4j) are added on the classpath and everything works fine. This is great for rapid testing as well as keeping management of libraries to a minimum (only one project where you would update a library e.g.)
However in 11g this approach seems not to work at all anymore now that weblogic is used, not even when 'export library' is checked in project 1. The library is simply never exported at all - with a noclassdeffound error as result. Is this approach still possible (without having to define multiple deployment profiles), or is this a bug?
Thanks!
Martijn
Edited by: MartijnR on Oct 27, 2008 7:57 AM

Hi Ron,
I've tried what you said, indeed in that .beabuild.txt when 'deploy by default' is checked it adds a line like: C:/JDeveloper/mywork/test2/lib/log4j-1.2.14.jar = test2-view-webapp/WEB-INF/lib/log4j-1.2.14.jar
Which looks fine, except that /web-inf/lib/ is empty. I presume its a sort of mapping to say: Load it like it in WEB-INF/lib? This line is not there when the deploy by default is not checked.
I modified the TestBean as follows (the method that references Log4j does it thru a Class.forName() now only):
public String getHelloWorld() {
try {
Class clazz = Class.forName("org.apache.log4j.Logger");
System.out.println(clazz.getName());
catch(Exception e) {
e.printStackTrace();
return "Hello World";
In both cases with or without line, it throws:
java.lang.ClassNotFoundException: org.apache.log4j.Logger
     at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:283)
     at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:256)
     at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:54)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
     at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:176)
     at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:42)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:169)
     at nl.test.TestBean.getHelloWorld(TestBean.java:15)
Secondly I added weblogic.xml with your suggested code, in the exploded war this results in a weblogic.xml which looks like:
<?xml version = '1.0' encoding = 'windows-1252'?>
<weblogic-web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.bea.com/ns/weblogic/weblogic-web-app.xsd" xmlns="http://www.bea.com/ns/weblogic/weblogic-web-app">
<container-descriptor>
<prefer-web-inf-classes>true</prefer-web-inf-classes>
</container-descriptor>
<jsp-descriptor>
<debug>true</debug>
<working-dir>/C:/JDeveloper/mywork/test2/view/classes/.jsps</working-dir>
<keepgenerated>true</keepgenerated>
</jsp-descriptor>
<library-ref>
<library-name>jstl</library-name>
<specification-version>1.2</specification-version>
</library-ref>
<library-ref>
<library-name>jsf</library-name>
<specification-version>1.2</specification-version>
</library-ref>
</weblogic-web-app>
The only thing from me is that container-descriptor tag, the rest is added to it during the deployment. Unfortunately, it still produces the same error. :/ Any clue?

Question about Weblogic

Hello,
I have a question about Weblogic and would like someone to help me with it.
I created a JSP and everything was doing fine while i was testing it in Tomcat. But once I started the tests with Weblogic, it seemed Weblo wasn't accepting a class that i used to call from my JPS ( a sax parser). Instead of using my parser, Weblogic was using his default SAXParser, what causes problems to my JSP. Trying to solve this, I changed the classpath in Weblo and putted the jar of my parser in the beginning of the classpath, but it still didn't work. Does anyone have an idea of why Weblogic don't accept my parser and uses its default parser instead?
Thanks in advance!!
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naveen.g wrote:
How to get the path of the domain, where my application is running, in a java code?
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Hi
i have some question about upcomming studio 8 if some on know
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4-does it contain wysiwyg for jsp/struts/jsp ?
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Sun Java Studio Enterprise 8 Early Access Program will be started soon.
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The default password for Web Cache is: administrator
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Questions about JavaFX

Hi all,
I'm new to JavaFX. I have a couple of questions about this new technology.
1. Can JavaFX provides a GUI layer like SWING in a standalone application where the GUI collects input and sends a request to the core application?
2. Regarding Web applications, what can JavaFX do? I guess JavaFX allows us to create applets, and it does not provide what JSPs/Servlets or JSF do. Is it right?
Thank you very much!

The new technology is already 6 months old and the version 1.2 have just been released... :-)
Which is good news: yes, JavaFX has now a rather complete GUI layer. Previously it depended on Swing to provide most GUI components, now it has native components.
So it can indeed collect (and display) information and send requests to a server (via HttpRequest class).
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Question about EJB and thread safe coding - asking again!

sorry everyone, no one seems to be interested in helping me on this, so i post it again.
i have a question about the EJB and thread safe coding. when we build EJBs, do we need to worry about thread safe issue? i know that EJBs are single threaded, and the container manages the thread for us. maybe i am wrong about this. if i wasnot, how can we program the EJB so that two or more instance of EJB are not going to have deadlock problem when accessing data resources. do we need to put syncronization in ours beans, do we even need to worry about creating a thread safe EJB? thanks in advance. the question really bothers me a lot lately.

sorry everyone, no one seems to be interested in
helping me on this, so i post it again.Excellent plan. Why not search a little bit on your own instead of waiting for your personal forum slaves to answer your call. See below.
i have a question about the EJB and thread safe
coding. when we build EJBs, do we need to worry about
thread safe issue? Read this: http://forum.java.sun.com/thread.jsp?forum=13&thread=562598&tstart=75&trange=15
i know that EJBs are single
threaded, and the container manages the thread for us.
maybe i am wrong about this. if i wasnot, how can we
program the EJB so that two or more instance of EJB
are not going to have deadlock problem when accessing
data resources. do we need to put syncronization in
ours beans, do we even need to worry about creating a
thread safe EJB? thanks in advance. the question
really bothers me a lot lately.
Java's Thread Tutorial
JavaWorld: Introduction to Java threads
IBM: Introduction to Java threads
Google: java+threads+tutorial

Questions about your new HP Products? HP Expert Day: January 14th, 2015

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Questions about using the Voice Memos app

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Question about somepage.jsp?id=10

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