Using a Bean

Hi, I'm a beginner in JSP programming, and I'm developing under tomcat web server. I'm using this path for put my JSP home page: ".../WEBAPP/myApp". I need to know where I must put a class file (is a bean!) in the application path (may be "/WEBAPP/myApp/classes"?).
... and more, I must set something in the application XML file?
Thanks in advance

I think you've posted this in the wrong forum.

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How can i design a EJB application using session Beans?

Hello,
I am designing a Find application using EJB. Here a user is prompted a search page, where he can enter the search criteria's. Then on click of submit, the query is formed at the server side depending on what criteria's were selected. Then a jdbc query is performed and the results are returned back to the user. Here no session is maintained for the users. Can anyone suggest me how to design this application using EJB. Should i use entity beans for this or session beans will suffice? Should the jdbc query be performed in the bean itself or should it be outside in a helper class? Please kindlu suggest me the design for this application...
Regards,
Subbu

Hi,
First of all, I'm unable to figure out why you need to use EJB for this scenario. You can write a helper class to frame and execute the query.
If you really want to use EJB, then I suggest you use a stateless Session Bean with transaction attribute as TX_NOT_SUPPORTED. From the session bean, you can call the helper class. But, by avoiding the session bean, you can eliminate remote calls, thus improving your performance. Also, check if the database & the db driver you are using supports sql caching.
Regards,
Raj.

How do I use a bean to determine which message bundle value to use?

Is there a way to use a bean to determine which message from my message bundle I use? I want to be able to call my bean in JSF/JSP page, have the bean return a String, and use that String to pick a message from my message bundle properties file. Now I can do this:
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Ah this way. So you want that much of nasty if statements in the bean instead? ;)
Then make use of the fact that you also can access Map values using the brace notation. E.g.
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Insert data into table from JSP page using Entity Beans(EJB 3.0)

I want to insert data into a database table from JSP page using Entity Beans(EJB 3.0).
1. I have a table 'FRIENDS', (in Oracle 10g database).
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5. I am using JDev as editor.
Please provide me code ASAP or link with similar example.
Thank you.
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Hi,
I am also trying that scenario. So u can
Post the jsp form data to a Servlet which will act as a Controller.
In the servlet invoke the business method.
Similar kind of app is in www.roseindia.net
Hope this would help u.
Meanwhile if u get any optimal solution, pls post it.
Thanks,
Happy Java Coding.

Problem using a bean in JSP on Tomcat 5.0.28

Hi,
I'm new to JSP, I've installed Tomcat 5.0.28 and I'm able to run JSP but when I try an asp wich uses a bean it gives me this error, the directory structure is
testingProject with the first.jsp
testingProject\WEB-INF\classes\myPackage with the test.class
the first.asp
<%@ page import="myPackage.Test" %>
<html><head><title>Test</title></head>
<body bgcolor=white>
<jsp:useBean id="list" class="myPackage.Test"> </jsp:useBean>
<jsp:getProperty name="list" property="value1" />
<%=list.value1%>
<p>
</body></html>
the Test.java
package myPackage;
public class Test{
String value1="testinggggggggg";
public void Test(){
public String getValue1(){ return value1}
the error
thanks in advance
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 6 in the jsp file: /first.jsp
Generated servlet error:
C:\Program Files\Apache Group\Tomcat 5.0\work\Catalina\localhost\testingProject\org\apache\jsp\first_jsp.java:60: cannot resolve symbol
symbol : variable value1
location: class myPackage.Test
out.print(list.value1);
^
1 error
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332)
     org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)

There are two ways of getting info from the bean.
1) the jsp:getProperty tag, which seems correct in your code
2) the <%= ... tag. In that case you must write a valid java expression. In your case: list.getValue1()

Error in Java based iView when trying to use J2EE bean

I am trying to create a iView based on Java Portal app.
[Java portal app has dynPage based Portal App Object]
I created a PAR and uploaded to Portal. I created iView and worked it fine in (preview).
[iView created using "Content Administration -> Portal Content -> New From Par -> iView"]
I deleted my iView and removed my archive (using "Java Developer -> Portal Archive Deployer/Remover").
I changed java portal project so that I can reference a bean from J2EE app already deployed on server.
[Edited Portalapp.xml to add a
<property name="PrivateSharingReference" value="SAPJ2EE::service:p4, SAPJ2EE::test.myApp/myBean"/>
This time PAR installs fine, but when I try to preview iView, get following error.
Portal Runtime Error
An exception occurred while processing a request for :
iView : N/A
Component Name : N/A
com/sapportals/portal/htmlb/page/PageProcessorComponent.
Exception id: 02:36_11/08/05_0016_4991450
See the details for the exception ID in the log file
I removed "SAPJ2EE::test.myApp/myBean" from portalapp.xml and rebuilt PAR and rebuilt iView but I get same error as above.
1. Where are logs located (for iView errors)?
2. Any pointers on using J2EE bean? (I am trying to use step described in topic "J2EE Applications Access from Portal Applications" from manuals).
3. Do I need to reference any additional libraries to use p4?
Thanks.

The problem seems to be in portalapp.xml
I created second PrivateSharingReference in it
<property name="PrivateSharingReference" value="com.sap.portal.htmlb">
<property name="PrivateSharingReference" value=" SAPJ2EE::service:p4, SAPJ2EE::test.myApp/myBean"/>
I changed to be one entry only like
<property name="PrivateSharingReference" value="com.sap.portal.htmlb, SAPJ2EE::service:p4, SAPJ2EE::test.myApp/myBean"/>
Now iView works again....But still donot know where log is..

How to read a local file from Forms10g using PJC/Bean

I'm trying to read a file on the client machine using a Bean.
The code in the Bean is:
File fp = new File(mFileName);
printToConsole( "AFTER creating a File object " );
if (fp.exists())
I get the message after creating File object. But at the next statement - fp.exists() - the Forms session terminates giving a FRM-92100 - Your connection to the server was interrupted.
Any ideas?
Thanks in advance for your help.
Amit

Frank, Thank you for your response on signing the jar. That was exactly what I was missing. After signing the jar, I am able to do client level operations.
Grant, Thank you for asking about WebUtil. To give you a background as to what we are trying to do - to integrate our Forms 10g application with another software - in this case a client-server app. We want to send a message from this app. to our Forms10g app.(a pre-defined Form in the app.) which would initiate certain Forms navigation based on the message. In essence, Forms needs to be "listening" to this app. (in a non-blocking mode, the Forms app. should not be "locked-out" while listening for a message)
The only way I could think of was to write a Bean (modified version of Frank's Dispatch Event sample on his blog) which would spawn a thread and listen for a message from the other app. For our prototype, I started off with watching for a file on the client machine. The final goal is to listen for a message on MQ. This will facilitate us to integrate our Forms10g app. with any other app.
Regarding WebUtil, I did not find a way to do the listening/polling in a non-blocking way. Maybe I must have missed the obvious - Frank can very well attest to that.
Any feedback is most welcome.
Thanks.
Amit

Using a bean in a servlet

In my application I am having:-
1)- a table in my database which contains the details of the user profile.
2)- a bean which contains the string variables for all the user details along with the getters and setters.
3)- a servelet and a jsp.
In servlet I want to fetch entire data of the table and want to assign the values to the setters of the bean.
in jsp I want to call that bean and want to use its getters to display the entire profile of the user.
I am finding compleatly unable to use the bean in the servlet, please help me out.

hi,
try like this..
after fetching all of your datas
store in setter method of the bean.
pass it as session.setAttribute ( "beanname", bean);
in jsp
get that session attribute
beanname b = (beanname) session.getAttribute ( "beanname" ) ;
<%=b.getMethod ()%>

Defining the path for the use of beans in a JSP

          Hello,
          I would like to use a bean in a JSP file, via the <jsp:usebean> directive.
          I didn't find any property (weblogic property) which could define the path
          to the directory of my beans classes.
          So :
          1) i have put the path of this directory in the weblogic classpath in the weblogic
          start script.
          2) i made the same with the java classpath.
          Both solutions don't work at all.
          Any suggestion would be appreciated.
          Thanks in advance.


          We use the \weblogic\myserver\serverclasses for beans..
          of course we pack beans into jar files, and these jar files are included into
          the wls classpath..
          "Sylvain R." <[email protected]> wrote:
          >
          >Hello,
          >I would like to use a bean in a JSP file, via the <jsp:usebean> directive.
          >I didn't find any property (weblogic property) which could define the
          >path
          > to the directory of my beans classes.
          >So :
          >1) i have put the path of this directory in the weblogic classpath in
          >the weblogic
          >start script.
          >2) i made the same with the java classpath.
          >
          >Both solutions don't work at all.
          >
          >Any suggestion would be appreciated.
          >Thanks in advance.
          >

Using JSP-Beans in Apache

Hi all!
I'm trying to deploy a jsp page in Tomcat 4.1.19. This page uses Java Beans to set and get various properties. I've put the class file of Java Bean in WEB-INF/classes directory and jsp page in Dir root. But whenever I run the jsp page it shows error page saying the bean name as unresolved symbol.
Please tell me the steps that are involved in setting up a Java Bean for jsp in tomcat and also if any special lines are needed to be added to Deployment Descriptor.
Thanx
Varun

sorry for tha :) maybe my english sucks to much...
here's what sun says:
"Note: In the section JSP Scripting Elements we mentioned that you must import any classes and packages used by a JSP page. This rule is slightly altered if the class is only referenced by useBean elements. In these cases,
---***you must only import the class if the class is in the unnamed package***---.
For example, in What Is a JSP Page? (page 246), the page index.jsp imports the MyLocales class. However, in the Duke's Bookstore example, all classes are contained in packages and thus are not explicitly imported."
as mentioned here:
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/JSPBeans4.html#64054

Search in form by using java bean or PJC.

hi all
i am confused because i do not know java bean to much,is it possible to create a search button with one text item in java bean to display all records
example:
if i enter dept 10 then it display all records related to dept 10?
is it possible?
if yes please cany anyone send me a demo?
here is my email add.
[email protected]
sarah

hi
Francois thanks for the link and its very useful and i am studying the codes and also i downloaded demos and run them its working fine and its very very nice.
i like java and trying to learn and its very useful.
why i want to use java bean because one of my friend her name is sheela she wants me to do it but i am failed i did not do it in java bean
so i thought lets try on the forum may be someone help u.
so i posted a thread over here.
thanks Francois.
u r appreciated.once again thanks.
sarah

Using java bean with jsp

hello friends,
i'm new to jsp. i want to create an html form that accepts username and a value from four radio buttons and display back the entered name and checked radio button's value using java bean.
i use the <jsp:setProperty id="" property="*"> method. i don't know how to access the radio buttons value from the html.
also when i use an additional field other than username the jsp page is showing error.
Please give me the correct method to use java bean with jsp in this circumstance.
thank you.

thank you, but i have a problem left. the case is like this.
i got the jsp and bean worked fine when i have a sinle input text field.
but when i added a second text field i recieved the following error.
javax.servlet.ServletException: basket.newbean.getUserPass()Ljava/lang/String;
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     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
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     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
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     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
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pls hlp.

Using web beans in JSP

I would like to know how create a tree using Web Beans that Jdeveloper provides. Using the web object editor I could add two Beans which mapped to JSTree and JSTreeData(in oracle.jdeveloper.jsp.wb package), though I don't know the difference between them. I tried to include Both these beans in the JSP(which appear as tags) but I am unable to render the tree. Let's say I have a parent node (text: row1, url: url1, 3 childs) and 3 child nodes (text: row2..row4, url: url2..url4, each with no childs). How do I write it in the JSP to render it properly
-Rajeev

I would like to know how create a tree using Web Beans that Jdeveloper provides. Using the web object editor I could add two Beans which mapped to JSTree and JSTreeData(in oracle.jdeveloper.jsp.wb package), though I don't know the difference between them. I tried to include Both these beans in the JSP(which appear as tags) but I am unable to render the tree. Let's say I have a parent node (text: row1, url: url1, 3 childs) and 3 child nodes (text: row2..row4, url: url2..url4, each with no childs). How do I write it in the JSP to render it properly
-Rajeev

Using BI Bean in JSP

Hi,
Can anyone please provider some pointers on using BIBeans in a JSP page. There are few options in my knowledge.
1)Using BI-Beans API for writing our own JSP tags.
2)In Jdev(10g) there seems to be some support for Graphs through ADF.
3)JSP and UIX tags provided BI-Graph beans.
thanks
Rahul

U may be used the code similar to following :
Context context = new InitialContext.();
Object obj = (Object)context.lookup("Your JNDI name");
YourHome home = (YourHome)obj.portableRemoteObject.narrow(obj,
YourHome.class);
YourRemote remote = home.create();
System.out.println("your Business methods : "+remote.businessMethod1());
Put this code or whatever code used in ur console client in JSP and invoke the businessMethods using remote object.
I worked with BEAWeblogic 5.1, I think similar case may be there with BEA Weblogic7 also.
First, make a jar file with ome.Remote and Bean by using the deploymenttool, then compile with ejb compiler, the new Jar is the complete deployable file. Take this file and register in weblogic.properties file that is specify the path of the Jar file in the weblogic.properties file. and put the JSP in public-html directory and start the server. if the bean is deployed successfully, open JSP file in a browser then it will work.... if the bean is not deployed you won't get any result.
I can say, just placing the initialContext part of code on the JSP and running the JSP. I think, this may helps u...
Ramana

Why use Java Beans?

Why should we use java beans?
Everybody says it is used to set the properties. What does this mean?
Can anyone give me a realtime scenario of the problems it can solve?
How does Spring framework utilize beans to solve problems? i.e wiring beans, declaring them in context file.

shalearns wrote:
Why should we use java beans?[http://java.sun.com/docs/books/tutorial/javabeans/index.html]
Everybody says it is used to set the properties. What does this mean?[http://java.sun.com/docs/books/tutorial/javabeans/whatis/index.html]
Can anyone give me a realtime scenario of the problems it can solve?[http://java.sun.com/docs/books/tutorial/javabeans/nb/index.html]
How does Spring framework utilize beans to solve problems? i.e wiring beans, declaring them in context file.[http://static.springframework.org/spring/docs/1.2.x/reference/beans.html]
~

How to use Java Beans In JSTL?

Hi
I want to know how to use Java bean in JSTL
please explain this with giving any one example.
Thanks-
Swapneel

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Using a Bean

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