Regarding problem of database connectivity of JApplet

Below written code gives the error "JAVA.Lang.RuntimePermissionaccessClasslnPackage.sun.jdbc.odbc".
import javax.swing.*;
import java.sql.*;
import java.awt.event.*;
import java.awt.*;
public class appletDatabase extends JApplet implements ActionListener {
JLabel l1;
JLabel l2;
JLabel l3;
JTextField tf1;
JPasswordField tf2;
JButton btn;
Connection cn;
Statement st;
String hostname;
public void init() {
//hostname = "localhost";
l1 = new JLabel("User Name: ");
l2 = new JLabel(" Password: ");
l3 = new JLabel(" ");
tf1 = new JTextField(20);
tf2 = new JPasswordField(20);
btn = new JButton("Sign in");
Container c = getContentPane();
c.setLayout(new FlowLayout(FlowLayout.LEFT));
c.add(l1);
c.add(tf1);
c.add(l2);
c.add(tf2);
c.add(btn);
c.add(l3);
btn.addActionListener(this);
setSize(300,300);
setVisible(true);
public void actionPerformed(ActionEvent e) {
if (e.getSource()==btn)
     JOptionPane.showMessageDialog(null,"btn click");
     check();
     JOptionPane.showMessageDialog(null,"success");
public void check() {
String query="SELECT * from TBJAVA";
try {
     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
     cn = DriverManager.getConnection("jdbc:odbc:Temp","trg123","training");
     st = cn.createStatement();
     ResultSet rs = st.executeQuery(query);}
/*if (!(rs==null))
if (rs.next())
b = true;
rs.close();
st.close();
cn.close();
/* catch (SQLException e1) {
          e1.printStackTrace();
          JOptionPane.showMessageDialog(null,"error in sql exception");
catch (ClassNotFoundException e1) {
          e1.printStackTrace();
          JOptionPane.showMessageDialog(null,"error in class not founf");
     catch (Exception e1) {
          e1.printStackTrace();
          JOptionPane.showMessageDialog(null,"error in exception"+e1.getMessage());
corresponding HTML code is given below:
<html>
<head>
</head>
<body><applet code="appletDatabase" width =400 height =400></applet>
</body>
</html>
Please help
regards
kamal preet

Please use code tags when posting code
Applet sandbox do not allow you to access local system respurces unless the applet is signed.
jdbc:odbc bridge always connect to the ODBC interface in the local system.

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Code for the 1st JFrame
* one.java
* Created on July 25, 2008, 9:55 PM
package prac1;
import prac2.two;
* @author Administrator
public class one extends javax.swing.JFrame {
    /** Creates new form one */
    public one() {
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        jButton1 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jButton1.setText("Next");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
        jLabel1.setText("FIRST");
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap(213, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(105, 105, 105))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addGap(136, 136, 136))))
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(59, 59, 59)
                .addComponent(jLabel1)
                .addGap(142, 142, 142)
                .addComponent(jButton1)
                .addContainerGap(62, Short.MAX_VALUE))
        pack();
    }// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
new two().setVisible(true);
dispose();
    * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new one().setVisible(true);
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    // End of variables declaration
Code for the 2nd JFrame
* two.java
* Created on July 25, 2008, 9:56 PM
package prac2;
import prac3.three;
* @author Administrator
public class two extends javax.swing.JFrame {
    /** Creates new form two */
    public two() {
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        jButton1 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jButton1.setText("Next");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
        jLabel1.setText("SECOND");
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap(209, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(116, 116, 116))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addGap(139, 139, 139))))
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(43, 43, 43)
                .addComponent(jLabel1)
                .addGap(146, 146, 146)
                .addComponent(jButton1)
                .addContainerGap(74, Short.MAX_VALUE))
        pack();
    }// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
new three().setVisible(true);
dispose();
    * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new two().setVisible(true);
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    // End of variables declaration
Code for the 3rd JFrame
* two.java
* Created on July 25, 2008, 9:56 PM
package prac2;
import prac3.three;
* @author Administrator
public class two extends javax.swing.JFrame {
    /** Creates new form two */
    public two() {
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        jButton1 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jButton1.setText("Next");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
        jLabel1.setText("SECOND");
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap(209, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(116, 116, 116))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addGap(139, 139, 139))))
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(43, 43, 43)
                .addComponent(jLabel1)
                .addGap(146, 146, 146)
                .addComponent(jButton1)
                .addContainerGap(74, Short.MAX_VALUE))
        pack();
    }// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
new three().setVisible(true);
dispose();
    * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new two().setVisible(true);
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    // End of variables declaration
Errors which I receive in the output screen
Exception in thread "AWT-EventQueue-0" Local Exception Stack:
Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.DatabaseException
Internal Exception: java.sql.SQLSyntaxErrorException: Syntax error: Encountered "1" at line 1, column 80.
Error Code: -1
Call: SELECT Scholar_no, CARD_A, CARD_B, CARD_C, Grad_Year, CARD_D, Branch, BookBank 1, Name, BookBank 2 FROM LIB.student
Query: ReportQuery(prac3.Student)
at oracle.toplink.essentials.exceptions.DatabaseException.sqlException(DatabaseException.java:319)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:566)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:452)
at oracle.toplink.essentials.threetier.ServerSession.executeCall(ServerSession.java:473)
at oracle.toplink.essentials.internal.queryframework.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:228)
at oracle.toplink.essentials.internal.queryframework.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:214)
at oracle.toplink.essentials.internal.queryframework.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:285)
at oracle.toplink.essentials.internal.queryframework.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:615)
at oracle.toplink.essentials.internal.queryframework.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2416)
at oracle.toplink.essentials.internal.queryframework.ExpressionQueryMechanism.selectAllReportQueryRows(ExpressionQueryMechanism.java:2382)
at oracle.toplink.essentials.queryframework.ReportQuery.executeDatabaseQuery(ReportQuery.java:802)
at oracle.toplink.essentials.queryframework.DatabaseQuery.execute(DatabaseQuery.java:628)
at oracle.toplink.essentials.queryframework.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:692)
at oracle.toplink.essentials.queryframework.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:746)
at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2233)
at oracle.toplink.essentials.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:952)
at oracle.toplink.essentials.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:924)
at oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:367)
at oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.getResultList(EJBQueryImpl.java:478)
at prac3.three.initComponents(three.java:32)
at prac3.three.<init>(three.java:17)
at prac2.two.jButton1ActionPerformed(two.java:71)
at prac2.two.access$000(two.java:13)
at prac2.two$1.actionPerformed(two.java:37)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6041)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5806)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Caused by: java.sql.SQLSyntaxErrorException: Syntax error: Encountered "1" at line 1, column 80.
at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
at org.apache.derby.client.am.Connection.prepareStatement(Unknown Source)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.prepareStatement(DatabaseAccessor.java:1162)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseCall.prepareStatement(DatabaseCall.java:612)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:485)
... 47 more
Caused by: org.apache.derby.client.am.SqlException: Syntax error: Encountered "1" at line 1, column 80.
at org.apache.derby.client.am.Statement.completeSqlca(Unknown Source)
at org.apache.derby.client.net.NetStatementReply.parsePrepareError(Unknown Source)
at org.apache.derby.client.net.NetStatementReply.parsePRPSQLSTTreply(Unknown Source)
at org.apache.derby.client.net.NetStatementReply.readPrepareDescribeOutput(Unknown Source)
at org.apache.derby.client.net.StatementReply.readPrepareDescribeOutput(Unknown Source)
at org.apache.derby.client.net.NetStatement.readPrepareDescribeOutput_(Unknown Source)
at org.apache.derby.client.am.Statement.readPrepareDescribeOutput(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.readPrepareDescribeInputOutput(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.flowPrepareDescribeInputOutput(Unknown Source)
at org.apache.derby.client.am.PreparedStatement.prepare(Unknown Source)
at org.apache.derby.client.am.Connection.prepareStatementX(Unknown Source)
... 51 more

Hi here is the output which u requested.
Services Summary...
Service "Orcl" has 2 instance(s).
Instance "Orcl", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:3 refused:0
LOCAL SERVER
Instance "orcl", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:1 refused:0 state:ready
LOCAL SERVER
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Handler(s):
"D000" established:0 refused:0 current:0 max:1002 state:ready
DISPATCHER <machine: SANJAY_KAUSHAL, pid: 2596>
(ADDRESS=(PROTOCOL=tcp)(HOST=Sanjay_Kaushal)(PORT=1028))
The command completed successfully

A problem about database connection

What's the advantages and disadvantages of create each JDBC connection in the jspInit ( ) and close it in jspDestroy ( ) for every JSP script compare with from the connection pool.
THANKS
Edited by: Cryil on Nov 14, 2007 11:21 PM

jiju wrote:
The container calls the jspInit() to initialize te servlet instance.
and is called only once for a servlet instance.
so if we are opening JDBC conection in JspInit(), we will get only one connection.
for the subsequent requests we have to use this single connection, results in starvation.
where as in the case of connection pool ,we will get a pool of connections when the container starts
we can make use of any of these available connections when we receive multiple requests.You can, normally, have multiple statements on the same connection, and since a JSP should only be reading (never updating) there won't be any (what I like to call) "commit cross-overs", so this is not "in principal" a problem.
It would not, however, be ultimately practical. And the practice (a single connection per Servlet/Jsp) is still not one I would reccommend, for any reason.

Can any body identify my problem with database connection?

My connection statement looks like this
Class.forName(sun.jdbc.odbc.JdbcOdbcDriver);
DriverManager.getConnection("jdbc:odbc:ram");
Iam using jdk1.3 and oracle 9i client edition.
The exception is .......
java.sql.sqlexception: No suitable driver.
The interesting thing is, with the same above connection statement , i am able to connect my core java program with oracle. But not with J2ee application.
Can anybody resolve my prob?

This is the thread where Guhan asked the same question:
http://forum.java.sun.com/thread.jspa?threadID=5209455&tstart=50
He's a classmate of the OP.
If anyone thinks they can improve on this mess, please be my guest.
%

DATABASE CONNECTIVITY PROBLEM IN JSP

Hello Friends .
I am facing problem in database connectivity with JSP . Following is the code .
<%
String accessDBURLPrefix = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=";
String accessDBURLSuffix = ";DriverID=22;READONLY=false}";
String databaseURL = accessDBURLPrefix + "db1.mdb" + accessDBURLSuffix;
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
java.sql.Connection con = java.sql.DriverManager.getConnection(databaseURL, "", "");
out.println("Connection created sucessfully");
catch(Exception e)
out.println(e);
%>
It gives following output :
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Could not find file '(unknown)'.
If I run the code in core java application then it works sucessfully .
Plz help me to find the solution .
I am using sun studio Enterprise 8.1
have stored the access file in web direcotry in the project.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------

Please use CODE tags when posting code. You are losing some of the plus signs of string concatenation to the forum's formatting beast.
Preferred solution: Don't use Access as a database. The JDBC-ODBC bridge is always troublesome.
If you must use Access...
Well the message is easy enough to understand: it can't find the database db1.mdb.
You say you put db1.mdb in the web directory. Obviously the computer is not looking there (silly computer for not looking where you put the file)
So it is up to you to be smart and tell the computer exactly where to go.
Using application.getRealPath("/db1.mdb") in place of "db1.mdb" will probably work in a JSP.
String databaseURL = accessDBURLPrefix + application.getRealPath("/db1.mdb") + accessDBURLSuffix;cheers,
evnafets

Regarding problem of database connectivity of JApplet

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