Hello,
I am using the
J2EE 1.3 Reference Implementation and here are the files I created:
===========================================================================
The Client:
package umk.bank.interest;
import java.rmi.*;
import javax.rmi.*;
import javax.ejb.*;
import javax.naming.*;
/**
*
Test Client for 'Interest' EJB.
*/
public class TestClient {
public static void main (
String args []) throws Exception {
Interest interest = getInterest();
double principal = 10000.00;
double rate = 10.00;
int terms = 10;
System.out.println("Principal = $" + principal);
System.out.println("Rate(%) = " + rate);
System.out.println("Terms = " + terms);
System.out.println("Interest = $" +
interest.getInterestOnPrincipal(principal, rate, terms));
System.out.println("Total = $" + interest.getTotalRepayment (principal, rate, terms));
interest.remove();
}
===========================================================================
/**
* Get an instance of the Interest EJB.
*/
public static Interest getInterest() throws
CreateException, RemoteException, NamingException {
InitialContext initialContext = new InitialContext();
Object o = initialContext.lookup("Interest");
InterestHome = (InterestHome)
PortableRemoteObject.narrow(o, InterestHome.class);
return home.create();
}
}
===========================================================================
The EJBHome interface:
package umk.bank.interest;
import java.rmi.*;
import javax.ejb.*;
/**
* Remote home interface (factory interface) for Interest EJB.
*/
public interface InterestHome extends EJBHome {
/**
* Factory method for creating an instance of the EJB.
*/
public Interest create () throws CreateException, RemoteException;
}
===========================================================================
The EJBLocal interface:
package umk.bank.interest;
import java.rmi.*;
import javax.ejb.*;
/**
* Local interface for business methods
* that use the 'Interest EJB'
*/
public interface InterestLocal extends EJBLocalObject {
/**
* Calculate the interest payable on a certain principal,
* at a specified interest rate per term, for a specific
* number of terms.
*/
public double getInterestOnPrincipal(double principal, double interestPerTerm, int terms);
/**
* Calculate the total amount payable on a certain principal,
* at a specified interest rate per term, for a specific number
* of terms.
*/
public double getTotalyRepayment (double principal, double interestPerTerm, int terms);
}
===========================================================================
EJB Local Home Interface:
package umk.bank.interest;
import java.rmi.*;
import javax.ejb.*;
/**
* Local home interface for 'Interest' EJB.
*
* Used for EJB that reside in the same server (JVM).
*/
public interface InterestLocalHome extends EJBLocalHome {
/**
* Factory method that creates a local instance
* of the 'Interest' EJB.
*/
public InterestLocalHome create() throws CreateException;
}
===========================================================================
The Remote Interface:
package umk.bank.interest;
import java.rmi.*;
import javax.ejb.*;
/**
* Remote interface for distributed access.
*
* This interface defines the business methods used
* by the Interest EJB.
*/
public interface Interest extends EJBObject {
/**
* Calculate the interest payable on a certain
* principal, at a specified (percent) interest
* rate per term, for a specific number of terms.
*/
public double getInterestOnPrincipal(double principal, double interestPerTerm, int terms) throws RemoteException;
/**
* Calculate the total amount payable on a certain
* principal, at a specified (percent) interest rate
* per term, for a specific number of terms.
*/
public double getTotalyRepayment(double principal, double interestPerTerm, int terms)throws RemoteException;
}
===========================================================================
Actual bean implementation:
package umk.bank.interest;
import javax.ejb.*;
/**
* Actual implementation for the 'Interest' EJB.
*/
public class InterestBean implements SessionBean {
/**
* Keep a reference to the session context object.
*/
protected SessionContext sessionContext;
/**
* Calculate the interest payable on a certain
* principal, at a specified (percent) interest
* rate per term, for a specific number of terms.
*/
public double getInterestOnPrincipal(double principal, double interestPerTerm, int terms) {
log ("Called getInterestOnPrincipal");
return principal * Math.pow((1 + interestPerTerm / 100.0), terms) - principal;
}
/**
* Calculate the total amount payable on a certain
* principal, at a specified (percent) interest rate
* per term, for a specific number of terms.
*/
public double getTotalyRepayment(double principal, double interestPerTerm, int terms) {
log ("Called getTotalRepayment");
return principal * Math.pow ((1 + interestPerTerm / 100.0), terms);
}
/**
* Set sessionContext is called by the container
* on initialization; conventionally we store
* the passed reference to a SessionContext object.
*/
public void setSessionContext(SessionContext object) {
this.sessionContext = sessionContext;
log("Called setSessionContext");
}
/**
* ejbCreate is called on initialization.
*/
public void ejbCreate() {
log ("Called ejbCreate");
}
/**
* ejbRemove may be called when the container tidies
* up the EJB instance pool (stateless session), or when
* the client class remove(stateful session).
*/
public void ejbRemove() {
log("Called ejbRemove");
}
/**
* ejbActivate is associated with memory management in
* stateful session EJBs; in stateless session EJBs,
* it is never called / invoked.
*/
public void ejbActivate() {
log("Called ejbActivate");
}
/**
* ejbPassivate, same commentary as with ejbActivate.
*/
public void ejbPassivate() {
log("Called ejbPassivate");
}
/**
* Dump a message to a standard out, and thereby
* to the server's log mechanism.
*/
public void log(String s) {
System.out.print("Interest: ");
System.out.println(s);
}
}
===========================================================================
All of these are in the a directory called F:\DevProjects\Java Projects\J2EE Projects\Bank\src
I have another directory that is in the same level as 'src' called 'dist',
When I compiled everything by using:
F:\DevProjects\Java Projects\J2EE Projects\Bank\src\javac -d ..\dist *.java
Everything compiled except for the TestClient class, here were the errors:
F:\DevProjects\Java Projects\J2EE Projects\Bank\src>javac -d ..\dist *.java
TestClient.java:23: cannot resolve symbol
symbol : method getTotalRepayment (double,double,int)
location: interface umk.bank.interest.Interest
System.out.println("Total = $" + interest.getTot
alRepayment(principal, rate, terms));
^
TestClient.java:34: cannot resolve symbol
symbol : variable InterestHome
location: class umk.bank.interest.TestClient
InterestHome = (InterestHome)
^
TestClient.java:36: cannot resolve symbol
symbol : variable home
location: class umk.bank.interest.TestClient
return home.create();
^
3 errors
===========================================================================
When I tried to append the my CLASSPATH, I got 6 errors instead of 3:
F:\DevProjects\Java Projects\J2EE Projects\Bank\src>javac -d ..\dist -classpath
%CLASSPATH%;dist TestClient.java
TestClient.java:30: cannot resolve symbol
symbol : class Interest
location: class umk.bank.interest.TestClient
public static Interest getInterest() throws
^
TestClient.java:14: cannot resolve symbol
symbol : class Interest
location: class umk.bank.interest.TestClient
Interest interest = getInterest();
^
TestClient.java:34: cannot resolve symbol
symbol : variable InterestHome
location: class umk.bank.interest.TestClient
InterestHome = (InterestHome)
^
TestClient.java:34: cannot resolve symbol
symbol : class InterestHome
location: class umk.bank.interest.TestClient
InterestHome = (InterestHome)
^
TestClient.java:35: cannot resolve symbol
symbol : class InterestHome
location: class umk.bank.interest.TestClient
PortableRemoteOb
ject.narrow(o, InterestHome.class);
^
TestClient.java:36: cannot resolve symbol
symbol : variable home
location: class umk.bank.interest.TestClient
return home.create();
^
6 errors
===========================================================================
My CLASSPATH is:
F:\DevProjects\Java Projects\J2EE Projects\Bank\src>echo %CLASSPATH%
.;F:\DevTools\Java\JMF21~1.1E\lib\sound.jar;F:\DevTools\Java\JMF21~1.1E\lib\jmf.
jar;F:\DevTools\Java\JMF21~1.1E\lib;.;F:\DevTools\Java\j2sdk1.4.2_04\lib\tools.j
ar;F:\DevTools\Java\j2sdk1.4.2_04\jre\lib\rt.jar;F:\DevTools\Java\Tomcat\jakarta
-tomcat-5.0.19\common\lib\servlet-api.jar;F:\DevTools\Java\Tomcat\jakarta-tomcat
-5.0.19\common\lib\jsp-api.jar;F:\DevTools\Java\j2sdkee1.3.1\lib\j2ee.jar
===========================================================================
I am using the J2EE Reference Implementation 1.3 on WinXP.
Can anyone help?
--------------------
Unnsse M. Khan
Sun Certified Programmer for the
Java 2 Platform 1.4
