• 0

why is my java not working?


Question

hi! I have been coding for a few hours most has gone well untill now and i have hit a wall...

im making an ecrypted chat program and the first person encrypts a string with another string.... the encrypted string is then sent... the encrypted string is then encrypted with a string and sent back the plan is to then decrypt this string and send it back once more but my code has stopped working here.... I have commented where it works and where it doesn't


try {
System.out.println("test..1...2..." + stk); //this happens the varible stk is there and working
DesEncrypter encrypters = new DesEncrypter(stk); //I assume these dont work
String decrypteds = encrypters.decrypt(inputLine); // ^^^^^^^^^^^^^^^^^^^^^^
System.out.println("is working? ---> " + decrypteds); //this does not happen <----------
out.println(decrypteds);
System.out.println("is working? ---> " + decrypteds);
System.out.println("thisith your encryption removed ---> " + decrypteds);
sen = 0;
stk = null;
} catch (Exception e) {

}
[/CODE]

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15 answers to this question

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  • 0

Remove your empty try-catch and you might see what the exception is. This is full of useful information like the nature of the error and where it happened. Here, I don't see where "inputLine" comes from so it might be null, causing an error. Otherwise I don't know what this "DesEncrypter" class is, is it standard in the Java library?

In general you should be running your programs with a debugger attached and have the debugger break immediately on every exception. And stop hiding errors with try-catch statements. You want to find your errors, not pretend like everything works.

  • 0
  On 27/10/2012 at 02:02, Dr_Asik said:

Remove your empty try-catch and you might see what the exception is. This is full of useful information like the nature of the error and where it happened. Here, I don't see where "inputLine" comes from so it might be null, causing an error.

In general you should be running your programs with a debugger attached and have the debugger break immediately on every exception. And stop hiding errors with try-catch statements. You want to find your errors, not pretend like everything works.

it wont let me use "DesEncrypter encrypters =newDesEncrypter(stk)" without throwing and catching :( i dont like them either it could be the inputLine but its not null I have checked (system.out)

i have also worked out it is 100% this line.... "String decrypteds = encrypters.decrypt(inputLine);" hmmm what can it be :/ i use this in other places so i dont know

also no its not a standard class but its all there and was working encrypting and decrypting up to this point

  • 0
  On 27/10/2012 at 02:10, SPEhosting said:

it wont let me use "DesEncrypter encrypters =newDesEncrypter(stk)" without throwing and catching :(

Well there's your error then. You're passing in something invalid in that constructor. Maybe it's null, maybe it's not initialized, maybe DesEncrypter doesn't like getting instantiated with new and has a factory method you should use instead, I don't know, but there's the error. If you were to let it propagate and read what it says, it would tell you the nature of the error, and possibly even suggest how to fix it.

You're not fixing anything by using a try-catch. All you do is allow execution to continue in the body of the catch (which is empty in your case) after the exception is thrown. Basically, here's what happens when you currently execute your code:

   try {
System.out.println("test..1...2..." + stk);
DesEncrypter encrypters = new DesEncrypter(stk); // exception thrown; execution breaks here and resumes at the catch
}
catch (Exception e) { // exception caught
// nothing to do here! exception ignored, we don't know what it said, so we have no way of diagnosing the issue
}
[/CODE]

You could see this yourself, line by line, by running your program in a [b]debugger[/b], like you certainly have if you're using any common Java IDE (Eclipse, Netbeans, IntelliJ etc)

If you really insist on catching your exceptions and not using the most useful tools to find bugs (i.e. a debugger), you should at the very least not entirely ignore them and display their message on the console, i.e.

[CODE]
try {
// code that doesn't work and throws exceptions goes here
}
catch (Exception e) {
system.out.println(e.getMessage()); // let's see what the problem was!
}
[/CODE]

  • 0
  On 27/10/2012 at 02:43, Dr_Asik said:

If you really insist on catching your exceptions and not using the most useful tools to find bugs (i.e. a debugger), you should at the very least not entirely ignore them and display their message on the console, i.e.


try {
// code that doesn't work and throws exceptions goes here
}
catch (Exception e) {
system.out.println(e.getMessage()); // let's see what the problem was!
}
[/CODE]

it didnt throw back any message :(

  • 0
  On 27/10/2012 at 13:46, SPEhosting said:

AHHH I GOT IT !!! given final block not properly padded!!!! .... what does that mean :/

i got something do you know what i means?

if possible can you paste complete method if not too lengthy!

Yes. With stack trace, i can tell you the info. it's the final thing that one can check for any failures in prgm

  • 0
  On 27/10/2012 at 13:48, nitins60 said:

if possible can you paste complete method if not too lengthy!

Yes. With stack trace, i can tell you the info. it's the final thing that one can check for any failures in prgm

http://www.java2s.com/Code/Java/Security/EncryptingwithDESUsingaPassPhrase.htm

this is the method for encrypting ... should tell you what you need to know :p

  • 0
  On 27/10/2012 at 14:01, vcfan said:

check if encrypted message has escape characters like \r or \n, which could mess up the decryption routine and make it not work properly or at all

ermmm it has an =

when its encrypted there should be nothing but dashes in the final string .... maybe thats the problem ?

  • 0
  On 27/10/2012 at 14:09, SPEhosting said:

ermmm it has an =

when its encrypted there should be nothing but dashes in the final string .... maybe thats the problem ?

i meant the message before it is encrypted,

try creating a new project to test out the encryption and decryption only. try encrypting a string without escape characters. do it manually,feed it straight a-z characters, let it encrypt, then decrypt. then test it again with escape characters, and see if your decrypted outputs work correctly both ways. this will help you isolate the problem, if your problem has to do with your crypto routines and libraries.

  • 0

here is all my code lol ::::

SwingChatServer.java


import java.awt.*;
import java.net.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.spec.*;
import java.util.UUID;
import chat.*;
public class SwingChatServer extends SwingChatGUI
{
PrintWriter out;
BufferedReader in;
BufferedReader stdin;
String inputLine, outputLine, collect;
public ButtonHandler bHandler = new ButtonHandler();
public ButtonHandler bH = new ButtonHandler();
public String rgk;
public String stk;
public String lls;
public int sen;
public SwingChatServer (String title)
{
super (title);
bHandler = new ButtonHandler ();
sendButton.addActionListener (bHandler);
synco.addActionListener (bH);
keymaker();
}
private class ButtonHandler implements ActionListener
{
public void actionPerformed (ActionEvent event)
{

if(event.getSource()==sendButton)
{
outputLine = txArea.getText ();
System.out.println ("Server > " + outputLine);
try {

DesEncrypter encrypter = new DesEncrypter(rgk);
String encrypted = encrypter.encrypt(outputLine);
System.out.println("" + encrypted);
out.println (encrypted);

} catch (Exception e) {
//out.println (outputLine);
}
}
if(event.getSource()==synco)
{
System.out.println("YOURNER WISHES TO MAKE THIS A PRIVATE MATTER, CLICK SYNC TO ENCRYPT ALL MESSAGES");
stk = rgk;
System.out.println("thishe key which will encrypt the new key ---> " + stk);
keymaker();
System.out.println("thishe key which will be encrypted ---> " + rgk);
try {
DesEncrypter encrypter = new DesEncrypter(stk);
String encrypted = encrypter.encrypt(rgk);
System.out.println("thisow the key looks encrypted ---> " + encrypted);
out.println (encrypted);
out.println("test");
sen = 1;
} catch (Exception e) {
System.out.println("error
}

}

}
}

public void run () throws IOException
{
ServerSocket serverSocket = null;

try
{
serverSocket = new ServerSocket (4444);
}
catch (IOException e)
{
System.err.println ("Could not listen on port: 4444.");
System.exit (1);
}
Socket clientSocket = null;
try
{
clientSocket = serverSocket.accept ();
}
catch (IOException e)
{
System.err.println ("Accept failed.");
System.exit(1);
}
out = new PrintWriter (clientSocket.getOutputStream (), true);
in = new BufferedReader (new InputStreamReader (clientSocket.getInputStream ()));
//stdin = new BufferedReader (new InputStreamReader (System.in));
out.println ("Welcome to the Chat Server\n");
while ((inputLine = in.readLine ()) != null)
{

lls = inputLine;
if (sen == 1)
{
System.out.println("thisld be the encrypted, encryption ---> " + lls);

try {
System.out.println("test..1+ inputLine + " and now for stk " + stk);
DesEncrypter encrypters = new DesEncrypter(stk);
System.out.println("peeka);
String decrypteds = encrypters.decrypt(inputLine);
System.out.println(decrypteds);
//sen = 0;
//stk = null;
} catch (Exception e) {
System.out.println(e.getMessage());
}
} else {

System.out.println ("Server < " + inputLine);
try {
DesEncrypter encrypter = new DesEncrypter(rgk);

String decrypted = encrypter.decrypt(inputLine);
System.out.println("" + decrypted);
rxArea.setText (decrypted);
} catch (Exception e) {
}
collect = (collect +" \n"+ inputLine);
rxArea.setText (collect);

}
}
out.close();
in.close();
clientSocket.close();
serverSocket.close();
}
public static void main(String[] args) //throws IOException
{

SwingChatServer f = new SwingChatServer ("Chat Server Program");

f.pack ();
f.setVisible(true);
try
{
f.run ();
}
catch (IOException e)
{
System.err.println("Couldn'tfor the connection.");
System.exit(1);
}
}
public void keymaker()
{

String uuid = UUID.randomUUID().toString();
rgk = uuid;
}
}
[/CODE]

SwingChatClient.java

[CODE]
import java.awt.*;
import java.net.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.spec.*;
import java.util.UUID;
import chat.*;
public class SwingChatClient extends SwingChatGUI
{
static Socket socket = null;
static PrintWriter out = null;
static BufferedReader in = null;
public ButtonHandler bHandler, bH;
public String rgk;
public String stk;
public String lls;
public int sen;

public SwingChatClient (String title)
{
super (title);
bHandler = new ButtonHandler();
bH = new ButtonHandler();
sendButton.addActionListener( bHandler );
synco.addActionListener( bH );
keymaker();
}
private class ButtonHandler implements ActionListener
{
public void actionPerformed (ActionEvent event)
{
if (event.getSource()==sendButton)
{
String outputLine;
outputLine = txArea.getText ();
System.out.println ("Client > " + outputLine);
out.println (outputLine);
}
if (event.getSource()==synco)
{
System.out.println("YOURNER WISHES TO MAKE THIS A PRIVATE MATTER, CLICK SYNC TO ENCRYPT ALL MESSAGES");
stk = rgk;
System.out.println("thishe key which will encrypt the new key " + stk);


try {
DesEncrypter encrypter = new DesEncrypter(stk);
String encrypted = encrypter.encrypt(lls);
System.out.println("" + encrypted);
out.println (encrypted);
sen = 1;
} catch (Exception e) {
System.out.println("error
}
}
}
}
public void run () throws IOException
{
try
{
socket = new Socket ("localhost", 4444);
out = new PrintWriter (socket.getOutputStream (), true);
in = new BufferedReader (new InputStreamReader (socket.getInputStream ()));
}
catch (UnknownHostException e)
{
System.err.println ("Don't know about host: .");
System.exit(1);
}
catch (IOException e)
{
System.err.println ("Couldn't get I/O for the connection to: .");
System.exit (1);
}
String fromServer;
while ((fromServer = in.readLine ()) != null)
{
System.out.println ("this should be encrypted " + fromServer);
lls = fromServer;

if (sen == 1)
{

try {
DesEncrypter encrypter = new DesEncrypter(stk);
String decrypted = encrypter.decrypt(fromServer);
rgk = decrypted;
sen = 0;
stk = null;
System.out.println("hello;
} catch (Exception e) {
}

} else {
try {
DesEncrypter encrypter = new DesEncrypter(rgk);

String decrypted = encrypter.decrypt(fromServer);
System.out.println("hmm+ decrypted);
rxArea.setText (decrypted);
} catch (Exception e) {
}
if (fromServer.equals ("Bye.")) break;
}
}
out.close();
in.close();
socket.close();
}
public static void main(String[] args)
{
SwingChatClient f = new SwingChatClient ("Chat Client Program");

f.pack ();
f.setVisible(true);
try
{
f.run ();
}
catch (IOException e)
{
System.err.println("Couldn'tfor the connection to:");
System.exit(1);
}
}
public void keymaker()
{

String uuid = UUID.randomUUID().toString();
rgk = uuid;
}
}
[/CODE]

SwingChatGUI.java

[CODE]
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class SwingChatGUI extends JFrame
{
public JButton sendButton, synco;
public JTextArea txArea, rxArea;

public Container container;

public JPanel n1, s1;


public SwingChatGUI (String title)
{
super (title);

container = getContentPane();
container.setLayout( new FlowLayout() );

txArea = new JTextArea (6, 40);

rxArea = new JTextArea (6, 40);

sendButton = new JButton ("Send");
synco = new JButton ("sync");

container.add (rxArea);
container.add (txArea);
container.add (sendButton);
container.add (synco);
}

public static void main (String[] args)
{
Frame f = new SwingChatGUI ("Chat Program");
f.pack ();
f.setVisible(true);
}
}
[/CODE]

the chat package......is next....

DesEncrypter.java

[CODE]
package chat;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DesEncrypter {
Cipher ecipher;
Cipher dcipher;
byte[] salt = { (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32, (byte) 0x56, (byte) 0x35,
(byte) 0xE3, (byte) 0x03 };
public DesEncrypter(String passPhrase) throws Exception {
int iterationCount = 2;
KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
ecipher = Cipher.getInstance(key.getAlgorithm());
dcipher = Cipher.getInstance(key.getAlgorithm());
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
}
public String encrypt(String str) throws Exception {
return new BASE64Encoder().encode(ecipher.doFinal(str.getBytes()));
}
public String decrypt(String str) throws Exception {
return new String(dcipher.doFinal(new BASE64Decoder().decodeBuffer(str)));
}
}
[/CODE]

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If that's too much of a tough start, Len's Island is temporarily free-to-play now too. This is a top-down perspective survival game with support for up to eight players in co-op, with combat, farming, dungeon diving, and other elements being included. Lastly, Dead by Daylight should be the most familiar to most. The multiplayer four-versus-one asymmetric survival horror game has you assuming the roles of survivors or the killer to see who can come out on top. Big Deals With the Steam Summer Sale only being days away, most publishers and developers are laying low to prepare for the big event. Still, we found quite a few games having some attractive discounts. 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Here are some highlights: Cyberpunk 2077 - $23.99 on GOG God of War - $19.99 on GOG Fallout 4: Game of the Year Edition - $15.99 on GOG Fallout 4: Game of the Year Edition - $15.99 on GOG Dino Crisis Bundle - $15.29 on GOG Devil May Cry HD Collection & 4SE Bundle - $14.84 on GOG The Witcher 3: Wild Hunt - Complete Edition - $9.99 on GOG Vampire: The Masquerade - Bloodlines - $9.99 on GOG SPORE Collection - $7.49 on GOG Papers, Please - $4.99 on GOG Terraria - $4.99 on GOG SWAT 4: Gold Edition - $4.99 on GOG DOOM (2016) - $3.99 on GOG DOOM 3 - $3.99 on GOG CrossCode - $3.99 on GOG Mad Max - $2.99 on GOG Heroes of Might and Magic 3: Complete - $2.49 on GOG Heroes of Might and Magic 4: Complete - $2.49 on GOG World in Conflict: Complete Edition - $2.49 on GOG Alan Wake - $1.49 on GOG Mortal Kombat 1+2+3 - $1.49 on GOG RollerCoaster Tycoon Deluxe - $1.19 on GOG Keep in mind that availability and pricing for some deals could vary depending on the region. That's it for our pick of this weekend's PC game deals, and hopefully, some of you have enough self-restraint not to keep adding to your ever-growing backlogs. As always, there are an enormous number of other deals ready and waiting all over the interwebs, as well as on services you may already subscribe to if you comb through them, so keep your eyes open for those, and have a great weekend.
    • Is there a 'recovery' settings option in Settings? The one where we can rollback to a previous restore point. I find it very useful if there is some issue and I have to rollback to the last stable point.
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