Error with a javabean area.....

Question

Hello everybody, i implement a bean that i developed on jdev in my form, i got this error in the Jinitiator console:
java.lang.ClassNotFoundException: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at sun.plugin.security.PluginClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClassInternal(Unknown Source)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Unknown Source)
     at oracle.forms.handler.UICommon.instantiate(Unknown Source)
     at oracle.forms.handler.UICommon.onCreate(Unknown Source)
     at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
     at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
     at oracle.forms.engine.Runform.processMessage(Unknown Source)
     at oracle.forms.engine.Runform.processSet(Unknown Source)
     at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
     at oracle.forms.engine.Runform.onMessage(Unknown Source)
     at oracle.forms.engine.Runform.sendInitialMessage(Unknown Source)
     at oracle.forms.engine.Runform.startRunform(Unknown Source)
     at oracle.forms.engine.Main.createRunform(Unknown Source)
     at oracle.forms.engine.Main.start(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
does anyone knows what it is?
the bean isn't finish totally, but even so i try to test it and get this, does anyone knows what it is?

Answer 1

hello again, this is the code that i worte, it is a serial port reader:
package mybeans;
//this is for serialbean workspace and project
import oracle.forms.ui.VBean;
import java.io.*;
import javax.comm.*;
import java.util.*;
import oracle.forms.handler.IHandler;
public class SerialLogger extends VBean implements SerialPortEventListener
BufferedReader ifile;
public SerialLogger() throws IOException, NoSuchPortException, PortInUseException,
UnsupportedCommOperationException
// get list of ports available on this particular computer,
// by calling static method in CommPortIdentifier.
Enumeration pList = CommPortIdentifier.getPortIdentifiers();
// Process the list, putting serial and parallel into ComboBoxes
while (pList.hasMoreElements())
CommPortIdentifier cpi = (CommPortIdentifier)pList.nextElement();
String name = cpi.getName();
System.out.print("Port " + name + " ");
if (cpi.getPortType() == CommPortIdentifier.PORT_SERIAL)
System.out.println("is a Serial Port: " + cpi);//\u0D0A330 CHAPTER 11: PROGRAMMING SERIAL AND PARALLEL PORTS
SerialPort thePort;
try
thePort = (SerialPort)cpi.open("Logger", 1000);
catch (PortInUseException ev)
System.err.println("Port in use: " + name);
continue;
// Tell the Comm API that we want serial events.
thePort.notifyOnDataAvailable(true);
try
thePort.addEventListener(this);
ifile = new BufferedReader(
new InputStreamReader(thePort.getInputStream()));
catch (TooManyListenersException ev)
// "CantHappen" error
System.err.println("Too many listeners(!) " + ev);
System.exit(0);
public void serialEvent(SerialPortEvent ev) {
String line;
String line2;
try {
line = ifile.readLine();
line2=ifile.readLine();
if (line == null) {
System.out.println("EOF on serial port.");
System.exit(0);
System.out.println(": " + line);
System.out.println(": " + line2);
} catch (IOException ex) {
System.err.println("IO Error " + ex);
NB: when i extended my class from Vtextfield i didn't get any error, but when i extended from vbean i get that, what i'm trying to do is when i get a serial event a when-custom-item-event trigger on the bean area is launched....