Problem invoking EJB from client

Question

I'm using J2EE 1.4 to package this application
but I get an internal error when trying to call the servlet client
here are the codes for the stateless Bean
import java.util.*;
import java.io.*;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
public class LoanBean implements SessionBean
private javax.ejb.SessionContext m_ctx = null;
public void setSessionContext(SessionContext ctx)
     m_ctx = ctx;
public void ejbCreate() throws java.rmi.RemoteException,javax.ejb.CreateException
     System.out.println("ejbCreate() on obj" + this);
public void ejbRemove()
     System.out.println("ejbRemove() on obj" + this);
public void ejbActivate()
     System.out.println("ejbActivate() on obj" + this);
public void ejbPassivate()
     System.out.println("ejbPassivate() on obj" + this);
public float calculateInterest(float rate, float time, float amount)throws java.rmi.RemoteException
     float interest = time * amount * (rate/ 100);
     return interest;
the code for the home interface
import javax.ejb.EJBHome;
public interface LoanHome extends EJBHome
     public Loan create() throws java.rmi.RemoteException,javax.ejb.CreateException;
the code for the remote interface
import javax.ejb.EJBObject;
public interface Loan extends EJBObject
     public float calculateInterest(float rate, float time, float amount)throws java.rmi.RemoteException;
and here is the code for my servlet client
import java.io.*;
import javax.servlet.*;
import javax.naming.*;
import javax.servlet.http.*;
import javax.rmi.PortableRemoteObject;
import javax.ejb.*;
public class LoanServlet extends HttpServlet
     public void doGet(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException
          PrintWriter out = res.getWriter();
          res.setContentType("text/html");
          float rate = Float.valueOf(req.getParameter("rate")).floatValue();
          float time = Float.valueOf(req.getParameter("time")).floatValue();
          float amount = Float.valueOf(req.getParameter("amount")).floatValue();
          Loan myLoanRemote = null;
          LoanHome myLoanHome = null;
          InitialContext initCon = null;
          try
               initCon = new InitialContext();
          catch(Exception e)
               out.println("First" + e.toString());
          try
               String JNDIName = "ejb/SimpleLoan";
               Object obj = initCon.lookup(JNDIName);
               myLoanHome = (LoanHome)PortableRemoteObject.narrow(obj, LoanHome.class);
          catch(Exception e)
               out.println("Second" + e.toString());
          try
               ****myLoanRemote = myLoanHome.create();
          catch(CreateException e)
               out.println("Third" + e.toString());
          float interest = myLoanRemote.calculateInterest(rate, time, amount);
          out.println("<B> Interest : " + interest + " </B>");
I get an internal error that points to the line with **** (that is line 40)
help pls

Answer 1

tried it but got this error
java.lang.NullPointerException
     at LoanServlet.doGet(LoanServlet.java:40)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:748)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:861)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:289)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:500)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:311)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:205)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:283)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:102)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:192)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:263)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:156)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:569)
     at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:261)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:215)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:156)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:569)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:200)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:156)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:180)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:154)
     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:582)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:154)
     at com.sun.enterprise.webservice.EjbWebServiceValve.invoke(EjbWebServiceValve.java:134)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:154)
     at com.sun.enterprise.security.web.SingleSignOn.invoke(SingleSignOn.java:254)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:154)
     at com.sun.enterprise.web.VirtualServerValve.invoke(VirtualServerValve.java:209)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:154)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:569)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:161)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:156)
     at com.sun.enterprise.web.VirtualServerMappingValve.invoke(VirtualServerMappingValve.java:166)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:154)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:569)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:979)
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:211)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:692)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:647)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:589)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:691)
     at java.lang.Thread.run(Thread.java:534)
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