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: <mailto:tomcat-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:tomcat-user-help@;jakarta.apache.org>
