Using java on linux v/s windows

wondering if anyone could help me out here.
can't seem to find a lot of doucumentation on this .. or may be i was just searching using the wrong key words!!!

Hi again,
coz i just
learnt from the other post u can't run certain exec
commands...wat else can and can't u do.?just try it. it SHOULD NOT be different except when you try to access
system specific thinks like interacting with system processes, file handling and so on. But of course you can run exec commands, but you
will see that the command has to be different. I wrote on Linux and on
Windows (ok, I never tried to port a program between the platforms) and
I can say it is not that different.
Adrian

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Java on Linux vs. Windows

Dear All,
I was able to write below AES/CFB/NoPadding encryption/decryption program (with many thanks to the Internet) and it works fine on Windows. But it's "getByte()" gives problems on Linux.
Which is the "symmKey.length()" inside "SymmCipher" constructor is only 15 chars. But "symmKey.getBytes().length" has become 33.
Can anybody answer?
Thanks in advanced.
- amilww
// aesDemo.java
class aesDemo
     public static void main(String[] args) throws Exception
          String keyHexStr = "CAABBCCDDEE11223344556677889900F";
          String ivStr     = "0000000000000001";
          String inputStr = "This in a test message";
          // Intermediate variables
          String cipherTextStr, plainTextStr,
                 reqHexMsgStr, repHexMsgStr,
                 repMsgStr;
          SymmCipher symmCipher = new SymmCipher("AES/CFB/NoPadding",
                                                 new String(Util.hex2Bytes(keyHexStr)),
                                                 ivStr);
          // Encrypt the input string
          cipherTextStr = symmCipher.encrypt(inputStr);
          // Convert to an uppercase Hex request string
          reqHexMsgStr = Util.bytes2Hex(cipherTextStr.getBytes()).toUpperCase();
          // Obtain the reply; assume to be the request
          repHexMsgStr = reqHexMsgStr;
          // Convert reply hex message to a string
          repMsgStr = new String(Util.hex2Bytes(repHexMsgStr));
          // Decrypt the reply string
          plainTextStr = symmCipher.decrypt(repMsgStr);
          // Debub output
          System.out.println("=============================================");
          System.out.println("Encrypting/decrypting using AES/CFB/NoPadding");
          System.out.println("---------------------------------------------");
          System.out.println("Input String: '" + inputStr + "'");
          System.out.println("Encr request: '" + cipherTextStr + "'");
          System.out.println("Req Hex Msg: '" + reqHexMsgStr + "'");
          System.out.println("Rep Hex Msg: '" + repHexMsgStr + "'");
          System.out.println("Encr reply:   '" + repMsgStr + "'");
          System.out.println("Response:     '" + plainTextStr + "'");
          System.out.println("=============================================");
// SymmCipher.java
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
class SymmCipher
     private String cipherForm;
     // e.g.: "AES/CFB/NoPadding", "DES/CTR/NoPadding", "DES/ECB/PKCS5Padding"
     private String cipherMethod;
     private SecretKeySpec   keySpec;
     private IvParameterSpec ivSpec;
     private Cipher          cipher;
     public SymmCipher(String cipherForm, String symmKey, String iv) throws Exception
          this.cipherForm   = cipherForm;
          this.cipherMethod = this.cipherForm.split("/")[0];
          this.keySpec = new SecretKeySpec(symmKey.getBytes(), this.cipherMethod);
          this.ivSpec = new IvParameterSpec(iv.getBytes());
          this.cipher = Cipher.getInstance(this.cipherForm);
     public String encrypt(String plainText) throws Exception
          // Encrypting...
          this.cipher.init(Cipher.ENCRYPT_MODE, this.keySpec, this.ivSpec);
          return new String(this.cipher.doFinal(plainText.getBytes()));
     public String decrypt(String cipherText) throws Exception
          // Decrypting...
          this.cipher.init(Cipher.DECRYPT_MODE, this.keySpec, this.ivSpec);
          return new String(this.cipher.doFinal(cipherText.getBytes()));
// Util.java
class Util
     public static String bytes2Hex(byte buf[])
          StringBuffer strbuf = new StringBuffer(2 * buf.length);
          for (int i = 0; i < buf.length; i++)
               if (((int) buf[i] & 0xff) < 0x10)
                    strbuf.append("0");
               strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
          return strbuf.toString();
     public static byte[] hex2Bytes(String hex)
          int    len = hex.length();
          byte[] buf = new byte[((len + 1) / 2)];
          int i = 0, j = 0;
          if (1 == (len % 2))
               buf[j++] = (byte) hexDigit(hex.charAt(i++));
          while (i < len)
               buf[j++] = (byte) ((hexDigit(hex.charAt(i++)) << 4) |
               hexDigit(hex.charAt(i++)));
          return buf;
      * Returns the number from 0 to 15 corresponding to the hex digit <i>ch</i>.
      * @param ch hex digit character (must be 0-9A-Fa-f)
      * @return   numeric equivalent of hex digit (0-15)
     public static int hexDigit(char ch)
          if (('0' <= ch) && ('9' >= ch))
               return ch - '0';
          if (('A' <= ch) && ('F' >= ch))
               return ch - 'A' + 10;
          if (('a' <= ch) && ('f' >= ch))
               return ch - 'a' + 10;
          return(0);     // any other char is treated as 0
}

This statement
     return new String(this.cipher.doFinal(plainText.getBytes()));     has two problems.
1) It relies on the default character encoding when converting the plainText to bytes and the default character encoding is platform, operating system and user dependent. It is far far better to specify an encoding yourself - I always use utf-8.
2) You are converting the essentially random binary result of the encryption to a String using new String(encrypted bytes). String should never be used as a container for binary data unless something like Hex or Base64 is used because, depending on the character encoding, it is not reversible for most character encoding. If you need a Hex or Base64 encoder then Google for Jakarta Commons Codec.

Using java API (dns_sd.jar) in Windows XP does not discover any service

Hi,
I have a bonjour discoverable service running on an Ipad and used the DNSSD.resolve java API to discover the service. I installed bonjour for windows and set the class path to take the dns_sd.jar file. I verified that the dnsResponder service is running... However, I am not able to discover the service. I have the same program running on a Mac and there is able to discover the service all the times. I hope someone has experienced the same problem and have a suggestion/solution to post. Thanks in advance.
--Beto

Are you doing any JNI or native calls during start-up? That's my quess.
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Hi,
I am very new to Linux & trying to move my application from Windows to Linux.
I am downloading one database(*.mdb) file from an url & want to select records from tables & add them to my My Sql database.
Is there any way to connect to Access database on Linux machine ( Without using different Windows machine having Ms Access installed).
Thanks in advance.
Regards,
Veena

I am having the same problem.
jackcess worked fine with Access 2000.
But i want to work with Access having previous version (probably 97).
Is there any way to do this?

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Hello,
Using the JSP API supplied with JDK1.4, I was able to print successfully the following types of documents :
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2. GIF, JPG... (images)
3. PostScript files.
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Thanks
TJ

You will need to load the html into something that can render html. The printer doesn't know how to do it. It just sees plain text that you are sending. Try using JTextPane or JEditorPane (I think). It can render html files for you. Then just print that component.
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2) Set contents of pane as the html file or string you want to print.
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Problem of accesing MS Acess database on Linux using Java

Below is my java code and errors found. Can anyone guide me tell me what is the problem and how to success access the .mdb file using Java on Linux?
import java.sql.*;
class readmdb
{      public static void main(String[] args)
{    String url;
Connection con;
Statement stmt;
try
{     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
catch(java.lang.ClassNotFoundException e)
{    System.out.print("ClassNotFoundException: ");
System.out.println(e.getMessage());
try
{     con = DriverManager.getConnection("jdbc:odbc:DRIVER={/usr/local/lib/libmdbodbc.o.O}};DBQ=/home/powerstation/db/Database.mdb");
stmt = con.createStatement();
stmt.close();
con.close();
catch(SQLException ex)
{ System.err.println("SQLException: " + ex.getMessage());
Errors messages found after i executed the java code
shown above on linux platform.
Exception in thread "main"
java.lang.NullPointerException
at sun.jdbc.odbc.JdbcOdbcDriver.initialize(JdbcOdbcDriver.java:436)
at sun.jdbc.odbc.JdbcOdbcDriver.connect(JdbcOdbcDriver.java:153)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
atjava.sql.DriverManager.getConnection(DriverManager.java:193)
at readmdb.main(readmdb.java:27)

jschell,
ODBC shell is the odbc.ini or odbcinst.ini? No.
The shell is something that you explicitly installed. Just like you installed Apache, or perl, or a C++ compiler, or even a CD driver.
If yes,
What is the difference between odbc.in and
odbcinst.ini? No idea. But on a windows box those are ini files that specify odbc info. I don't think ini files are going to help on linux.
Which of them will be execute when i
want to establish a connection using "jdbc:odbc:...."
in DriverManager.getConnection?I am rather sure that neither of them would 'execute'
>
Is it MS Access ODBC linux driver is the file like
libodbc.so, libmdbodbc.so, libmdbsql.so and so on?No idea, but I doubt it.
What makes you think that you even have a MS Access ODBC linux driver on your box?
Then, can u tell me which is MS Access ODBC linux
driver or what is the driver file name for MS Access
ODBC linux driver?Nope.
If you installed a MS Access ODBC linux driver, then the ODBC shell will know where it is.
And if you did install such a driver you should post the link where you got it here, because as far as I know, there is no such driver (nor is there one for MS SQL Server.)

How to use Java Robot to click the same button multiple times

Hi All,
I am trying to use Java Robot to turn a Windows utility located on the Desktop by clicking the same button on and then off with the following code:
1. Robot robot1 = new Robot();
2. robot1.mouseMove(400,180);
    // Turn on the utility
3. robot1.delay(100);
4. robot1.mousePress(InputEvent.BUTTON1_MASK);
5. robot1.delay(100);
6. robot1.mouseRelease(InputEvent.BUTTON1_MASK);
    //Wait for 2 minutes
7. robot1.delay(200);
    // Move the mouse to disconnect button
8. robot1.mouseMove(400,180);
    // Turn off the utility
9. robot1.mousePress(InputEvent.BUTTON1_MASK);
10. robot.delay(100);
11. robot.mouseRelease(InputEvent.BUTTON1_MASK);However, only the first click (line 1 - 7) worked. Everything from step 8 onwards doesn't appear to be doing anything. Even instantiating another robot2 to carry out step 8 - 11 did not work either. Also have tried running steps 9 - 11 only. ie skip 8.
My aim is to turn this tool on and off at regular interval.
Any assistance would be greatly appreciated.
Thanks in advance,
Jack

Hi darth_code_r and Vincent,
Both you and Vincent are right about insufficient time between the release ( 6 ) of mouse button and step ( 9 ) press the same button again to turn it off. You are also correct in saying that it was not necessary to move the mouse again ( 8 ) since it was sitting on the right button already.
Below is the code I have ended up with which worked for me:
1. Robot robot1 = new Robot();
2. robot1.mouseMove(390,150);
4. robot1.mousePress(InputEvent.BUTTON1_MASK);
6. robot1.mouseRelease(InputEvent.BUTTON1_MASK);
     //Wait for 3 minutes
7. robot1.delay(30000);
9. robot1.mousePress(InputEvent.BUTTON1_MASK);
11. robot1.mouseRelease(InputEvent.BUTTON1_MASK);This utility also takes a few seconds to turn itself on and vice versa. As a result, it is necessary to give it sufficient time to turn on prior to turning it off again with the second mouse press.
Thanks to both of you very much,
Jack

Using java on windows vista 64 bit

Hi, I am using a program for the univercity which use java, and it work fime on 32 bit operation systems such as ubuntu linux and XP/vista... but when I try to run it on the vista 64 bit on my AMD Athlon 64 bit I get the msg:
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at sun.awt.shell.Win32ShellFolderManager2.get(Unknown Source)
at sun.awt.shell.ShellFolder.get(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsLookAndFeel$LazyWindowsIcon.cr
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at javax.swing.UIDefaults.getFromHashtable(Unknown Source)
at javax.swing.UIDefaults.get(Unknown Source)
at javax.swing.MultiUIDefaults.get(Unknown Source)
at javax.swing.UIDefaults.getIcon(Unknown Source)
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at javax.swing.plaf.basic.BasicFileChooserUI.installIcons(Unknown Source)
at javax.swing.plaf.basic.BasicFileChooserUI.installDefaults(Unknown Source)
at javax.swing.plaf.basic.BasicFileChooserUI.installUI(Unknown Source)
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at javax.swing.JFileChooser.updateUI(Unknown Source)
at javax.swing.JFileChooser.setup(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at SimulatorsGUI.ROMComponent.<init>(Unknown Source)
at SimulatorsGUI.CPUEmulatorComponent.<init>(Unknown Source)
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Amir

Yes.
Mylenium

How to run SQL script file on Linux using Java ?

Hi,
I need to execute .sql file using java. I used following approach for this.
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in.close();
process.destroy();
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Above code working appropriate on Windows but not on Linux.
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Regards,
Ajay
Edited by: Ajay Sharma on Nov 21, 2012 6:43 PM

Hi gimbal2,
about code
jTextArea1.setText(e1.getMessage());I am using this code so that the user will be prompted with a message rather than stack trace.
About the issue I am getting on linux i believe its because of following statement.
processBuilder = new ProcessBuilder("sqlplus",userName+"/"+password+"@"+databaseName, script_location); //ORACLERegards,
Ajay
Edited by: Ajay Sharma on Nov 23, 2012 12:05 PM
Edited by: Ajay Sharma on Nov 23, 2012 12:06 PM

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in mac
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Open PDF file in linux using java

Hi..
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I am able to open PDF in windows and mac using this code
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in mac
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appi wrote:
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I have problems using RMI between linux and windows.
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When a linux client disconnect, first time that server try to call a method of this client, a rmi.ConnectException is generated so server can catch it, mark the client as disconnected and won't communicate with it anymore.
When a windows client (tested on XP and Vista) disconnect, no exceptions are generated (I tryed to catch all the rmi exception), so server cannot know that client is disconnected and hangs trying to communicate with the windows client.
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O.C.

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Hi,
I suggest you to check the supported server for B1 in this link:
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BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream)));
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Using java on linux v/s windows

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