Mam taki kod
import java.util.Properties;
import javax.naming.InitialContext;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import st.HelloRemote;
public class HelloClient extends JFrame {
public HelloClient() {
super("Hello Client");
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
JButton b1 = new JButton("Access EJB");
getContentPane().add(b1, BorderLayout.PAGE_END);
b1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
String msg = "";
try {
// Access JNDI Initial Context.
Properties p = new Properties();
p.put("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
p.put("java.naming.provider.url","jnp://localhost:1099");
p.put("java.naming.factory.url.pkgs","org.jboss.naming:org.jnp.interfaces");
InitialContext ctx = new InitialContext(p);
// Change jndi name according to your server and ejb
HelloRemote remote = (HelloRemote) ctx.lookup("HelloBean/remote");
msg = "Message From EJB --> " + remote.sayHello();
}
catch(Exception ex){
msg = "Error --> " + ex.getCause().toString(); // że niby w tym miejscu jest lipa
}
JOptionPane.showMessageDialog(HelloClient.this,msg,"Message", JOptionPane.INFORMATION_MESSAGE);
}
});
setSize(200,200);
} //
public static void main(String args[]) {
new HelloClient().setVisible(true);
}
}
i dostaje takie błędy co może być przyczyną
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at HelloClient$1.actionPerformed(HelloClient.java:32)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6267)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6032)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)