Problem in Tomcat Servlet calling JBoss EJB running on a dif

[gsorce]

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("");
out.println(title);
out.println("<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.

IMPORTANT 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("");
out.close();
}
}


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[mschoning]

I am running tomcat 4.04 calling an EJB on JBOSS 3.0.4.

I am using jboss-all.jar instead of jboss.jar I don't know if that makes a difference here (I need it for webservices).

This code works for me:

Hashtable props = new Hashtable();
props.put(InitialContext.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
props.put(InitialContext.PROVIDER_URL, "jnp://server3:1099");
InitialContext ic = new InitialContext(props);

TestEjbHome home = (TestEjbHome) PortableRemoteObject.narrow(ic.lookup(TestEjbHome.JNDI_NAME),TestEjbHome.class);
TestEjb myBean = home.create();