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Posted to users@tomcat.apache.org by Giuseppe Sorce <so...@eng.it> on 2002/11/11 14:53:26 UTC
Problem in Tomcat Servlet calling JBoss EJB running on a different machine
Scenario:
***** Client Development Machine
Win2K prof.
NetBeans IDE 3.4
Tomcat 4.0 (integrated in NetBeans)
JDK 1.3.1
***** Server EJB Container
Linux RedHat 7.1
JDK 1.3.1
jboss-3.0.3_tomcat-4.1.12
***** Test Application
Very simple, look at http://www.adwanted.com/jboss/ for details
- Only 1 Stateless Session Bean (com.web_tomorrow.interest.InterestBean),
implementing just a simple method:
public double calculateCompoundInterest(double principle,
double rate, double periods) {
System.out.println ("Someone called `calculateCompoundInterest!'");
return principle * Math.pow(1+rate, periods) - principle;
}
- Compiled and deployed using NetBeans (very useful the JAR Recipe!). Copied
the jar file on the Linux server. All works fine!
- Tested with a simple Java Client:
System.setProperty("java.naming.factory.initial",
"org.jnp.interfaces.NamingContextFactory");
System.setProperty("java.naming.provider.url", "ewlpasrv1");
InitialContext jndiContext = new InitialContext();
Object ref = jndiContext.lookup("examples/Interest");
InterestHome home = (InterestHome)
PortableRemoteObject.narrow (ref, InterestHome.class);
Interest interest = home.create();
System.out.println
("Interest on 1000 units, at 10% per period, compounded over 2 periods
is:");
System.out.println (interest.calculateCompoundInterest (1000, 0.10, 2));
No error reported.
***** PROBLEM
We made a simple Servlet (look at the bottom of this document...), similar
to the client.
- we created a Web Module using netbeans
- we copied jboss client jar files under (...)\tomcat404\lib
- we copied the app's deployment jar file under (...)\WEB-INF\lib
Running the servlet from NetBeans IDE (using internal Tomcat), here is the
result:
Servlet interface to EJB
Calling EJB...
Got context
Got reference
Got Home Interface
java.rmi.UnmarshalException: Error unmarshaling return; nested exception is:
java.net.SocketException: Connection aborted by peer: JVM_recv in socket
input stream read
(the full error stack is listed at the end of this mail).
Any idea?
Thanx in advance
Giuseppe Sorce
ITALY
----------------- Error -------------------------
Apache Tomcat/4.0.4 - HTTP Status 500 - Internal Server Error
type Exception report
message Internal Server Error
description The server encountered an internal error (Internal Server Error)
that prevented it from fulfilling this request.
exception
java.rmi.UnmarshalException: Error unmarshaling return; nested exception is:
java.net.SocketException: Connection reset by peer: JVM_recv in socket
input stream read
java.net.SocketException: Connection reset by peer: JVM_recv in socket
input stream read
at java.net.SocketInputStream.socketRead(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:86)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:186)
at java.io.BufferedInputStream.read(BufferedInputStream.java:204)
at java.io.ObjectInputStream.peekCode(ObjectInputStream.java:1550)
at
java.io.ObjectInputStream.skipToEndOfBlockData(ObjectInputStream.java:1480)
at
java.io.ObjectInputStream.inputClassDescriptor(ObjectInputStream.java:927)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:366)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1186)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2263)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1412)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2263)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1412)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)
at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:212)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)
at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
at
org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProx
y.java:129)
at
org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:108)
at
org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:77
)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:80)
at org.jboss.proxy.ejb.HomeInterceptor.invoke(HomeInterceptor.java:198)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:76)
at $Proxy0.create(Unknown Source)
at org.apache.jsp.index$jsp._jspService(index$jsp.java:87)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper
.service(IDEJspServlet.java:173)
at
org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.serviceJspFile(ID
EJspServlet.java:246)
at
org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.service(IDEJspSer
vlet.java:339)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:243)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:190)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180
)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.
java:170)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170
)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:174)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:
1027)
at
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125
)
at java.lang.Thread.run(Thread.java:484)
----------------- ejb Servlet --------------------
/**
* This Servlet provides a user interface to an Enterprise Java Bean.
* The example EJB described in the jBoss documentation at
* <http://jboss.org/> calculates compound interest. This servlet
* is based on Hello.java, distributed with Apache JServ.
* This servlet will call the Interest EJB, passing it a few
* parameters. The EJB will return a result, which the servlet
* will display to the Web client.
*/
import java.io.*;
// Servlet stuff
import javax.servlet.*;
import javax.servlet.http.*;
// EJB stuff
import javax.naming.*;
import java.util.Hashtable;
import javax.rmi.PortableRemoteObject;
import com.web_tomorrow.interest.*;
/public class ejb extends HttpServlet {
/**
* Handle the GET and HEAD methods by building a simple web page.
* HEAD is just like GET, except that the server returns only the
* headers (including content length) not the body we write.
*/
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out;
String title = "Servlet interface to EJB";
// set content type and other response header fields first
response.setContentType("text/html");
// then write the data of the response
out = response.getWriter();
out.println("<HTML><HEAD><TITLE>");
out.println(title);
out.println("</TITLE></HEAD><BODY bgcolor=\"#FFFFFF\">");
out.println("<H1>" + title + "</H1>");
out.println("<H2>Calling EJB...</H2>");
/**
This simple servlet tests the `Interest' Enterprise JavaBean which is
implemented in the package `com.web_tomorrow.interest'. For this to
work, the Bean must be deployed on an EJB server.
<P>
<B>IMPORTANT</B> If you want to test this in a real client-server
configuration, this class goes on the client; the URL of the naming
provider specifed in the class must be changed from `localhost:1099'
to the URL of the naming service on the server
*/
// Set up the naming provider; this may not always be necessary,
depending
// on how your Java system is configured.
System.setProperty("java.naming.factory.initial",
"org.jnp.interfaces.NamingContextFactory");
System.setProperty("java.naming.provider.url",
"ewlpasrv1");
// Enclosing the whole process in a single `try' block is not an ideal
way
// to do exception handling, but I don't want to clutter the program up
// with catch blocks
try {
// Get a naming context
InitialContext jndiContext = new InitialContext();
out.println("Got context");
// Get a reference to the Interest Bean
Object ref = jndiContext.lookup("examples/Interest");
out.println("Got reference");
// Get a reference from this to the Bean's Home interface
InterestHome home = (InterestHome)
PortableRemoteObject.narrow (ref, InterestHome.class);
out.println("Got Home Interface");
// Create an Interest object from the Home interface
Interest interest = home.create();
out.println("Got Interest Object from the Home interface");
// call the calculateCompoundInterest() method to do the calculation
out.println ("Interest on 1000 units, at 10% per period, " +
"compounded over 2 periods is:");
out.println (interest.calculateCompoundInterest (1000, 0.10, 2));
} catch(Exception e) {
out.println(e.toString());
}
out.println("</BODY></HTML>");
out.close();
}
}
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Re: Problem in Tomcat Servlet calling JBoss EJB running on a different machine
Posted by Giuseppe Sorce <so...@eng.it>.
Thanks Anthony,
I tried to use "-nonaming" swhitch, but, it seems that tomcat don't
recognize this argument. Details:
- Apache Tomcat/4.1.12 running on a Win2K Server box
- From the command line:
D:\jakarta-tomcat-4.1.12\bin> startup.bat -nonaming
Then another DOS window appears and then quickly disappears ... tomcat isn't
running.
Any idea?
Thanx in advance
Giuseppe Sorce
ITALY
----- Original Message -----
From: "Anthony Geoghegan" <an...@eircom.net>
To: "Tomcat Users List" <to...@jakarta.apache.org>
Sent: Monday, November 11, 2002 3:16 PM
Subject: Re: Problem in Tomcat Servlet calling JBoss EJB running on a
different machine
> Tomcat -nonaming switch used?
> The Tomcat JNDI server conflicts with JBOSS's
> you have to switch it off from the command line.
>
> Best Regards,
> Anthony Geoghegan.
> J2EE Developer
> CPS Ireland Ltd.
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Re: Problem in Tomcat Servlet calling JBoss EJB running on a different machine
Posted by Anthony Geoghegan <an...@eircom.net>.
Tomcat -nonaming switch used?
The Tomcat JNDI server conflicts with JBOSS's
you have to switch it off from the command line.
Best Regards,
Anthony Geoghegan.
J2EE Developer
CPS Ireland Ltd.
----- Original Message -----
From: "Giuseppe Sorce" <so...@eng.it>
To: "Tomcat Users List" <to...@jakarta.apache.org>
Sent: Monday, November 11, 2002 1:53 PM
Subject: Problem in Tomcat Servlet calling JBoss EJB running on a different
machine
> Scenario:
>
> ***** Client Development Machine
> Win2K prof.
> NetBeans IDE 3.4
> Tomcat 4.0 (integrated in NetBeans)
> JDK 1.3.1
>
> ***** Server EJB Container
> Linux RedHat 7.1
> JDK 1.3.1
> jboss-3.0.3_tomcat-4.1.12
>
> ***** Test Application
> Very simple, look at http://www.adwanted.com/jboss/ for details
>
> - Only 1 Stateless Session Bean (com.web_tomorrow.interest.InterestBean),
> implementing just a simple method:
>
> public double calculateCompoundInterest(double principle,
> double rate, double periods) {
> System.out.println ("Someone called `calculateCompoundInterest!'");
> return principle * Math.pow(1+rate, periods) - principle;
> }
>
> - Compiled and deployed using NetBeans (very useful the JAR Recipe!).
Copied
> the jar file on the Linux server. All works fine!
>
> - Tested with a simple Java Client:
>
> System.setProperty("java.naming.factory.initial",
> "org.jnp.interfaces.NamingContextFactory");
> System.setProperty("java.naming.provider.url", "ewlpasrv1");
> InitialContext jndiContext = new InitialContext();
> Object ref = jndiContext.lookup("examples/Interest");
> InterestHome home = (InterestHome)
> PortableRemoteObject.narrow (ref, InterestHome.class);
> Interest interest = home.create();
> System.out.println
> ("Interest on 1000 units, at 10% per period, compounded over 2 periods
> is:");
> System.out.println (interest.calculateCompoundInterest (1000, 0.10, 2));
>
> No error reported.
>
> ***** PROBLEM
>
> We made a simple Servlet (look at the bottom of this document...), similar
> to the client.
> - we created a Web Module using netbeans
> - we copied jboss client jar files under (...)\tomcat404\lib
> - we copied the app's deployment jar file under (...)\WEB-INF\lib
> Running the servlet from NetBeans IDE (using internal Tomcat), here is the
> result:
>
> Servlet interface to EJB
> Calling EJB...
> Got context
> Got reference
> Got Home Interface
> java.rmi.UnmarshalException: Error unmarshaling return; nested exception
is:
> java.net.SocketException: Connection aborted by peer: JVM_recv in socket
> input stream read
> (the full error stack is listed at the end of this mail).
>
>
> Any idea?
> Thanx in advance
> Giuseppe Sorce
> ITALY
>
> ----------------- Error -------------------------
> Apache Tomcat/4.0.4 - HTTP Status 500 - Internal Server Error
> type Exception report
> message Internal Server Error
> description The server encountered an internal error (Internal Server
Error)
> that prevented it from fulfilling this request.
> exception
> java.rmi.UnmarshalException: Error unmarshaling return; nested exception
is:
> java.net.SocketException: Connection reset by peer: JVM_recv in socket
> input stream read
> java.net.SocketException: Connection reset by peer: JVM_recv in socket
> input stream read
> at java.net.SocketInputStream.socketRead(Native Method)
> at java.net.SocketInputStream.read(SocketInputStream.java:86)
> at java.io.BufferedInputStream.fill(BufferedInputStream.java:186)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:204)
> at java.io.ObjectInputStream.peekCode(ObjectInputStream.java:1550)
> at
>
java.io.ObjectInputStream.skipToEndOfBlockData(ObjectInputStream.java:1480)
> at
> java.io.ObjectInputStream.inputClassDescriptor(ObjectInputStream.java:927)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:366)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)
> at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1186)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
> at
java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2263)
> at
java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)
> at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1412)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
> at
java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2263)
> at
java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)
> at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1412)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)
> at
> sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:212)
> at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)
> at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown
Source)
> at
>
org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProx
> y.java:129)
> at
>
org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:108)
> at
>
org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:77
> )
> at
org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:80)
> at org.jboss.proxy.ejb.HomeInterceptor.invoke(HomeInterceptor.java:198)
> at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:76)
> at $Proxy0.create(Unknown Source)
> at org.apache.jsp.index$jsp._jspService(index$jsp.java:87)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
>
org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper
> .service(IDEJspServlet.java:173)
> at
>
org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.serviceJspFile(ID
> EJspServlet.java:246)
> at
>
org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.service(IDEJspSer
> vlet.java:339)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
>
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
> FilterChain.java:247)
> at
>
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
> ain.java:193)
> at
>
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
> va:243)
> at
>
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
> 66)
> at
>
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
> at
>
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
> va:190)
> at
>
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
> 66)
> at
>
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
> at
> org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
> at
>
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180
> )
> at
>
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
> 66)
> at
>
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.
> java:170)
> at
>
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
> 64)
> at
>
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170
> )
> at
>
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
> 64)
> at
> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
> at
>
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
> 64)
> at
>
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
> at
>
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
> :174)
> at
>
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
> 66)
> at
>
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
> at
>
org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:
> 1027)
> at
>
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125
> )
> at java.lang.Thread.run(Thread.java:484)
>
>
> ----------------- ejb Servlet --------------------
> /**
> * This Servlet provides a user interface to an Enterprise Java Bean.
> * The example EJB described in the jBoss documentation at
> * <http://jboss.org/> calculates compound interest. This servlet
> * is based on Hello.java, distributed with Apache JServ.
> * This servlet will call the Interest EJB, passing it a few
> * parameters. The EJB will return a result, which the servlet
> * will display to the Web client.
> */
> import java.io.*;
>
> // Servlet stuff
> import javax.servlet.*;
> import javax.servlet.http.*;
>
> // EJB stuff
> import javax.naming.*;
> import java.util.Hashtable;
> import javax.rmi.PortableRemoteObject;
> import com.web_tomorrow.interest.*;
>
>
> /public class ejb extends HttpServlet {
> /**
> * Handle the GET and HEAD methods by building a simple web page.
> * HEAD is just like GET, except that the server returns only the
> * headers (including content length) not the body we write.
> */
> public void doGet (HttpServletRequest request,
> HttpServletResponse response)
> throws ServletException, IOException {
>
> PrintWriter out;
> String title = "Servlet interface to EJB";
>
> // set content type and other response header fields first
> response.setContentType("text/html");
>
> // then write the data of the response
> out = response.getWriter();
>
> out.println("<HTML><HEAD><TITLE>");
> out.println(title);
> out.println("</TITLE></HEAD><BODY bgcolor=\"#FFFFFF\">");
> out.println("<H1>" + title + "</H1>");
> out.println("<H2>Calling EJB...</H2>");
>
> /**
> This simple servlet tests the `Interest' Enterprise JavaBean which is
> implemented in the package `com.web_tomorrow.interest'. For this to
> work, the Bean must be deployed on an EJB server.
> <P>
> <B>IMPORTANT</B> If you want to test this in a real client-server
> configuration, this class goes on the client; the URL of the naming
> provider specifed in the class must be changed from `localhost:1099'
> to the URL of the naming service on the server
> */
>
> // Set up the naming provider; this may not always be necessary,
> depending
> // on how your Java system is configured.
> System.setProperty("java.naming.factory.initial",
> "org.jnp.interfaces.NamingContextFactory");
> System.setProperty("java.naming.provider.url",
> "ewlpasrv1");
>
> // Enclosing the whole process in a single `try' block is not an ideal
> way
> // to do exception handling, but I don't want to clutter the program
up
> // with catch blocks
> try {
> // Get a naming context
> InitialContext jndiContext = new InitialContext();
> out.println("Got context");
>
> // Get a reference to the Interest Bean
> Object ref = jndiContext.lookup("examples/Interest");
> out.println("Got reference");
>
> // Get a reference from this to the Bean's Home interface
> InterestHome home = (InterestHome)
> PortableRemoteObject.narrow (ref, InterestHome.class);
> out.println("Got Home Interface");
>
> // Create an Interest object from the Home interface
> Interest interest = home.create();
> out.println("Got Interest Object from the Home interface");
>
> // call the calculateCompoundInterest() method to do the calculation
> out.println ("Interest on 1000 units, at 10% per period, " +
> "compounded over 2 periods is:");
> out.println (interest.calculateCompoundInterest (1000, 0.10, 2));
> } catch(Exception e) {
> out.println(e.toString());
> }
>
> out.println("</BODY></HTML>");
> out.close();
> }
> }
>
>
> --
> To unsubscribe, e-mail:
<ma...@jakarta.apache.org>
> For additional commands, e-mail:
<ma...@jakarta.apache.org>
>
>
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