Applet Stuck

Question

... I am developing a client/server arch that connects to the database using jdbc.
... My application connects to the oracle database using jdbc....And the applet connects to the application using sockets........
When the applet is loaded to the intranet, i don't get the full applet loaded properly.I mean in my applet , i have an insert and a query button , howevever , my insert button is missing.I only have the query button there.When i click the query button, the applet gets stuck.
My application code is
import java.sql.*;
import java.util.Properties;
import java.io.*;
import java.net.*;
public class CommentsServer extends Thread {
public static final int DEFAULT_PORT = 7777;
protected int port;
protected ServerSocket server;
String username ="combtest";
String password = "combtest";
public static void main (String args[]) {
int port=0;
if (args.length == 1) {
try {
port = Integer.parseInt (args[0]);
} catch (NumberFormatException e) { }
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
String sourceURL ="jdbc:oracle:thin:@klmsph1:1521:KLM";
String user="combtest";
String password="combtest";
catch (Exception e) {
System.err.println("Failed to load JDBC driver.");
System.exit (1);
new CommentsServer (port);
public CommentsServer (int port) {
super ("Comments Server");
if (port == 0)
port = DEFAULT_PORT;
this.port = port;
try {
server = new ServerSocket (port);
} catch (IOException e) {
System.err.println ("Error creating server");
System.exit (1);
start();
public void run() {
System.out.println ("Server Running");
ThreadGroup connections = new ThreadGroup ("Comment Connections");
connections.setMaxPriority(this.getPriority()-1);
try {
while (true) {
Socket client = server.accept();
System.out.println ("Connection from: " + client.getInetAddress().getHostName());
CommentsConnection c = new CommentsConnection (connections, client);
} catch (IOException e) {
System.err.println ("Exception listening");
System.exit (1);
System.exit (0);
class CommentsConnection extends Thread {
static int counter = 0;
protected ObjectInputStream in;
protected PrintWriter out;
public CommentsConnection (ThreadGroup group, Socket client) {
super (group, "Connection " + counter++);
try {
in = new ObjectInputStream (client.getInputStream ());
out = new PrintWriter (client.getOutputStream(), true);
} catch (IOException e) {
try {
client.close();
} catch (IOException e2) { }
System.err.println ("Unable to connect.");
return;
start();
public void run () {
try {
String mode = (String)in.readObject();
if (mode.equals("insert")) {
String name=(String)in.readObject();
try {
String u="jdbc:oracle:thin:@klmsph1:1521:KLM";
Connection con=DriverManager.getConnection(u,"combtest","combtest");
PreparedStatement prep=con.prepareStatement("Insert into TEST values(?)");
prep.setString(1,name);
if(prep.executeUpdate()!=1)
throw new Exception("Bad update");
} catch (Exception e) {
out.println ("Error updating: " + e);
return;
} else if (mode.equals("query")) {
try {
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@klmsph1:1521:KLM","combtest","combtest");
Statement statement=con.createStatement();
ResultSet result=statement.executeQuery("SELECT * FROM TEST");
out.println("Name");
int nameCol=result.findColumn("NAME");
String name,user,comments;
while(result.next())
name=result.getString(nameCol);
out.println(name);
statement.close();
con.close();
} catch (Exception e) {
out.println ("Error querying: " + e);
return;
} else {
out.println ("Invalid Command: " + mode);
} catch (Exception e) {
out.println ("Error reading Stream: " + e);
out.close();
My applet code is:
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.io.*;
import java.net.*;
/*<applet
code=j
width = 400
height = 400
>
</applet>
public class j extends Applet{
TextArea ta;
TextField name;
Panel p1,p2;
Button q,i;
Panel p3;
public void init(){
p1=new Panel(new BorderLayout());
q=new Button("Query");
p1.add(q,"South");
ta=new TextArea();
ta.setEditable(false);
p1.add(ta,"Center");
add(p1);
p2=new Panel(new BorderLayout());
i=new Button("Insert");
p2.add(i,"South");
p3=new Panel();
name=new TextField(" ",10);
p3.add(name);
p2.add(p3,"Center");
add(p2);
public void run_S(){
ByteArrayOutputStream bao=new ByteArrayOutputStream();
com cc=new com("sentri.com",0,bao,name.getText());
ta.setText(bao.toString());
public boolean action(Event e,Object o){
if(e.target==i){
run_S();
return true;
else if(e.target==q){
run_q();
return true;
else return false;
public void run_q(){
ByteArrayOutputStream bao=new ByteArrayOutputStream();
com cc=new com("sentri.com",0,bao);
ta.setText(bao.toString());
class com{
int PORT=7777;
private static final String query="query";
private static final String insert="insert";
private String host=null;
private OutputStream os=null;
public String n="null";
private int port=0;
com(String host,int port,OutputStream os,String name){
this.host=host;
this.port=((port==0)?PORT:port);
this.os=os;
insert(name);
run(name);
com(String host,int port,OutputStream os){
this.host=host;
this.port=((port==0)?PORT:port);
this.os=os;
query();
private void query () {
PrintWriter out = new PrintWriter (os, true);
try {
Socket s = new Socket (host, PORT);
ObjectOutputStream oos = new ObjectOutputStream (s.getOutputStream());
oos.writeObject (query);
oos.flush();
BufferedReader in = new BufferedReader (new InputStreamReader (s.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
out.println (line);
out.close();
s.close();
} catch (IOException e) {
out.println ("Error querying." + e);
return;
public void run(String name){
n=name;
private void insert (String name) {
PrintWriter out = new PrintWriter (os, true);
try {
Socket s = new Socket (host, PORT);
ObjectOutputStream oos = new ObjectOutputStream (s.getOutputStream());
oos.writeObject (insert);
oos.writeObject (name);
oos.flush();
BufferedReader in = new BufferedReader (new InputStreamReader (s.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
out.println (line);
oos.close();
s.close();
} catch (IOException e) {
out.println ("Error inserting." + e);
return;
void main(String args[]){
args[0]=n;
if(args.length==1)
com cc=new com("sentri.com",0,System.out,args[0]);
//return true;
else if(args.length==0)
com cc=new com("sentri.com",0,System.out);
//return false;
/my html file
the html file:
<html>
<body>
<hr>
<applet
code=j.class
width = 200
height = 200
>
</applet>
<hr>
</body>
</html>
Could anyone help me pls?

Answer 1

Well, if you want all the buttons to be shown... override
update(Graphics g) method of applet..in your class that extends Applet class.
Tufail