jsf exception

I'm getting this error trying to
bind a method to the action property of my component:

exception

javax.servlet.ServletException: #{customer.addNewUser}: javax.faces.el.MethodNotFoundException: addNewUser: com.corejsf.CustomerBean.addNewUser()
javax.faces.webapp.FacesServlet.service(FacesServlet.java:209)

root cause

javax.faces.FacesException: #{customer.addNewUser}: javax.faces.el.MethodNotFoundException: addNewUser: com.corejsf.CustomerBean.addNewUser()
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
javax.faces.component.UICommand.broadcast(UICommand.java:312)
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:267)
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:381)
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:75)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)

note The full stack trace of the root cause is available in the Tomcat logs.

and thsi is my component

<h:commandButton value="NewUser" action="#{customer.addNewUser}" />

so where is my error

Let us see how you defined the addNewUser method in com.corejsf.CustomerBean.

It should be a public no-argument method returning a java.lang.String. If it isn't the method signature won't match what the JSF framework is expecting.

here's my method
i'm still facing the same exception
public String addNewUser() throws SQLException, NamingException {
try {
open();

Statement stmt = conn.createStatement();
ResultSet result = stmt.executeQuery("SELECT * FROM USERS ");
//Name name=new Name("essam","ahmed");

return "AddSuccess";
} finally {
close();
}

}

Hmmmm. I'm not sure it's OK to list thrown exceptions. It seems unlikely, since the JSF framework isn't written to expect them. I think you're going to have to wrap your exceptions and rethrow them as JSF exceptions. JSF exceptions are unchecked exceptions, so you don't declare them in the method declaration.

i removed all exeptions handling even i removed any code line form the method body amd i'm still stuck what should i do again

appreciate your help

you can throw checked exceptions. It shouldn't matter. The problem is somewhere in your class declaration. How did you declare your managed bean and in which package is it?

here's my all bean

package com.corejsf;
import java.sql.Connection;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
import java.util.List;
 
import javax.naming.Context;
 import javax.naming.InitialContext;
import javax.naming.NamingException;
 import javax.servlet.jsp.jstl.sql.Result;
 import javax.servlet.jsp.jstl.sql.ResultSupport;
import javax.sql.DataSource;
 
import com.fdsapi.ResultSetUtils;
 
 public class CustomerBean {
 private Connection conn;
 private boolean editable;

public void open() throws SQLException, NamingException {
 if (conn != null) return;
 
 MyConn myconn=new MyConn();
 conn = myconn.getConn();
 }
 
 
 }
 
 public String addNewUser() throws SQLException, NamingException {
 try {
 open();
 
 Statement stmt = conn.createStatement();
 ResultSet result = stmt.executeQuery("SELECT * FROM USERS ");
 //Name name=new Name("essam","ahmed");
 
  return "AddSuccess";
} finally {
 close();
 }

}

public void close() throws SQLException {
 if (conn == null) return;
 conn.close();
 conn = null;
}
 
public boolean isEditable() {
return editable;
}
 
public void setEditable(boolean editable) {
this.editable = editable;
}

}

thank you very much

your class and the method look ok... the only thing left then is, check your classpath. looks like there is some other CustomerBean in your classpath and this one does not have addNewUser() method. Also check if you have the latest class in your tomcat webapps.

Everything looks okay except the throws part in your action method. Did you try removing it?
For exceptions in the action and actionListener methods, what I normally do is catch them, log them, add an appropriate FacesMessage to FacesContext so the users know about it and finally return ""(for action methods) or return(for actionListener methods).
Hope this helps.