Writing a Java Database

My boss wants me to investigate the feasibility of writing
our own database using Java (despite the fact that there
are many fine third-party ones already out there).
He claims that there is an API within Java designed to
facilitate writing such a database. If this is true, what
is it? The only db-related API I am aware of is JDBC,
and it is my understanding that JDBC is only for accessing
and manipulating an existing database. Therefore I do
not think this is what he is talking about.
Can anyone advise?
Tx

Those are all fine databases, but his concern is,
because they all use the GNU General Public License
(or similar license), that for our product to rely
upon them
would somehow force our product to be goverened by
that license (and hance make it open-source, free,
etc).No, I think your boss's concern is a valid one, but his solution is incorrect. The answer is not to write a database from scratch.
He may be mistaken in this. But it would be
necessary
to distribute the database along with the product,
and
so it is unclear to me whether this makes the
database
part of our product.
Can anyone shed some light on this.
TxI'd recommend that you find candidate databases, get their licenses, and have a lawyer examine them in great detail and explain what each of them means from a legal point of view. If you can find a lawyer who specializes in this kind of thing, so much the better. (You don't say if your company is large or small.)
This is a problem that everyone faces today, but using open source s'ware doesn't obligate anyone to give away the systems they write with it. WebLogic ships with Struts, JSTL, and other Commons software from Apache. Does that mean that everyone who uses it has to give away the stuff they develop with it? Not by a long shot. You need to know what your obligations are. Have a real lawyer explain them to you.
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Hi there,
can you help guy,
I have the NetBeans IDE 4.1,
Oracle 9,
j2sdk1.4.0,
and win xp (on standalone machine)
I remember the old version of NetBeans, you can use Mounting FileSystem for jdbc\oracle\driver
to use the OracleDriver
but I get message error at compiler says that package jdbc.oracle.driver does not exist
please I need help in who to do Mounting FileSystem or other way
here is my code of java
// Database application using Oracle and Java programming Language
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import jdbc.sql.*
import java.awt.*;
public class OracleJavaCustomerWindow extends JFrame
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private JTextField textCId,textCName,textCCity,textCPhone;
private JPanel labelPanel,buttonPanel,textAreaPanel,labelTextAreaPanel;
private JTextArea outputArea;
private JScrollPane scrollPane;
private JButton buttonDisplay,buttonAdd,buttonModifyRecord,buttonUpdate,buttonDelete;
private JButton buttonClear;
private JTextField field1,field2,field3,field4;
private JLabel label1,label2,label3,label4;
private JPanel mixedPanel,mixedPanel2,fieldPanel1,fieldPanel2,fieldPanel3,fieldPanel4;
static Connection sqlconn = null;
// set up GUI with constrictor(IT IS A METHOD. EACHO CLASS AT LEST HAVE ONE)
public OracleJavaCustomerWindow ()
super("Display Oracle Data for Customers");
try{
 DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
 sqlconn= DriverManager.getConnection ("jdbc:oracle:oci:@Kawasaki", "scott", "tiger");
catch(SQLException ex)
System.out.println("SQLException:" + ex.getMessage() + " ");
// add GUI components to container
Container container = getContentPane();
container.setLayout(new FlowLayout(FlowLayout.CENTER));
// Build labelPanel
labelCId = new JLabel(" Customer ID");
labelCName = new JLabel("Customer Name");
 labelCCity = new JLabel("Customer City");
labelCPhone = new JLabel("Customer Phone");
labelPanel = new JPanel();
labelPanel.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));
 labelPanel.add(labelCId);
labelPanel.add(labelCName);
labelPanel.add(labelCCity);
labelPanel.add(labelCPhone);
// Build textAreaPanel
outputArea = new JTextArea(10,30);
outputArea.setEditable(false);
scrollPane = new JScrollPane(outputArea);
textAreaPanel = new JPanel();
textAreaPanel.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));
textAreaPanel.add(scrollPane);
// Build labelTextAreaPanel which contains labelPanel and textAreaPanel
// to be ready for adding to container
labelTextAreaPanel= new JPanel();
labelTextAreaPanel.setLayout(new BorderLayout());
labelTextAreaPanel.add(labelPanel,BorderLayout.NORTH);
labelTextAreaPanel.add(textAreaPanel,BorderLayout.SOUTH);
// Buld buttonPanel
buttonDisplay = new JButton ("Display Table");
buttonClear = new JButton ("Clear");
buttonAdd = new JButton("Add New Record");
buttonUpdate= new JButton("Display Record");
buttonModifyRecord = new JButton("Modify Record");
buttonDelete = new JButton("Delete Record");
buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(6,1,10,5));
buttonPanel.add(buttonAdd);
buttonPanel.add(buttonUpdate);
buttonPanel.add(buttonModifyRecord);
buttonPanel.add(buttonDisplay);
buttonPanel.add(buttonDelete);
buttonPanel.add(buttonClear);
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label1 = new JLabel("Customer Number");
field1 = new JTextField(10);
fieldPanel1 = new JPanel();
fieldPanel1.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));
fieldPanel1.add(label1);
fieldPanel1.add(field1);
// build fieldPanel2
fieldPanel2 = new JPanel();
label2 = new JLabel("Customer Name");
field2 = new JTextField(10);
fieldPanel2.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));
fieldPanel2.add(label2);
fieldPanel2.add(field2);
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fieldPanel3 = new JPanel();
label3 = new JLabel("Customer City");
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fieldPanel3.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));
fieldPanel3.add(label3);
fieldPanel3.add(field3);
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fieldPanel4 = new JPanel();
label4 = new JLabel("Customer Phone");
field4 = new JTextField(10);
fieldPanel4.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));
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fieldPanel4.add(field4);
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// to be ready for adding to container
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mixedPanel.setLayout(new BorderLayout());
 mixedPanel.add(fieldPanel1,BorderLayout.NORTH);
mixedPanel.add(fieldPanel2,BorderLayout.CENTER);
mixedPanel.add(fieldPanel3,BorderLayout.SOUTH);
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mixedPanel2.add(fieldPanel4,BorderLayout.SOUTH);
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container.add(mixedPanel);
container.add(mixedPanel2);
container.setBackground(Color.DARK_GRAY);
container.add(labelTextAreaPanel);
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//----------- method to clear the outputarea
buttonClear.addActionListener(
 // anonymous inner class
new ActionListener()
public void actionPerformed(ActionEvent event)
 outputArea.setText("");
}// actionPerformed
}// anonymous inner class
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buttonDisplay.addActionListener(
//anonymous class
new ActionListener()
 public void actionPerformed(ActionEvent event)
 //Connection sqlca = null;
 Statement sqlStatement = null;
 ResultSet rset = null;
 try{
 //DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
 //sqlca= DriverManager.getConnection ("jdbc:oracle:thin:@dbserver:1521:infs", "manzur", "manzur");
 sqlStatement = sqlconn.createStatement ();
 rset = sqlStatement.executeQuery ("select * from customers");
 while (rset.next ()){
 String CUSTOMERID=rset.getObject(1).toString();
 String CUSTOMERNAME =rset.getObject(2).toString();
 String CUSTOMERCITY =rset.getObject(3).toString();
String CUSTOMERPHONE =rset.getObject(4).toString();
 //String map=rset.getObject(4).toString();
 //String region=rset.getObject(5).toString();
 //System.out.println (id + "\t" + name + "\t" + loc );
 outputArea.append(CUSTOMERID + "\t" + CUSTOMERNAME + "\t" + CUSTOMERCITY + "\t" + CUSTOMERPHONE + "\n" );
 } // end while
 }// end try
 catch (SQLException ex)
 System.out.println("SQLException:" + ex.getMessage() + " ");
 }// catch
}// action performed
} // anonymous inner class
);// end addActionListener
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 // anonymous inner class
new ActionListener()
public void actionPerformed(ActionEvent event)
try{
 Statement sqlStatement = null;
ResultSet rtbookset = null;
// create statement
sqlStatement = sqlconn.createStatement();
int CUSTOMERID = Integer.parseInt(field1.getText());
String CUSTOMERNAME = field2.getText();
 String CUSTOMERCITY = field3.getText();
int CUSTOMERPHONE = Integer.parseInt(field4.getText());
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 String insertquery = "INSERT INTO CUSTOMERS VALUES("
 + CUSTOMERID + "," + "'" + CUSTOMERNAME + "'," + "'" + CUSTOMERCITY + "'," + CUSTOMERPHONE + ")";
 // execute the query
 sqlStatement.executeQuery(insertquery);
 // clear the textfields
 field1.setText("");
 field2.setText("");
 field3.setText("");
field4.setText("");
 JOptionPane.showMessageDialog(null,"Record added");
}// try
catch(SQLException ex)
 System.out.println("Record exists :" + ex.getMessage() + " ");
 }// catch
}// actionPerformed
}// anonymous inner class
//--------- method to use buttonUpdate event--------------------
buttonUpdate.addActionListener(
//anonymous class
new ActionListener()
 public void actionPerformed(ActionEvent event)
 //Connection sqlconn = null;
 Statement sqlStatement = null;
 ResultSet rset = null;
int CUSTOMER_ID = Integer.parseInt(field1.getText());
 try{
 //int CUSTOMER_ID = Integer.parseInt(field1.getText());
 //String d_name = field2.getText();
 //String d_loc = field3.getText();
 //DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
 //sqlca= DriverManager.getConnection ("jdbc:oracle:thin:@dbserver:1521:infs", "manzur", "manzur");
 sqlStatement = sqlconn.createStatement ();
 rset = sqlStatement.executeQuery ("select * from CUSTOMERS where CUSTOMER_ID =" + CUSTOMER_ID);
 rset.next ();
 //int id=rset.getInt("DEPTNO");
 String CUSTOMERID = rset.getObject(1).toString();
 String CUSTOMERNAME=rset.getString("CUSTOMER_NAME");
 String CUSTOMERCITY=rset.getString("CUSTOMER_CITY");
String CUSTOMERPHONE=rset.getString("CUSTOMER_PHONE");
field1.setText(CUSTOMERID);
 field2.setText(CUSTOMERNAME);
 field3.setText(CUSTOMERCITY);
field4.setText(CUSTOMERPHONE);
//buttonUpdate.setEnabled(false);
//buttonModifyRecord.setEnabled(true);
//rset.close();
 }// end try
 catch (SQLException ex)
 JOptionPane.showMessageDialog(null,"No Record found with CUSTOMER ID :" + CUSTOMER_ID );
 //System.out.println("SQLException:No record found" + ex.getMessage() + " ");
 }// catch
}// action performed
} // anonymous inner class
);// end addActionListener
//---------Method to modify record------------------------------------
buttonModifyRecord.addActionListener(
//anonymous class
new ActionListener()
 public void actionPerformed(ActionEvent event)
 //Connection sqlconn = null;
 Statement sqlStatement = null;
 ResultSet rset = null;
 try{
 //int dept_no = Integer.parseInt(field1.getText());
 //String d_name = field2.getText();
 //String d_loc = field3.getText();
 //DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
 //sqlca= DriverManager.getConnection ("jdbc:oracle:thin:@dbserver:1521:infs", "manzur", "manzur");
 sqlStatement = sqlconn.createStatement ();
int CUSTOMERID = Integer.parseInt(field1.getText());
 String CUSTOMERNAME = field2.getText();
 String CUSTOMERCITY = field3.getText();
int CUSTOMERPHONE = Integer.parseInt(field4.getText());
 String updatequery = "UPDATE CUSTOMERS SET CUSTOMER_NAME = " + "'" + CUSTOMERNAME + "',"
+ " CUSTOMER_CITY = " + "'" + CUSTOMERCITY + "'," + " CUSTOMER_PHONE = " + CUSTOMERPHONE
+ " Where CUSTOMER_ID = " + CUSTOMERID;
 // execute the query
 sqlStatement.executeQuery(updatequery);
 // clear the textfields
 field1.setText("");
 field2.setText("");
 field3.setText("");
field4.setText("");
 JOptionPane.showMessageDialog(null,"Record modified");
//buttonUpdate.setEnabled(true);
//buttonModifyRecord.setEnabled(false);
 }// end try
 catch (SQLException ex)
 System.out.println("SQLException:" + ex.getMessage() + " ");
 }// catch
}// action performed
} // anonymous inner class
);// end addActionListener
//---------Method to modify record------------------------------------
buttonDelete.addActionListener(
//anonymous class
new ActionListener()
 public void actionPerformed(ActionEvent event)
 //Connection sqlca = null;
 Statement sqlStatement = null;
 ResultSet rset = null;
 try{
 //DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
 //sqlca= DriverManager.getConnection ("jdbc:oracle:thin:@dbserver:1521:infs", "manzur", "manzur");
 sqlStatement = sqlconn.createStatement ();
int CUSTOMERID = Integer.parseInt(field1.getText());
 //String d_name = field2.getText();
 //String d_loc = field3.getText();
 String deletequery = "DELETE from CUSTOMERS "
+ " Where CUSTOMER_ID = " + CUSTOMERID;
 // execute the query
 sqlStatement.executeQuery(deletequery);
 // clear the textfields
 field1.setText("");
 field2.setText("");
 field3.setText("");
field4.setText("");
 JOptionPane.showMessageDialog(null,"Record Deleted");
//buttonUpdate.setEnabled(true);
//buttonModifyRecord.setEnabled(false);
 }// end try
 catch (SQLException ex)
 System.out.println("SQLException:" + ex.getMessage() + " ");
 }// catch
}// action performed
} // anonymous inner class
);// end addActionListener
// specify the size of the window
setSize(800,500);
show();
}// constructor
public static void main(String args[]) throws IOException{
OracleJavaCustomerWindow application = new OracleJavaCustomerWindow();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}// main
} // class OracleJavaWindow
// exceptions classes
// inserFailedException is a general exception for
// SQL insert problems
/*class insertFailedException extends SQLException
public insertFailedException(String reason)
 super(reason);
public insertFailedException(String reason)
 super();
}*/

Sorry guys here is the correction of details i have provided
the Error message tells me that
package oracle.jdbc.driver does not exist
and the folder I used to do Mounting SystemFile for was
C:\Oracle\jdbc\lib\classes12

What the Enviroment required for java databases programs?

Hi guys
What the enviroment required for java databases programs?
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do I need Jdeveloper platform ?

What the enviroment required for java databases programs?What do you mean by "environment"?
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%

Re: Java Database

Hello,
I'll like some advice on the topic mentioned above. I'm a beginner of java programming and have elementry knowledge about java. I'll like to know how is it possible to input the list of data in Excel format into Java Database Connectivity and how am I able to extract out the info. that I'll need. Like say the columns/field on designation and name. How am I able to extract the data and change it like to delete or edit the info.??
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http://www.javaworld.com
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pe1adm> java -fullversion
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Please note with the SAPINST we are using currently, the exports of remaining systems in EP & other solutions like ECC,CR,SRM,XI,BI are successfull.We are having this issue only in PE1.Looks like some bug in code.So request the experts in this forum to please take a look at it & provide me with solution if any of you have faced the similar situation.
Thanks & regards,
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Thank you for your reply Subhash.The below is the last entry in jload.log.It is at EP_ATTR_HEADERS.While doing the Java export,we asked our DBA to monitor to find out any errors at DB side.He monitored and said that no deadlocks or no infinite loops are found.Also he said that he cannot create index for that too because it is trying to do select *.In our first 2 or 3 attempts it used to hang at CA_PRODUCTS meta data exported,CA_PROPERTY meta data exported.Now here.Our DBA said that EP_ATTR_HEADERS has 1.4M rows.We tried to bounce the entire system also,but no luck.We have the same issue.Peculiar thing is we dont see any errors or warnings in the logs.
23.06.11 09:54:21 com.sap.inst.jload.Jload dbExport
INFO: EP_ATTR_DEFS exported (6 rows)
23.06.11 09:54:21 com.sap.inst.jload.Jload dbExport
INFO: EP_ATTR_HEADERS meta data exported
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Thanks & regards,
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If anyone knows of other free Java databases that would be appreciated too.
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"My karma ran over your dogma." - Anon

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Hi,
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Here is what I did:
I read other threads and checked from the SAP Management Console if the DB is online. It is online and the DB is not full.But the log and Data states are shown as 0%.
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I couldn't find any other threads with suggestions which could be of help to my issue.
I am using windows vista home premium.I get some errors during installation but not during step 18. so I am not sure whether to consider those errors for this issue.
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PHASE 2007-09-22 15:40:18
Prepare the installation program.
WARNING[E] 2007-09-22 15:43:05
Error converting from service name=sapmsJ2E/protocol=tcp to port number. SAPRETURN=12
WARNING[E] 2007-09-22 15:44:47
Error converting from service name=sapmsJ2E/protocol=tcp to port number. SAPRETURN=12
WARNING[E] 2007-09-22 15:45:50
Error converting from service name=sapmsJ2E/protocol=tcp to port number. SAPRETURN=12
ERROR 2007-09-22 15:50:42
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) in execution of a 'OpenService' function, line (255), with parameter (SAPOsCol).
ERROR 2007-09-22 15:51:12
FSL-06002 Error 1060 (The specified service does not exist as an installed service.
) in execution of a 'OpenService' function, line (255), with parameter (SAPJ2E_01).
ERROR 2007-09-22 15:51:12
FSL-06002 Error 1060 (The specified service does not exist as an installed service.
) in execution of a 'OpenService' function, line (255), with parameter (SAPJ2E_01).
ERROR 2007-09-22 15:51:12
FSL-06002 Error 1060 (The specified service does not exist as an installed service.
) in execution of a 'OpenService' function, line (255), with parameter (SAPJ2E_00).
ERROR 2007-09-22 15:51:12
FSL-06002 Error 1060 (The specified service does not exist as an installed service.
) in execution of a 'OpenService' function, line (255), with parameter (SAPJ2E_00).
WARNING 2007-09-22 15:52:11
While copying files to 'C:\usr\sap\J2E\SCS01\exe': source file 'C:\usr\sap\J2E\SYS\exe\run/icudt26.dll' not found.
WARNING 2007-09-22 15:52:12
While copying files to 'C:\usr\sap\J2E\JC00\exe': source file 'C:\usr\sap\J2E\SYS\exe\run/icudt26.dll' not found.
ERROR 2007-09-22 15:52:31
FSL-06002 Error 1060 (The specified service does not exist as an installed service.
) in execution of a 'OpenService' function, line (255), with parameter (SAPOsCol).
WARNING 2007-09-22 15:54:12
Execution of the command "C:\usr\sap/J2E/JC00/igs/bin/igswd.exe 'C:\usr\sap\J2E\JC00\igs' '-c' '-tracelevel=1' '-mux=Karthik-PC,40000' '-listenerhttp=40080' '-portwatcher=40001' '-portwatcher=40002'" finished with return code 1. Output:
PHASE 2007-09-22 16:03:03
Deploying SDAs (using SDM and SAP J2EE Engine).
PHASE 2007-09-22 16:03:22
Deploying SDAs (using SDM and SAP J2EE Engine).
PHASE 2007-09-22 16:04:29
Deploying SDAs (using SDM and SAP J2EE Engine).
PHASE 2007-09-22 16:05:18
Deploying SDAs (using SDM and SAP J2EE Engine).
PHASE 2007-09-22 16:05:59
SAP J2EE Engine
PHASE 2007-09-22 16:06:09
JLoad Run
I have spent a lot of time to have this installed. Please somebody help.
Thanks
Karthik

Hi Raja and Anatoliy Misyura ,
Thanks a lot for taking time to reply to my issue.
1)I completely unistalled the previous version by running clearner.exe and stopping the services,removing sapdb folder etc.,
2)Then I disabled my antivirus,firewall etc.,
3)Installed jdk 1.4.2_11(after removed the previously tried version 1.4.2_12
4)Ran the SAPInst installer
But unfortunately still the installer stops at the same step!
Don't know what's going wrong.....
Raja- Can you tell me what is the windows OS version you have? Mine is home premium.
Thanks
Karthik
Can you guys let me know if you have any other suggestions

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Hi,
JDBC is the Acronym of Java Database Connectivity - Yes / No?
I am little bit confused. I got this question in an Inteview.
I support yes. But some of the compitiors say no.
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Really? Even Sun contradicts themselves here:
(2002) http://java.sun.com/javase/6/docs/technotes/guides/jdbc/
and (more importantly) here:
http://java.sun.com/docs/glossary.html#JDBC
although here:
(2001) http://java.sun.com/j2se/1.4.2/docs/guide/jdbc/getstart/intro.html
I think it is simply silly for the latter to state that "JDBC is the trademarked name and is not an acronym" -- Oh really? JDBC doesn't stand for anything? It is all caps just because it is a trademark then? hmmm.
I'm certain the real answer of what it stands for may have been lost long ago. However, I doubt that the interviewer meant the question to be a trick and was looking for "Java DataBase Connectivity"
For every instance that you find that it doesn't stand for anything, I can show you 2 instances (from Sun or an employee) where they use "Java Database Connectivity (JDBC)".
P.S. Ryan Craig may be the final authority on this...

How we build Java Database Connectivity for Oracle 8i Database

Can any one send me a sample code for Java Database Connectivity for Oracle 8i Database
it will be a grat help
Thanks & Regards
Rasika

You don't need a DSN if you use Oracle's JDBC driver.
You didn't read ANY of the previous replies. What makes you think this one willk help? Or any instruction, for that matter?
Sounds like you just want someone to give it to you. OK, I'll bite, but you have to figure out the rest:
import java.sql.*;
import java.util.*;
* Command line app that allows a user to connect with a database and
* execute any valid SQL against it
public class DataConnection
 public static final String DEFAULT_DRIVER = "sun.jdbc.odbc.JdbcOdbcDriver";
 public static final String DEFAULT_URL = "jdbc:odbc:DRIVER={Microsoft Access Driver (*.mdb)};DBQ=c:\\Edu\\Java\\Forum\\DataConnection.mdb";
 public static final String DEFAULT_USERNAME = "admin";
 public static final String DEFAULT_PASSWORD = "";
 public static final String DEFAULT_DRIVER = "com.mysql.jdbc.Driver";
 public static final String DEFAULT_URL = "jdbc:mysql://localhost:3306/hibernate";
 public static final String DEFAULT_USERNAME = "admin";
 public static final String DEFAULT_PASSWORD = "";
 /** Database connection */
 private Connection connection;
 * Driver for the DataConnection
 * @param command line arguments
 * <ol start='0'>
 * <li>SQL query string</li>
 * <li>JDBC driver class</li>
 * <li>database URL</li>
 * <li>username</li>
 * <li>password</li>
 * </ol>
 public static void main(String [] args)
 DataConnection db = null;
 try
 if (args.length > 0)
 String sql = args[0];
 String driver = ((args.length > 1) ? args[1] : DEFAULT_DRIVER);
 String url = ((args.length > 2) ? args[2] : DEFAULT_URL);
 String username = ((args.length > 3) ? args[3] : DEFAULT_USERNAME);
 String password = ((args.length > 4) ? args[4] : DEFAULT_PASSWORD);
 System.out.println("sql : " + sql);
 System.out.println("driver : " + driver);
 System.out.println("url : " + url);
 System.out.println("username: " + username);
 System.out.println("password: " + password);
 db = new DataConnection(driver, url, username, password);
 System.out.println("Connection established");
 Object result = db.executeSQL(sql);
 System.out.println(result);
 else
 System.out.println("Usage: db.DataConnection <sql> <driver> <url> <username> <password>");
 catch (SQLException e)
 System.err.println("SQL error: " + e.getErrorCode());
 System.err.println("SQL state: " + e.getSQLState());
 e.printStackTrace(System.err);
 catch (Exception e)
 e.printStackTrace(System.err);
 finally
 if (db != null)
 db.close();
 db = null;
 * Create a DataConnection
 * @throws SQLException if the database connection fails
 * @throws ClassNotFoundException if the driver class can't be loaded
 public DataConnection() throws SQLException,ClassNotFoundException
 this(DEFAULT_DRIVER, DEFAULT_URL, DEFAULT_USERNAME, DEFAULT_PASSWORD);
 * Create a DataConnection
 * @throws SQLException if the database connection fails
 * @throws ClassNotFoundException if the driver class can't be loaded
 public DataConnection(final String driver,
 final String url,
 final String username,
 final String password)
 throws SQLException,ClassNotFoundException
 Class.forName(driver);
 this.connection = DriverManager.getConnection(url, username, password);
 * Get Driver properties
 * @param database URL
 * @return list of driver properties
 * @throws SQLException if the query fails
 public List getDriverProperties(final String url)
 throws SQLException
 List driverProperties = new ArrayList();
 Driver driver = DriverManager.getDriver(url);
 if (driver != null)
 DriverPropertyInfo[] info = driver.getPropertyInfo(url, null);
 if (info != null)
 driverProperties = Arrays.asList(info);
 return driverProperties;
 * Clean up the connection
 public void close()
 close(this.connection);
 * Execute ANY SQL statement
 * @param SQL statement to execute
 * @returns list of row values if a ResultSet is returned,
 * OR an altered row count object if not
 * @throws SQLException if the query fails
 public Object executeSQL(final String sql) throws SQLException
 Object returnValue;
 Statement statement = null;
 ResultSet rs = null;
 try
 statement = this.connection.createStatement();
 boolean hasResultSet = statement.execute(sql);
 if (hasResultSet)
 rs = statement.getResultSet();
 ResultSetMetaData meta = rs.getMetaData();
 int numColumns = meta.getColumnCount();
 List rows = new ArrayList();
 while (rs.next())
 Map thisRow = new LinkedHashMap();
 for (int i = 1; i <= numColumns; ++i)
 String columnName = meta.getColumnName(i);
 Object value = rs.getObject(columnName);
 thisRow.put(columnName, value);
 rows.add(thisRow);
 returnValue = rows;
 else
 int updateCount = statement.getUpdateCount();
 returnValue = new Integer(updateCount);
 finally
 close(rs);
 close(statement);
 return returnValue;
 * Close a database connection
 * @param connection to close
 public static final void close(Connection connection)
 try
 if (connection != null)
 connection.close();
 connection = null;
 catch (SQLException e)
 e.printStackTrace();
 * Close a statement
 * @param statement to close
 public static final void close(Statement statement)
 try
 if (statement != null)
 statement.close();
 statement = null;
 catch (SQLException e)
 e.printStackTrace();
 * Close a result set
 * @param rs to close
 public static final void close(ResultSet rs)
 try
 if (rs != null)
 rs.close();
 rs = null;
 catch (SQLException e)
 e.printStackTrace();
 * Close a database connection and statement
 * @param connection to close
 * @param statement to close
 public static final void close(Connection connection, Statement statement)
 close(statement);
 close(connection);
 * Close a database connection, statement, and result set
 * @param connection to close
 * @param statement to close
 * @param rs to close
 public static final void close(Connection connection,
 Statement statement,
 ResultSet rs)
 close(rs);
 close(statement);
 close(connection);
}%

Login codes using java database (validates with Microsoft Access File)

hi all pro-programmer, can you show me the code to login with the username and password using java database. When the user enters the username and password in the login page then it will go to the requested page. may i know how to do it?

no one will give you complete code.
i'll lay out the pieces for you, though:
(1) start with a User object. give it username and password attributes.
(2) write a UserDAO interface with CRUD operations for a User object.
(3) write a UserDAOImpl for your Microsoft Access database
(4) write an AuthenticationService interface
(5) write an implementation of the AuthenicationService that works with the UserDAO to authorize a User.
Use a servlet to accept request from your login page and pass it off to the service. Voila.
PS - Here's skeleton to start with. UI, servlet, and controller are your responsibility:
package model;
public class User implements Serializable
    private String username;
    private String password;
    public User(String u, String p)
        this.username = u;
        this.password = p;
    public String getUsername() { return username; }
    public String getPassword() { return password; }
public interface UserDAO
    public User findByUsername(String username);
    public void saveOrUpdate(User user);
    public void delete(User user);
public class UserDAOImpl implements UserDAO
    private Connection connection;
    public UserDAOImpl(Connection connection)
        this.connection = connection;
    public User findByUsername(String username)
        String password = "";
        // logic for querying the database for a User
        return new User(username, password);
    public void saveOrUpdate(User user)
        // save or update a User
    public void delete(User user)
        // delete a User
public interface AuthenticationService
    public boolean isAuthorized(String username);
public class AuthenticationServiceImpl implements AuthenticationService
    private UserDAO userDAO;
    public AuthenticationServiceImpl()
        // Create a database connection here and the UserDAO, too.
    public boolean isAuthorized(String username)
        boolean isAuthorized = false;
        // Add logic to do the database query and decide if the username is authorized
        return isAuthorized;
}

Java.io.WriteAbortedException: writing aborted; java.io.NotSerializableEx

anyone can explain this
i want to modify a value and hits this problem

[20070828 10:58:27:125] E [AppLog/MI/API/Services ] java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: com.sap.ip.me.api.services.MEResourceBundle
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: com.sap.ip.me.api.services.MEResourceBundle
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1278)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
 at com.sap.ip.me.api.services.IOUtils.readSerializedObjectFromFile(IOUtils.java:934)
 at com.sap.ip.me.api.services.IOUtils.readHashtableFromDirectory(IOUtils.java:835)
 at com.sap.ip.me.sync.InboundProcessorRegistryImpl.<init>(InboundProcessorRegistryImpl.java:66)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
 at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
 at java.lang.Class.newInstance0(Class.java:308)
 at java.lang.Class.newInstance(Class.java:261)
 at com.sap.ip.me.api.conf.Configuration.createInstanceForType(Configuration.java:512)
 at com.sap.ip.me.api.conf.Configuration.getSingletonInstanceForType(Configuration.java:457)
 at com.sap.ip.me.api.sync.InboundProcessorRegistry.<clinit>(InboundProcessorRegistry.java:78)
 at com.sap.ip.me.smartsync.core.SmartSyncRuntimeManager.initializeSmartSyncFramework(SmartSyncRuntimeManager.java:132)
 at com.sap.ip.me.core.FrameworkInitializer.initSmartSync(FrameworkInitializer.java:883)
 at com.sap.ip.me.core.FrameworkInitializer.initializeFramework(FrameworkInitializer.java:367)
 at com.sap.ip.me.core.FrameworkInitializer.main(FrameworkInitializer.java:126)
 at com.sap.ip.me.mdk.api.runtime.Start.startME(Start.java:139)
 at com.sap.ip.me.mdk.api.runtime.Start.main(Start.java:46)
Caused by: java.io.NotSerializableException: com.sap.ip.me.api.services.MEResourceBundle
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
 at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
 at com.sap.ip.me.api.services.IOUtils.serializeObjectToFile(IOUtils.java:875)
 at com.sap.ip.me.api.services.IOUtils.saveHashtableToDirectory(IOUtils.java:801)
 at com.sap.ip.me.sync.InboundProcessorRegistryImpl.register(InboundProcessorRegistryImpl.java:285)
 at com.sap.ip.mi.systemnews.NewsImpl.create(NewsImpl.java:313)
 at com.sap.ip.mi.systemnews.StartListener.userLoggedOn(StartListener.java:24)
 at com.sap.ip.me.core.UserManagerImpl.fireLogon(UserManagerImpl.java:2283)
 at com.sap.ip.me.core.UserManagerImpl.logOnUser(UserManagerImpl.java:766)
 at com.sap.ip.me.core.UserManagerImpl.logOnUser(UserManagerImpl.java:744)
 at com.sap.ip.me.apps.jsp.LoginServlet.doHandleEvent(LoginServlet.java:274)
 at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doGetNotThreadSafe(AbstractMEHttpServlet.java:347)
 at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doGet(AbstractMEHttpServlet.java:689)
 at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doPost(AbstractMEHttpServlet.java:706)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
 at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.service(AbstractMEHttpServlet.java:313)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
 at org.apache.tomcat.core.Handler.service(Handler.java:287)
 at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
 at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:806)
 at org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
 at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
 at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
 at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
 at java.lang.Thread.run(Thread.java:534)
[20070828 10:58:27:968] E [AppLog/MI/API/Services ] Problems while saving C:\Program Files\SAP Mobile Infrastructure\sync\inboundProcessors\1.value
java.io.NotSerializableException: com.sap.ip.me.api.services.MEResourceBundle
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
 at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
 at com.sap.ip.me.api.services.IOUtils.serializeObjectToFile(IOUtils.java:875)
 at com.sap.ip.me.api.services.IOUtils.saveHashtableToDirectory(IOUtils.java:801)
 at com.sap.ip.me.sync.InboundProcessorRegistryImpl.register(InboundProcessorRegistryImpl.java:285)
 at com.sap.ip.me.core.ApplicationManager.registerInboundProcessors(ApplicationManager.java:198)
 at com.sap.ip.me.core.FrameworkInitializer.initializeFramework(FrameworkInitializer.java:379)
 at com.sap.ip.me.core.FrameworkInitializer.main(FrameworkInitializer.java:126)
 at com.sap.ip.me.mdk.api.runtime.Start.startME(Start.java:139)
 at com.sap.ip.me.mdk.api.runtime.Start.main(Start.java:46)
[20070828 10:58:28:078] E [AppLog/MI/API/Services ] Problems while saving C:\Program Files\SAP Mobile Infrastructure\sync\inboundProcessors\1.value
java.io.NotSerializableException: com.sap.ip.me.api.services.MEResourceBundle
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
 at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
 at com.sap.ip.me.api.services.IOUtils.serializeObjectToFile(IOUtils.java:875)
 at com.sap.ip.me.api.services.IOUtils.saveHashtableToDirectory(IOUtils.java:801)
 at com.sap.ip.me.sync.InboundProcessorRegistryImpl.register(InboundProcessorRegistryImpl.java:285)
 at com.sap.ip.me.core.ApplicationManager.registerInboundProcessors(ApplicationManager.java:200)
 at com.sap.ip.me.core.FrameworkInitializer.initializeFramework(FrameworkInitializer.java:379)
 at com.sap.ip.me.core.FrameworkInitializer.main(FrameworkInitializer.java:126)
 at com.sap.ip.me.mdk.api.runtime.Start.startME(Start.java:139)
 at com.sap.ip.me.mdk.api.runtime.Start.main(Start.java:46)
[20070828 10:58:28:140] E [AppLog/MI/API/Services ] Problems while saving C:\Program Files\SAP Mobile Infrastructure\sync\inboundProcessors\1.value
java.io.NotSerializableException: com.sap.ip.me.api.services.MEResourceBundle
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
 at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
 at com.sap.ip.me.api.services.IOUtils.serializeObjectToFile(IOUtils.java:875)
 at com.sap.ip.me.api.services.IOUtils.saveHashtableToDirectory(IOUtils.java:801)
 at com.sap.ip.me.sync.InboundProcessorRegistryImpl.register(InboundProcessorRegistryImpl.java:285)
 at com.sap.ip.me.core.FrameworkInitializer.initializeFramework(FrameworkInitializer.java:382)
 at com.sap.ip.me.core.FrameworkInitializer.main(FrameworkInitializer.java:126)
 at com.sap.ip.me.mdk.api.runtime.Start.startME(Start.java:139)
 at com.sap.ip.me.mdk.api.runtime.Start.main(Start.java:46)
[20070828 10:58:36:781] D [MI/API/Sync ] SyncEventListener com.sap.ip.me.core.StatusUpdater@b1cc87 was registered for key com.sap.ip.me.core.StatusUpdater/MI574f4e32
[20070828 10:58:36:781] D [MI/Sync ] Register inbound processor com.sap.ip.mi.systemnews.InboundListener for method SYSTEMNEWS
[20070828 10:58:36:812] E [AppLog/MI/API/Services ] Problems while saving C:\Program Files\SAP Mobile Infrastructure\sync\inboundProcessors\1.value
java.io.NotSerializableException: com.sap.ip.me.api.services.MEResourceBundle
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
 at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
 at com.sap.ip.me.api.services.IOUtils.serializeObjectToFile(IOUtils.java:875)
 at com.sap.ip.me.api.services.IOUtils.saveHashtableToDirectory(IOUtils.java:801)
 at com.sap.ip.me.sync.InboundProcessorRegistryImpl.register(InboundProcessorRegistryImpl.java:285)
 at com.sap.ip.mi.systemnews.NewsImpl.create(NewsImpl.java:313)
 at com.sap.ip.mi.systemnews.StartListener.userLoggedOn(StartListener.java:24)
 at com.sap.ip.me.core.UserManagerImpl.fireLogon(UserManagerImpl.java:2283)
 at com.sap.ip.me.core.UserManagerImpl.logOnUser(UserManagerImpl.java:766)
 at com.sap.ip.me.core.UserManagerImpl.logOnUser(UserManagerImpl.java:744)
 at com.sap.ip.me.apps.jsp.LoginServlet.doHandleEvent(LoginServlet.java:274)
 at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doGetNotThreadSafe(AbstractMEHttpServlet.java:347)
 at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doGet(AbstractMEHttpServlet.java:689)
 at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doPost(AbstractMEHttpServlet.java:706)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
 at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.service(AbstractMEHttpServlet.java:313)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
 at org.apache.tomcat.core.Handler.service(Handler.java:287)
 at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
 at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:806)
 at org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
 at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
 at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
 at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)

MI framework tries to serialize all inbound listeners during the registration.
However, com.sap.ip.mi.systemnews.InboundListener seems to have a member
of type com.sap.ip.me.api.services.MEResourceBundle which is not Serializable.
basically this doesn't do any harm and you can just ignore this. In the previous MI
SP level, I think we have this observer serialization exception ignored in the code;
but it seems that implementation been changed...
regards
jo

Java Database Authentication

Hi :
I work on web application depends on EJB 3.0 and ADF Faces.
I don't want to use basic form authentication and authorizations for users...!!??
I heard about Java Database authentication and authorization...??
How can I use it...?? somebody helps me please...!!!
Send me any tutorial or anything related with it..
Thanks

Hi,
and the database authentication uses JAAS LoginModules with basic or form based authentication. See the oC4J Security guide
Frank

Writing a Java Database

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