Difference Betn EJB and Java Bean

what is diference between EJB and Java Bean...???

Is it really necessary to ask the same thing twice??
MeTitus

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Difference between RMI and Java Beans

Hello
I have to develop a program that allow the users to have access to the Patient information . The program will also organize appointment between the users and the patients. + extra thing like agenda .....
I will have about 10 to 20 user that will have access at the same time to the same info .
My question is :what is the best solution for such kind of programes
RMI :after searching in google (it is light weight )
java beans:more powerful than RMI
or maybe thread ???
any one can explain the difference please ?
Thank you

A little [url http://www.google.ca/search?hl=en&q=rmi+ejb&btnG=Google+Search&meta=]google with keywords: rmi ejb would give all the answers you need.
Specifically you could read [url http://www.devx.com/Java/Article/20843/0/page/1]the article from the first result: EJB and RMI: A Practical Introduction.
Also there are many threads from these forums that already answered your question in the past.
Here is one: [url http://forum.java.sun.com/thread.jspa?threadID=539544&messageID=2613399]Rmi and EJB.
Happy reading!
Regards

What's the difference between using java directly in JSP and java bean

What is the difference if I use java code directly in JSP or use java bean in JSP?
Which class to use for receiving the passed parameter from html or java script? Any difference for java code and java bean in the way receiving the passed data?
How can I pass string from jsp to html or java script?

1 Cleaner pages
2 you have to write the class and use set and get methods
3 What do you mean when saying passing string from jsp to html??, do you mean the value you can use <%=variablename%>

Differences between @EJB and @Resouce?

Hi,
I am confused about the differences between @EJB and @Resource?
1.
Can Session Beans be injected for both?
If so what are the pro's / con's?
2.
Are the any difference between the type of components that cna be registered for one but not the other?
3.
Are they both equally usable with the ENC?
Many thanks.

@EJBs are 'special' resources. For example, @EJB (for a stateful session bean) results in
1. Creation of the Stateful Session Bean,
2. Other dependencies are injected into this newly created bean,
3. If the bean has a @PostConstruct bean then that method is invoked (after invoking applicable interceptors)
Hope this helps

Create XML dynamically from schema and Java bean

Hi,
I'm looking for suggestions on the best approach to create an XML file programatically from a schema and Java bean.
The schema used is not fixed and may vary with each request so a dynamic way to create the XML is required.
Is there an API available that allows me to achieve this easily? Any help would be appreciated to point me in the right direction.
Thanks.

XMLBeans or JAXB should work for you.
- Saish

(261680070) Q SYNCH-11 How do my web service methods accees EJBs and java classes?

A<SYNCH-11> How do my web service methods accees EJBs and java classes?
A<SYNCH-11> It is simple to use java classes, just do it as you would ordinarily.
The .jws file really contains a simple class so you can program with it in the same
way that you would use a regular Java class.
To use an EJB you can go and access it directly as you would with any EJB remote
client (lookup home stub, create, etc) or if the EJB is deployed to WLS you can use
a control to provide a very simple wrapper to the EJB. We will see this in detail
on Thursday in the ADVC module.

Futher information about the possibility of callback:
It may be possible for a synchronous only web service (i.e. MS .net) to even paticipant
in the callback functionality of asynchronous web services. If the client implements
the appropriate methods for the callback but listens for them on a different port
or binding than the SOAP request, then web service may be able to build a response
if the client's "callback URL" is submitted as the beginning part of a conversation.
Watch the BEA developer forum (http://dev2dev.bea.com) for more information about
this approach and other tips and techniques for building web services.
"Adam FitzGerald" <[email protected]> wrote:
>
Q<SYNCH-03> I heard that MS .net only implements synchrnonus method? If
this is true.
Does it means my async methods will only work with J2EE clients?
A<SYNCH-03> I do not know the limitations of .net but let me point out that
is very
difficult to provide asynchronous web service method invocation (this is
different
from an asynchronous web service). HTTP as a general communication protocol
is based
on a request and response paradigm so your client libraries will mostly
likely be
expecting a response even if it is empty (check the asynchronous example
from today
to see that the start method still returns an empty response). You must
distinguish
this from the notion of an asynchronous web service which is a business
operation
that occurs on the server whose return value/result is not directly associated
with
building response to the client. An asynchronous web service can (and generally
will)
be started and stopped with web service operations that are invoked synchronously.
Thus MS .net clients can still be client to WLS hosted web services.

EJB or java bean

I have a j2ee application :
- a servlet
- a java bean which access and manipulate oracle database
- JSPs which display results
I would like to know what is the difference between a java bean and an entreprise java bean (EJB) and which is the component more appropriate for my project (an EJB or a java bean) ?
what is better for my project (java bean or an EJB) ? my project is a web application which ask an oracle database and generate an XML file. the user can thanks to this application select the table and the columns he wants and generate an XML file.
Could you help me thank you very much.

If your project is a enterprise level, EJB is preferred, otherwise, java bean is enough.
There is not absolute difference between java bean and EJB. In fact, it's recommended that EJB is called via java bean. There will be too much server side script in the jsp if you call EJB directly in a jsp.

Expose EJB through Java Bean model importer in Web Dynpro

Hi,
I am planning to expose EJB like following:
1. Create Stateless session bean as a façade for DAO access.
2. Create DAO to access database. In my case is Oracle DB
3. Create Java Bean to encapsulate session bean
4. Import java bean model to web dynpro
Few of my business method return the object array e.g. Customer[] which contains all properties of customer, and getter, setter.
Has anyone done this before? Is there any sample code?
Best Regards,
Zhang Yan

Hi
I think u can refer to the following link
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/java/simple java bean generator for database.pdf
Thought this link is also Useful
Creating and Deploying Web Services for an EJB
Wishes
Krishna kanth

Need advice about web services and Java beans

Hi
I am very new to web services and to Java beans as well.
I am trying to understand if and how a web service can use functionality I have in a Java bean. I couldn't find any documentation I can use.
For example:
InitialContext ic = new InitialContext();
Adder adder = (Adder) ic.lookup("ejb/AdderJNDI");In a EJB client project (I'm working with Eclipse) if I add the EJB project to the build path, the Adder interface is recognized.
Theoritacally I thought I can do the same in a web service server project, but the Adder interface is not recognized.
Is there something I can read to understand how I need to use the EJB or implement the web service?
Many thanks
Sigal

Okay....I think I made some errors with the original scenario:
It basically comes down to this....I think. OCS Calendar has a set of Java classes and methods that provide an abstraction for their web services interface. I know how to create something to use these classes using an IDE like JDeveloper, but I'm not sure how that would work with HTML DB.
I've noticed that the SQL Workshop has a place for Java sources and classes, and I've heard mentions of PL/SQL wrapping. Is there a way to import classes into an HTML DB workspace, wrap 'em up, and access them via PL/SQL?
Thanks again,
Jonathan

Memory and java beans

i have servlet that creates a bean that holds some data from a table.
Purpose: not to hit DB2 everytime to build some drop downs on jsp.
We just wanted to have a bean in the memory and access it whenever we need it.
Now, my concern is server memory.
Can someone tell me how does java data beans effect memory?
My java bean holds only plain text from the table.
I think there are over 1300 records. is it worth doing this?
Is there a guide that tells me for how many rows how many MB of ram is used?
thanks
nn

Well you need not worry much about memory as this will be taken care by the Container i.e. EJB Server in general
The EJB Server will serialize the object in the file if it is not used for a certain period of time and again deserialize when the file is used
Bye for now
CSJakharia

User parameter are not show in database using Servlet and java Bean

Hello Sir,
when I insert the parameter in run time, weblogic server and JSP show that parameter are saved.
Allthough row increment in database but they not show in database.
Here My Code:
login.html:
<html>
<head>
<title>A simple JSP application</title>
<head>
<body>
<form method="get" action="tmp" >
Name: <input type="text" name="user">
Password: <input type="password" name="pass">
<input type="Submit" value="Submit">
</form>
</body>
</html>LoginServlet.java:import javax.servlet.*;
import javax.servlet.http.*;
public class LoginServlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException{
try
String user=request.getParameter("user");
String pass=request.getParameter("pass");
co.SimpleBean st = new co.SimpleBean();
st.setuserName(user);
st.setpassword(pass);
request.setAttribute("user",st);
request.setAttribute("pass",st);
RequestDispatcher dispatcher1 =request.getRequestDispatcher("submit.jsp");
dispatcher1.forward(request,response);
catch(Exception e)
e.printStackTrace();
}SimpleBean.java:
package co;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SimpleBean {
private String user="";
private String pass="";
private String s="";
public String getuserName() {
return user;
public void setuserName(String user) {
this.user = user;
public String getpassword() {
return pass;
public void setpassword(String Pass) {
this.pass= pass ;
public String issueData()
try
System.out.println("Printed*************************************************************");
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Connection loaded");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@VijayKumar-PC:1521:XE","SYSTEM","SYSTEM");
System.out.println("Connection created");
PreparedStatement st=con.prepareStatement("insert into vij2 values(?,?)");
System.out.println("~~~~~~~~~~~~~~~~~~~~");
String NAME=getuserName();
st.setString(1,NAME);
String PASSWORD=getpassword();
st.setString(2,PASSWORD);
st.executeUpdate();
System.out.println("Query Executed");
con.close();
s= "Your logging is saved in DB ";
System.out.println("Your logging is saved in DB *****************");
return(s);
catch(Exception e)
e.printStackTrace();
return "failed";
}submit.jsp:This is Submit page
<jsp:useBean id="st" class="co.SimpleBean"/>
<jsp:setProperty name="st" property="*" />
<jsp:getProperty name="st" property="userName" /> <br>
<jsp:getProperty name="st" property="password" /> <br>
<% st.issueData();%>
<%
out.println("Ur data is saved in DB");
%>Please Help me.
Thanks.

Ok, this seems to be a long and convoluted path to do absolutely nothing.
You submit the form.
You run a servlet that gets the parameters correctly (good), creates a SimpleBean (good) and then sets this into request attribute space under the names "user" and "pass" - (why?)
You then forward to the jsp: submit.jsp.
Submit.jsp creates a new SimpleBean, and attempts to populate it with <jsp:setProperty>. You then call the issueData method on it.
Your complaint: Rows are being created in the database which have empty string values instead of the parameters you have passed.
So, why are the values blank? Where do you think these values should be coming from?
Looking at SimpleBean we find one mistake - you have mis-named your get/set methods.
To properly follow java beans standards, you should use camel-case for your methods.
Rather than getuserName() the method should be getUserName(). getpassword() should be getPassword() etc etc.
The method getUserName() defines a property "userName" for the bean.
Once that is fixed, lets go to submit.jsp. The <jsp:setProperty> statement will try and set all properties of the bean from the request parameters.
There are no request parameters "userName" or "password" so those values don't get set in the bean, therefore it uses their default value of empty string - "".
There ARE request parameters called "user" and "pass" but because they aren't properties of the bean, they get ignored.
As a result, the values are empty string, and that is exactly what gets inserted into the database.
Ways to fix this
1 - rename your parameters on your form to be "userName" and "password" to match the bean. That way the <jsp:setProperty> tag will populate them properly.
or
2 - Call issueData() method from your servlet after you have created the SimpleBean. Better in my opinion as you then don't have any scriptlet code on a JSP page.
Cheers,
evnafets

Forms 6i and Java Bean

Hi
I need to establish communication between my forms and java code.
i have made a java bean and set the implementation class path(i.e the package path (oracle.forms.demo for the bean class)) in the form item.
I want to know where exactly should put the java code or do i have to make modification in any of the environment variables to allow the forms to acces the java code.
what exactly is a java class and do i need to have a wrapper class also to implement the java bean.
please respond fast as i need this info urgently...any small info might prove fruitful
Thanks
Message was edited by:
user532526

Hello,
All you have to do is to copy the .jar file that contains the Java class(es) in the <devsuite>/forms/java/ directory, configur the <devsuite>/forms/server/formsweb.cfg file to add this jar file to the archive_jini tag to indicate where Forms have to load the classes:
archive_jini=frmall_jinit.jar,...,my_jar_file.jar
Then after, you have 2 possibilities:
- the bean does not have any "screen" representation so you can just handle its functions with the Forms internal FBean package functions (no need to put implementation class on the bean area item property)
- it has a screen representation, so you put its implementation class like you did, and you set its properties with the Set_Custom_Property() built-in and get its properties with the Get_Custom_Property() built-in.
Francois

New to Jsp. Jsp and java bean not running

hi
i have created a simple jsp file and using a java bean. but it is showing errors. my file directory structure in tomcat4.1 is:
aptechsamples:
index.jsp
WEB-INF/classes:
myPackage:
Counter.class
i have no web.xml file i dont know how to use it or not. i need it or not.
the index.jsp file:<html>
<head><title> A Simple JSP Bean </title></head>
<body>
<%@ page language ="java" %>
<%@ page import ="mypackage.Counter" %>
<jsp:useBean id="id_counter" scope="session" class ="Counter"/>
<jsp:setProperty name="id_counter" property="count" param="count" />
<jsp:getProperty name="id_counter" property="count" />
</body>
</html>the Counter.java file is: package mypackage;
public class Counter{
     String msg;
     public Counter(){
          msg = "Hello World";
     public String getCount(){
          return msg;
     public void setCount(String c){
          msg = c;
}please help me and tellme what the hell is wrong with it or me. im getting an error:
exception
org.apache.jasper.JasperException: Cannot create bean of class Counter

Java is already telling you what is wrong: it cannot create an instance of your Counter class. The reason being: it can't find it.
What do you mean by "myPackage"? Before you can use any class in your JSP's or servlets, they MUST be stored in a package. If you don't know what that is, I highly suggest you lookup "java package" and "java classpath" using google.
Let's say your Counter class is in a package mypackage (so it starts with the line package mypackage;). Then you have to store the .class file as:
WEB-INF/classes/mypackage/Counter.class
If done correctly, the error message should disappear.

How to include PJC and Java Beans in forms

I have tried a lot to include java codes in my forms ..So I decide to start with ProgressBarPJC(cause it is tested and provided with demo) but I could not set implementation class of java bean object to
oracle.forms.demos.ProgressBarPJC it does not accept it but it accept ProgressBar instead of ProgressBarPJC. I don't know why? I have made changes in Forms90_builder_classpath to access f90all.jar and progressbar.jar. I have Progressbar.class and progressbarpjc.classs both but i don't know how to set implementation class to ProgressBarPJC.
don't you think there is lots of configuration and path setting to use any JPC or Jar in forms? I am totally confused with this integration.
Please solve this matter
Thanking you,
Neeraj

and even more information samples and step by step instructions are on the Java spotligh on the Forms Upgrade Center : http://otn.oracle.com/formsupgrade

First use of jsp and java bean and "Unable to compile class for JSP" error

Hi,
I am trying to create my first jsp + java bean and I get a basic error (but I have no clue what it depends on exactly). Tomcat seems to cannot find my class file in the path. Maybe it is because I did not create a web.xml file. Did I forgot to put a line in my jsp file to import my bean?
Thank you very much for your help.
Here is my error:
An error occurred at line: 2 in the jsp file: /login.jsp
Generated servlet error:
[javac] Compiling 1 source file
/usr/local/tomcat/jakarta-tomcat-5/build/work/Catalina/localhost/test/org/apache/jsp/login_jsp.java:43: cannot resolve symbol
symbol : class CMBConnect
location: class org.apache.jsp.login_jsp
CMBConnect test = null;
I only have this in my directory:
test/login.jsp
test/WEB-INF/classes/CMBConnect.java
test/WEB-INF/classes/CMBConnect.class
Do I need to declare another directory in classes to put my class file in it and package my bean differently?
Here is my login.jsp:
<%@ page errorPage="error.jsp" %>
<jsp:useBean id="test" type="CMBConnect" scope="session" />
<html>
<head>
<title>my test</title>
</head>
<body>
<h3>Login information</h3>
<b><%=session.getValue("customerinfo.message")%></b>
<form> ....... </form>
</body>
</html>
and here is my CMBConnect.java:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class CMBConnect
public CMBConnect () { }
public String openConnection(String id, String password) {
String returnText = "";
try {
Connection con = null;
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
con = DriverManager.getConnection("jdbc:oracle:thin:@myserver.abc.com:1521:TEST", id, password);
if(con.isClosed())
returnText = "Cannot connect to Oracle server using TCP/IP...";
else
returnText = "Connection successful";
} catch (Exception e) { returnText = returnText + e; }
return returnText;
Thanks again!

Thanks for you help
I created the package and I get this error this time:
javax.servlet.ServletException: bean test not found within scope
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:822)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:755)
     org.apache.jsp.login_jsp._jspService(login_jsp.java:68)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:268)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:277)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:223)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

Difference Betn EJB and Java Bean

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