Executing java program in oracle

Good day everyone!
I created a small java program.
import javax.swing.JOptionPane;
public class LogOn {
public static void main (String [] args) {}
public static void ShowMessage(){
JOptionPane.showConfirmDialog(null, "Hello", "Info", JOptionPane.PLAIN_MESSAGE);
I compiled the code using javac and loaded into oracle using "loadjava -u scott/tiger Logon
Then I created a procedure,
create or replace procedure l_b
as language java
name 'LogOn.showMessage()';
then I executed the procedure
SQL> execute l_b;
it's just say
ERROR at line 1:
ORA-03113: end-of-file on communication channel
Any idea why its doing that?
Thanks for the time
Edited by: Xtro on Oct 30, 2008 9:38 AM

What is the "warning banner" attempting to communicate? And where did this requirement come from-- presumably users are not seeing a banner when they log in today.
Realistically, you are not going to be able to cause arbitrary client applications to display something, you are going to have to configure each client application separately, which seems like a huge investment of time for very marginal benefits assuming that government agencies have a decent number of client machines and a decent variety of client applications. The glogin.sql file will work for SQL*Plus (assuming very recent versions or that no one uses the "connect" command to connect to a different database), but I believe you are looking for something that works across client applications, which probably doesn't exist.
Justin

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Forms [32 Bit] Version 11.1.1.3.0 (Production)
Jdeveloper - 10.1.3
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import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
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e.printStackTrace();
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-- DO NOT EDIT THIS FILE - it is machine generated!
args   JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN (JNI.NEW_OBJECT('demo/get_info', '()V', args));
END;
-- Method: main ([Ljava/lang/String;)V
PROCEDURE main(
    a0    ORA_JAVA.JARRAY) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
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END;
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PROCEDURE ch_add IS
BEGIN
    args := NULL;
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END;
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PROCEDURE wait(
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BEGIN
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Now i want to call the o/p of Java programe in oracle text item. Please help me. It's very urgent. I am not good in Java.

Sir i use java importer.
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BEGIN
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Basicaly i don't know how to call java program in form builder.
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DECLARE
jo ora_java.jobject;
rv varchar2(1500);
ex ora_java.jobject;
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jo := get_info.new;
rv:=get_info.ch_add(jo );
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