Mozilla 1.7.x hangs in applet code on RH Linux with JRE 1.5.0

Hi all,
From my applet code when an URLConnection.getInputStream() method is called the browser hangs, if authentication is turned on the webserver.
This works with jre 1.4.2 on linux, for the matter on windows with Jre1.5 also.
Also it works on 1.5 if suthentication is not set.
So it is this particular combination of (jre1.5/mozilla on linux/authentication) that doesnot work :):).
I tried to set the auth header, but nothing seem to help.
String login = "userid"+":"+"password";
String encodedLogin = new sun.misc.BASE64Encoder().encode(login.getBytes());
httpsCon.setRequestProperty("Authorization", "Basic " + encodedLogin);
Searched on the sun/mozilla sites to see if any known issues, couldn't find any.
Thanks
RT

Just to add upon that a simple code like this will hang
String str = "https://ppp.qqq.com/admin/50_splash.gif";
try {
URL url = new URL(str);
URLConnection con = url.openConnection();
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
con.setDoInput(true);
try {
con.connect(); //-->hangs here
It looks to me like at this point plugin tries to popup the authentication dialog box but it cannot.
Thanks
RT

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[email protected]
//This program was completely written by Peter Wetsel.
//If there are any questions about this code you
//can email me at [email protected]
//To get it to compile using jdk type "javac -nowarn battle.java".
import java.util.*;
import java.lang.*;
import java.awt.*;
import java.applet.*;
import java.net.*;
import java.lang.*;
public class battle extends java.applet.Applet implements Runnable {
 Color col;
 String message= new String("");//holds the message placed in the upper left
 String Status = new String("");
 String message2[]= new String[5];//holds the destroyed messages in order for repainting.
 int hits=0;//the total number of hits by the player
 int numDestroyed=0;//the number of ships destroyed by the player
 int battlepos[]=new int[4];//the 4 positions of the battleship
int carrierpos[]=new int[5];//the 5 positions of the carrier
 int subpos[]=new int[3];//the 3 positions of the submarine
 int patrolpos[]=new int[2];//the 2 positions of the patrol boat
 int destroyerpos[]=new int[3]; //the 3 positions of the destroyer
 int guesses=0;// the number of guesses by the player
 int player[][]=new int[10][10]; //to hold the positions of the player.(not until version 2)
 int guessed[][]=new int[10][10]; //hold the places that have been guessed by the player
 int computer[][]=new int[10][10]; //holds where the computers ships are
 int battleshipHitCt, destroyerHitCt, subHitCt, patrolHitCt, carrierHitCt;//keeps the hit count for each of the ships
 boolean init=false;//false until play is pushed.
 boolean ok=false;//boolean that is true if current boat position chosen by random is ok(getcarrier(), etc.)
 boolean battleOK=true;//false when the type of ship is destroyed
 boolean patrolOK=true;//...
 boolean subOK=true;//...
 boolean destroyerOK=true;//...
 boolean carrierOK=true;//...
 boolean won=false;//true when the player has won
 int o;
public static void main (String args [])
Frame frame = new Frame () ;
battle applet = new battle () ;
frame.add (applet) ;
applet.init () ;
applet.paint(g);
applet.start () ;
 public void getCarrier(){
 int x, y, dir; //will hold a random x & y coordinate(0-9), and a random direction(0-1)(N,E,S,W)
 x=(int)(10*Math.random());
 y=(int)(10*Math.random());
 dir=(int)(100*Math.random()/25);
 if(dir==0)
 while(y<4){
 y=(int)(10*Math.random());
 for (int i=0; i<5; i++){
 computer[x][y-i]=1;
 carrierpos=x*10+y-i;
 if (dir==1)
 while(x>5){
 x=(int)(10*Math.random());
 for (int i=0; i<5; i++){
 computer[x+i][y]=1;
 carrierpos[i]=(x+i)*10+y;
 if (dir==2)
 while(y>5){
 y=(int)(10*Math.random());
 for (int i=0; i<5; i++){
 computer[x][y+i]=1;
 carrierpos[i]=x*10+y+i;
 if (dir==3)
 while(x<4){
 x=(int)(10*Math.random());
 for (int i=0; i<5; i++){
 computer[x-i][y]=1;
 carrierpos[i]=(x-i)*10+y;
 public void getBattle(){
 int x, y, dir;
 x=(int)(10*Math.random());
 y=(int)(10*Math.random());
 dir=(int)(100*Math.random()/25);
 while(!ok){
 ok=true;
 x=(int)(10*Math.random());
 y=(int)(10*Math.random());
 dir=(int)(100*Math.random()/25);
 if(dir==0)
 while(y<3){
 y=(int)(10*Math.random());
 for (int i=0; i<4; i++){
 o=computer[x][y-i];
 if (o==1){
 ok=false;
 if (dir==1)
 while(x>6){
 x=(int)(10*Math.random());
 for (int i=0; i<4; i++){
 o=computer[x+i][y];
 if (o==1){
 ok=false;
 if (dir==2)
 while(y>6){
 y=(int)(10*Math.random());
 for (int i=0; i<4; i++){
 o=computer[x][y+i];
 if (o==1){
 ok=false;
 if (dir==3)
 while(x<3){
 x=(int)(10*Math.random());
 for (int i=0; i<4; i++){
 o=computer[x-i][y];
 if (o==1){
 ok=false;
 if(dir==0)
 for (int i=0; i<4; i++){
 computer[x][y-i]=1;
 battlepos[i]=x*10+y-i;
 if (dir==1)
 for (int i=0; i<4; i++){
 computer[x+i][y]=1;
 battlepos[i]=(x+i)*10+y;
 if (dir==2)
 for (int i=0; i<4; i++){
 computer[x][y+i]=1;
 battlepos[i]=x*10+y+i;
 if (dir==3)
 for (int i=0; i<4; i++){
 computer[x-i][y]=1;
 battlepos[i]=(x-i)*10+y;
 public void getSub(){
 int x, y, dir;
 x=(int)(10*Math.random());
 y=(int)(10*Math.random());
 dir=(int)(100*Math.random()/25);
 while(!ok){
 ok=true;
 x=(int)(10*Math.random());
 y=(int)(10*Math.random());
 dir=(int)(100*Math.random()/25);
 if(dir==0)
 while(y<2){
 y=(int)(10*Math.random());
 for (int i=0; i<3; i++){
 o=computer[x][y-i];
 if (o==1){
 ok=false;
 if (dir==1)
 while(x>7){
 x=(int)(10*Math.random());
 for (int i=0; i<3; i++){
 o=computer[x+i][y];
 if (o==1){
 ok=false;
 if (dir==2)
 while(y>7){
 y=(int)(10*Math.random());
 for (int i=0; i<3; i++){
 o=computer[x][y+i];
 if (o==1){
 ok=false;
 if (dir==3)
 while(x<2){
 x=(int)(10*Math.random());
 for (int i=0; i<3; i++){
 o=computer[x-i][y];
 if (o==1){
 ok=false;
 if(dir==0)
 for (int i=0; i<3; i++){
 computer[x][y-i]=1;
 subpos[i]=x*10+y-i;
 if (dir==1)
 for (int i=0; i<3; i++){
 computer[x+i][y]=1;
 subpos[i]=(x+i)*10+y;
 if (dir==2)
 for (int i=0; i<3; i++){
 computer[x][y+i]=1;
 subpos[i]=x*10+y+i;
 if (dir==3)
 for (int i=0; i<3; i++){
 computer[x-i][y]=1;
 subpos[i]=(x-i)*10+y;
 public void getDestroyer(){
 int x, y, dir;
 x=(int)(10*Math.random());
 y=(int)(10*Math.random());
 dir=(int)(100*Math.random()/25);
 while(!ok){
 ok=true;
 x=(int)(10*Math.random());
 y=(int)(10*Math.random());
 dir=(int)(100*Math.random()/25);
 if(dir==0)
 while(y<2){
 y=(int)(10*Math.random());
 for (int i=0; i<3; i++){
 o=computer[x][y-i];
 if (o==1){
 ok=false;
 if (dir==1)
 while(x>7){
 x=(int)(10*Math.random());
 for (int i=0; i<3; i++){
 o=computer[x+i][y];
 if (o==1){
 ok=false;
 if (dir==2)
 while(y>7){
 y=(int)(10*Math.random());
 for (int i=0; i<3; i++){
 o=computer[x][y+i];
 if (o==1){
 ok=false;
 if (dir==3)
 while(x<2){
 x=(int)(10*Math.random());
 for (int i=0; i<3; i++){
 o=computer[x-i][y];
 if (o==1){
 ok=false;
 if(dir==0)
 for (int i=0; i<3; i++){
 computer[x][y-i]=1;
 destroyerpos[i]=x*10+y-i;
 if (dir==1)
 for (int i=0; i<3; i++){
 computer[x+i][y]=1;
 destroyerpos[i]=(x+i)*10+y;
 if (dir==2)
 for (int i=0; i<3; i++){
 computer[x][y+i]=1;
 destroyerpos[i]=x*10+y+i;
 if (dir==3)
 for (int i=0; i<3; i++){
 computer[x-i][y]=1;
 destroyerpos[i]=(x-i)*10+y;
 public void getPatrol(){
 int x, y, dir;
 x=(int)(10*Math.random());
 y=(int)(10*Math.random());
 dir=(int)(100*Math.random()/25);
 while(!ok){
 ok=true;
 x=(int)(10*Math.random());
 y=(int)(10*Math.random());
 dir=(int)(100*Math.random()/25);
 if(dir==0)
 while(y<1){
 y=(int)(10*Math.random());
 for (int i=0; i<2; i++){
 o=computer[x][y-i];
 if (o==1){
 ok=false;
 if (dir==1)
 while(x>8){
 x=(int)(10*Math.random());
 for (int i=0; i<2; i++){
 o=computer[x+i][y];
 if (o==1){
 ok=false;
 if (dir==2)
 while(y>8){
 y=(int)(10*Math.random());
 for (int i=0; i<2; i++){
 o=computer[x][y+i];
 if (o==1){
 ok=false;
 if (dir==3)
 while(x<1){
 x=(int)(10*Math.random());
 for (int i=0; i<2; i++){
 o=computer[x-i][y];
 if (o==1){
 ok=false;
 if(dir==0)
 for (int i=0; i<2; i++){
 computer[x][y-i]=1;
 patrolpos[i]=x*10+y-i;
 if (dir==1)
 for (int i=0; i<2; i++){
 computer[x+i][y]=1;
 patrolpos[i]=(x+i)*10+y;
 if (dir==2)
 for (int i=0; i<2; i++){
 computer[x][y+i]=1;
 patrolpos[i]=x*10+y+i;
 if (dir==3)
 for (int i=0; i<2; i++){
 computer[x-i][y]=1;
 patrolpos[i]=(x-i)*10+y;
 public void run(){// to be in here so can compile
 public void init() {
 for (int i=0; i<10; i++){//initializes the guessed matrix to be all 2's(not been guessed)
 for (int j=0;j<10; j++){
 guessed[i][j]=2;
 for (int i=0; i<2; i++){//initializes array to be all zeros
 patrolpos[i]=0;
 for (int i=0; i<2; i++){
 destroyerpos[i]=0;
 for (int i=0; i<2; i++){
 subpos[i]=0;
 for (int i=0; i<2; i++){
 carrierpos[i]=0;
 for (int i=0; i<2; i++){
 battlepos[i]=0;
 battleshipHitCt=0;//initialize all hit counts
 destroyerHitCt=0;
 subHitCt=0;
 patrolHitCt=0;
 carrierHitCt=0;
 //get all boat positions
 getCarrier();
 ok=false;
 getBattle();
 ok=false;
 getDestroyer();
 ok=false;
 getSub();
 ok=false;
 getPatrol();
 public void paint(Graphics g) { //this is the shots paint method... draws a line from its last position to its current position, basically
 if (!init && !won){//draws screen before play is pushed
 g.setColor(col.white);
 g.fillRect(0,0,600,320);
 g.setColor(col.black);
 g.fillRect(20,20,30,25);
 g.setColor(col.white);
 g.drawString("PLAY", 23,30);
 g.setColor(col.black);
 g.drawString("This is different that usual battleship, here the goal is",23,65);
 g.drawString("to find all of the computers ships in the least number of guesses.",23,85);
 g.drawString("<30 turns --- You have too much luck!", 23, 105);
 g.drawString("31-50 turns --- Excellent!", 23, 125);
 g.drawString(">=51 turns --- You have no skills!", 23, 145);
 g.drawString("PRESS PLAY TO BEGIN", 23, 165);
 if (init && !won){//draws grid and messages
 g.setColor(col.black);
 g.fillRect(0,0,600,320); //makes big, black rectangle washover
 g.setColor(col.white);
 g.drawString("# of Guesses = " + guesses,500, 280);
 for (int i=0; i<11; i++)
 g.drawLine(20,20+i*28, 300, 20+i*28);
 for (int i=0; i<11; i++)
 g.drawLine(20+i*28,20,20+i*28,300);
 char ch='A';
 for (int i=0; i<10; i++){//draws letter accross the top
 g.drawString(ch+" ",30+28*i,13);
 ch++;
 ch='1';
 for (int i=0; i<9; i++){//draws numbers down the side
 g.drawString(ch+" ",10,40+28*i);
 ch++;
 g.drawString("10", 6,290);
 g.drawString(message,420,40);
 for (int i=0; i<numDestroyed; i++){
 g.drawString(message2[i], 305, 40+(i+1)*20);
 g.setColor(col.black);
 //next puts in any circles already guessed
 for (int i=0; i<10; i++)
 for (int j=0; j<10;j++){
 if (guessed[i][j]==1) {
 g.setColor(col.red);
 g.fillOval(i*28+30, j*28+30, 10,10);
 if (guessed[i][j]==0) {
 g.setColor(col.white);
 g.fillOval(i*28+30, j*28+30, 10,10);
 public boolean seeifahit(int x, int y){//sees if the shot was a hit or not
 if(computer[x][y]==1)
 return true;
 return false;
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 for (int i=0;i<4; i++)
 if (battlepos[i]==x*10+y){
 battleshipHitCt++;
 return "Battleship";
 for (int i=0;i<3; i++)
 if (subpos[i]==x*10+y){
 subHitCt++;
 return "Submarine";
 for (int i=0;i<2; i++)
 if (patrolpos[i]==x*10+y){
 patrolHitCt++;
 return "Patrol Boat";
 for (int i=0;i<5; i++)
 if (carrierpos[i]==x*10+y){
 carrierHitCt++;
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 if (destroyerpos[i]==x*10+y){
 destroyerHitCt++;
 return "Destroyer";
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 if (!won){
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 subOK=false;
 return true;
 if(patrolHitCt==2 && patrolOK)
 patrolOK=false;
 return true;
 if(destroyerHitCt==3 && destroyerOK)
 destroyerOK=false;
 return true;
 return false;
 public boolean mouseDown(Event e, int x, int y) {//handles when a mouse key is pressed(either key)
 String type= new String("");
 if (!won){
 message="";
 Graphics g = getGraphics() ;
 g.setColor(col.white);
 int xindex, yindex, val;
 if (x>20 && y>20 && y<300 && x<300 && init){
 guesses++;
 g.setColor(col.black);
 g.fillRect(490,260, 550, 285);
 g.setColor(col.white);
 g.drawString("# of Guesses = " + guesses,500, 280);
 g.setColor(col.black);
 g.fillRect(419,30,580,95);
 g.setColor(col.white);
 xindex=(x-20)/28;//converts x coordinate into index(A-J) in form of (0-9)
 yindex=(y-20)/28;//converst y coordinate into index(0-9)
 val=guessed[xindex][yindex];
 if (val==2){
 if (seeifahit(xindex,yindex)){
 type=getshiptype(xindex, yindex);
 hits++;
 g.setColor(col.white);
 guessed[xindex][yindex]=1;
 if (!destroyed()){
 message=type + " Hit";
 g.drawString(message, 420, 40);
 else{
 g.setColor(col.white);
 message2[numDestroyed]=new String("");
 message2[numDestroyed]=type + "Destroyed";
 numDestroyed++;
 g.drawString(message2[numDestroyed-1] , 305, 40+(numDestroyed)*20);
 g.setColor(col.red);
 else guessed[xindex][yindex]=0;
 g.fillOval(xindex*28+30, yindex*28+30, 10,10);
else {
 g.setColor(col.white);
 message="That has already been guessed";
 g.drawString(message,420,40);
 if (x>20 && x<40 && y>20 && y<40 && !init){
 init=true;
 paint(g);
 if (hits>=17){
 gameOver();
 System.exit(0);
 return true;

replace following in main method
applet.paint(g); by
repaint(); and
applet.start() by
// applet.start() at least compile your source code and if all runs the normal way it shoul be an application
PS: i think there is a way in javac to tell it your source is an applicat. and not an applet

applet code multiple classes help :(

Ok, i made an applet which have 2 .class files one is AppTs.class and other is MyPot.class, what I need to write to lets say index.html
to make that applet viewable in browser. Thx.
I try this but it say Applet failed to load...
<HTML>
<BODY>
<APPLET CODE=AppTs.class WIDTH=200 HEIGHT=100>
<APPLET CODE=MyPot.class WIDTH=200 HEIGHT=100>
</APPLET>
</BODY>
</HTML>

Are you sure, could be because, I am using Pirc bot Framework, which isn't in standard Java libraries, is maybe that causing problem, because, applet works perfectly when i run it from Eclipse IDE.
And that your HTML code that you write, it makes 2 applets, but i need only one because GUI is only in AppTs, why is that happening neither?
Edited by: systat on Mar 28, 2008 11:35 AM

Don't want to re-execute applet code, when refresh browser

Hi,
I am developing online exam project, here my issue is in timer, I am creating timer in thread.sleep(1000); (ie) 1000 mili sec = 1 sec. once exam started, i am started reducing timer value. While moving to next question, I want previous Applet timer value in next page. Here i am getting initial value of each time refreshing,
example:
suppose timer running in browser like this : 00:00:46 ----> when refresh same page i need value reduce from 00:00:46, But its reload from initial value (ie): 00:00:59 in below example code.
Here is my Applet code :
import java.awt.*;
import java.util.*;
import java.applet.*;
import java.net.*;
public class myclock1 extends Applet implements Runnable
Thread t,t1;
int hour=0,minute=0,second=0;
URL targetURL;
String URLString = "http://localhost:8080/testing/examresult.jsp";
AppletContext context;
public void start()
minute = Integer.parseInt(getParameter("min"));
second = Integer.parseInt(getParameter("sec"));
context = getAppletContext();
t = new Thread(this);
t.start();
public void run()
t1 = Thread.currentThread();
repaint();
public void paint(Graphics g)
if(hour==0 && minute==0 && second==0)
try
targetURL = new URL(URLString);
catch (MalformedURLException e)
// Code for recover from the exception
context.showDocument(targetURL);
t.destroy();
t1.destroy();
this.destroy();
second--;
if(second==-1)
second = 59;
minute = minute-1;
if(minute==0)
if(hour>=1)
hour = hour - 1;
minute = 59;
g.drawString(hour + ":" + minute + ":" + second, 20, 30);
repaint();
try{
t1.sleep(1000); /// 1000 mili sec = 1 sec
catch(InterruptedException e)
In JSP Page Code:
<jsp:plugin type="applet" code="myclock1.class" height="150" width="300">
<jsp:params>
<jsp:param name="min" value="0" />
<jsp:param name="sec" value="60" />
</jsp:params>
</jsp:plugin>
How to do that, Urgent Plz help me.
Thanks in Advance,
S.Shyam.

Is it SAX, Dom, JAXB or something else you are talking about?

Help with simple applet code

i wanted to write a applet that would display a image,(this is my first program) i wrote the code shown below,but image space is emptly when i load it up with any browser.....i ran the code in netbeans,,, i am a novice, any piece of advice also wud be helpful.........
<applet code="imagereadingapplet" width=500 height=500>
<param name="img" value="kollam.gif">
</applet>
import java.applet.*;
import java.awt.*;
* @author raman
public class imagereadingapplet extends Applet {
* Initialization method that will be called after the applet is loaded
* into the browser.
Image img;
@Override
public void init() {
img = getImage(getDocumentBase(),"kollam.gif");
@Override
public void paint(Graphics g){
g.drawImage(img,0,0,this);
// TODO overwrite start(), stop() and destroy() methods
}

Hi,
First advice imagereadingapplet -> ImageReadingApplet (Java name convention).
Second image file name is hard coded so you don't have to set param for the applet (Best would be not to hard code this name).
Finally maybe the most interesting, It seems that image kollam.gif is not at root folder.
I don't really know netbeans but your image must be in bin folder, the same as imagereadingapplet.class.

Applet code protection

Hi
I'm developing a commercial web application, and I'd like some advices about applet code protection.
This applet we need will allow the visual design of some hardware. The parameters that are used in its creation are all visible and user supplied, and those are the same that are communicated to the server to store the design data, so this is not the security issue.
The main point is about mathematical formula, some static parameters (data tables) and a few algorithms used to turn the parameters into a visual representation (drawn in the applet) and discover a few more advanced hardware design data (like weight, volume, area) based on those input parameters. It is a quite complicated calculation, will be created for a dozens of different hardware types, we are putting a lot of effort into this, and don't want it to be stolen, once the application goes into production.
Legal notices will be in place, but if someone steals the code, even legal actions will not undo the damage. Code techniques I know are checking the host (easy to bypass) and code obfuscation (makes the job harder, but thiefs are people with a lot of patience), and I'm not entirely happy with them, and I couldn't find any more good alternatives around.
A very secure option is making all this sensitive code server side, request parameters and just send an image back to the user, but that would cripple the server with too much math processing and image generation, and much less responsive for the end user (a major issue as well)... those are the reasons I thought about applets in the first place.
Another way that came to my mind was providing an applet just with drawing capabilities, and making it request the needed formula at runtime (our communication is HTTPS), but that does not avoid interception at code level.
I'd appreciate any advice or suggestion you could give, protection approachs or changes.
Many thanks!

dev@java wrote:
The main point is about mathematical formula, some static parameters (data tables) and a few algorithms used to turn the parameters into a visual representation (drawn in the applet) and discover a few more advanced hardware design data (like weight, volume, area) based on those input parameters. It is a quite complicated calculation, will be created for a dozens of different hardware types, we are putting a lot of effort into this, and don't want it to be stolen, once the application goes into production.
Legal notices will be in place, but if someone steals the code, even legal actions will not undo the damage.In terms of risk analysis: exactly what damage could be done by somebody with your code? For example what could I do if I had a copy of your applet which would cause you harm? And what harm would that be?

APPLET CODE WITH PACKAGE

Hello,
I have o code in a package and I do not know how to write the html file the code parameter is not enough I think. Do I have to add package=myapplication?
Thanks in advance
This is my html file
<applet code="myapplication.class" >
</applet>

Let's assume that your Package is named package1 and your applet class file is named applet1.
Now you must place your applet1 in a folder package1.
Now, the html file looks like this
<applet code="package1.applet1" width=300 height=200>
</applet>
You don't need to use codebase if you are in the root directory of the package.
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Mozilla 1.7.x hangs in applet code on RH Linux with JRE 1.5.0

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