when i try to run an ejb application the following error occurs!!!
Can u help me out of it
The following stack trace is displayed
java.lang.NoClassDefFoundError: javax/ejb/EJBHome
at java.lang.ClassLoader.findBootstrapClass(Native Method)
at java.lang.ClassLoader.findBootstrapClass0(ClassLoader.java:727)
at java.lang.ClassLoader.loadClass(ClassLoader.java:284)
at java.lang.ClassLoader.loadClass(ClassLoader.java:282)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:219)
at
sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:707)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:622)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:517)
at
java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:639)
at
java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:309)
at
sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:241)
at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1469)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1432)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
at java.rmi.MarshalledObject.get(MarshalledObject.java:135)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:353)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:333)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
at An.displaySearchResult(An.java:93)
at An.displayPage(An.java:64)
at An.doPost(An.java:26)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at filters.ExampleFilter.doFilter(ExampleFilter.java:149)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:534)
The code listing is here
For Remote interface
package tassie;
import javax.ejb.EJBObject;
import java.rmi.RemoteException;
import java.util.ArrayList;
public interface Search extends EJBObject {
public ArrayList search(String keyword) throws RemoteException;
}
for home interface
package tassie;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBHome;
public interface SearchHome extends EJBHome {
Search create() throws RemoteException, CreateException;
}
For bean class
package tassie;
import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import java.sql.*;
import java.util.ArrayList;
public class SearchBean implements SessionBean {
private Connection getConnection() {
Connection connection = null;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
connection = DriverManager.getConnection("jdbc:odbc:TassieDB");
}
catch (Exception e) {
}
return connection;
}
public ArrayList search(String keyword) {
ArrayList retval = new ArrayList(50);
try {
Statement statement = getConnection().createStatement();
String sql = "SELECT Id, Title, Author, Publisher" +
" FROM Books" +
" WHERE Title LIKE '%" + keyword + "%'";
ResultSet rs = statement.executeQuery(sql);
while (rs.next()) {
String[] row = new String[4];
row[0] = rs.getString("Id");
row[1] = rs.getString("Title");
row[2] = rs.getString("Author");
row[3] = rs.getString("Publisher");
retval.add(row);
}
rs.close();
statement.close();
}
catch (Exception e) {
}
return retval;
}
public void ejbCreate() {
}
public void ejbRemove() {
}
public void ejbActivate() {
}
public void ejbPassivate() {
}
public void setSessionContext(SessionContext sc) {
}
}
n the client servlet is here
//package com.brainysoftware.tassie.servlet;
import javax.servlet.*;
import javax.ejb.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
import tassie.Search;
import tassie.SearchHome;
public class An extends HttpServlet {
private String keyword;
/**Process the HTTP Get request*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
displayPage(request, response);
}
/**Process the HTTP Post request*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
keyword = request.getParameter("keyword");
displayPage(request, response);
}
private void displayPage(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
/* In addition to the header and footer,
There are 4parts in this page:
1. The Welcome Title
2. Search form
3. The search result table
4. The link to the Check Shopping Cart page
*/
response.setContentType("text/html");
PrintWriter out = response.getWriter();
// header
out.println("");
out.println("");
out.println("Welcome to Tassie Online Bookstore");
out.println("");
out.println("");
out.println("");
// Welcome Title
out.println("<H2>Welcome To Tassie Online Bookstore</H2>");
// Search form
out.println("");
out.println("<FORM METHOD=POST>");
out.println("Title: <INPUT TYPE=TEXT NAME=keyword>");
out.println("<INPUT TYPE=SUBMIT VALUE=Search");
out.println("");
out.println("");
// Search result
out.println("");
out.println("<H3>Search Result</H3>");
out.println("");
displaySearchResult(out);
out.println("");
// Link to the Check Shopping Cart link
out.println("");
out.println("<A HREF=Hello>Check Shopping Cart");
// footer
out.println("");
out.println("");
out.println("");
// Displaying the Search form
}
/**Clean up resources*/
private void displaySearchResult(PrintWriter out) {
if (keyword!=null && !keyword.trim().equals("")) {
// keyword okay, display the result here.
Properties properties = new Properties();
properties.put(Context.INITIAL_CONTEXT_FACTORY,
"org.jnp.interfaces.NamingContextFactory");
properties.put(Context.PROVIDER_URL, "localhost:1099");
try {
// Get a naming context
InitialContext jndiContext = new InitialContext(properties);
System.out.println("got context");
// Get a reference to the Bean
Object ref = jndiContext.lookup("Search");
System.out.println("got reference");
// Get a reference from this to the Bean's Home interface
SearchHome home = (SearchHome)
PortableRemoteObject.narrow (ref, SearchHome.class);
// Create an Adder object from the Home interface
Search searchBean = home.create();
ArrayList arrayList = searchBean.search(keyword);
int rowCount = arrayList.size();
out.println("<TABLE BORDER=1>");
out.println("");
out.println("<TH WIDTH=350>Title");
out.println("<TH WIDTH=150>Author");
out.println("<TH WIDTH=150>Publisher");
out.println("<TH WIDTH=50> ");
out.println("");
for (int i=0; i<rowCount; i++) {
String[] s = (String[]) arrayList.get(i);
out.println("");
out.println("" + s[1] + "");
out.println("" + s[2] + "");
out.println("" + s[3] + "");
out.println("<A
HREF=com.brainysoftware.tassie.servlet.BookDetailsServlet?bookId=" +
s[0] + ">Details");
out.println("");
}
out.println("");
}
catch(Exception e) {
System.out.println(e.toString());
}
}
}
}
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