jsp and ejb

[jonny jinny]

I am trying to access container managed bean from jsp using a java bean.
It gives me following err arsing of JSP File '/TestJSP.jsp' failed:
--------------------------------------------------------------------------------
/TestJSP.jsp(7): class 'examples.ejb20.basic.containerManaged.AccountJB' could not be loaded
probably occurred due to an error in /TestJSP.jsp line 7:
<jsp:useBean id="account" scope="request" class="examples.ejb20.basic.containerManaged.AccountJB" />

[Nigel Browne]

could it be that your missing the E out of EJB

[Chris Mathews]

Originally posted by jonny jinny:
I am trying to access container managed bean from jsp using a java bean.
It gives me following error parsing of JSP File '/TestJSP.jsp' failed:
--------------------------------------------------------------------------------
/TestJSP.jsp(7): class 'examples.ejb20.basic.containerManaged.AccountJB' could not be loaded
probably occurred due to an error in /TestJSP.jsp line 7:
<jsp:useBean id="account" scope="request" class="examples.ejb20.basic.containerManaged.AccountJB" />
There is a big difference between JavaBeans and Enterprise JavaBeans(EJBs).
The useBean tag is meant to be used with JavaBeans, not EJBs. There is a alot more that goes into using an EJB... acquiring an initial context, looking up the home interface, getting an EJBObject, invoking the business method, etc.
If you really want to use the useBean tag to access your EJB, then you will need to wrap it with a standard JavaBean. Some tools, such as WSAD, provide this functionality for you. Overall, abstracting the details of EJB access from the client is a good thing.
Take a look at the Business Delegate Pattern.
Since we are on the subject, it is also not advisable to directly access Entity Beans from the client.
Take a look at the Session Facade Pattern.
[ March 27, 2003: Message edited by: Chris Mathews ]

[jonny jinny]

Hi!!
I am doing the same.
accessing AccountJB which is a java bean who in turn accesses EJB.

[jonny jinny]

Hi,
Here is the code written in AccountJB.
Its giving the following err to me:
C:\bea\wlserver6.1\config\examples\clientclasses>java examples.ejb20.basic.conta
inerManaged.AccountJB
Unable to lookUp1
Prob in lookup
---------
CODE;

public class AccountJB{
  private String url= "t3://localhost:7001";
  private String accountId ="10020";
  private AccountHome home;
public static void main(String args[]){
AccountJB acc= new AccountJB();
try{
 acc.lookupHome();
}catch(Exception e){
  log("Prob in lookup");
}
}

public AccountJB() {

/*try{
home= lookupHome();
runPartA();
}catch(Exception e){
  log("Prob creating the account bean");
}*/
}
private AccountHome lookupHome() throws NamingException{
Context ctx= getInitialContext();
try{
Object home = ctx.lookup("ejb20-containerManaged-AccountHome");
log("lookedUp");
return (AccountHome) PortableRemoteObject.narrow(home,AccountHome.class);
}catch(NamingException ne){
log("Unable to lookUp1");
throw ne;
}
}
 private Context getInitialContext() throws NamingException {
       return new InitialContext();
     }
 
  private static void log(String s) {
    System.out.println(s);
  }

---------
(edited by Cindy to format code using [ code] and [ /code] tags without the spaces)
wht could be the prob, please help.
[ March 28, 2003: Message edited by: Cindy Glass ]