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"APPLET SERVLET " NOT WORKING

 
Greenhorn
Posts: 7
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I have an applet which simply has to communicate with the Servlet.My applet has textfield which send the data to the servlet .

MY APPLET:
---------:
public class CompanyMasterMaintenance extends JApplet {

boolean isStandalone = false;
GridBagLayout gridBagLayout1 = new GridBagLayout();
JLabel jtlcmpcode = new JLabel();
JTextField jtfcmpcode = new JTextField();
JLabel jlcmpname = new JLabel();
JTextField jtfcmpname = new JTextField();
JLabel jladd = new JLabel();
JLabel jldblink = new JLabel();
JTextField jtfdblink = new JTextField();
//Get a parameter value
DialogDemo dlgMode;
static String str1 ;
JLabel jlcmpcode = new JLabel();
TextArea jtaadd = new TextArea();
JButton jblkup = new JButton();
ButtonControl jbSave = new ButtonControl();
ButtonControl jbCancel = new ButtonControl();
ButtonControl jbExit = new ButtonControl();
public String getParameter(String key, String def) {
return isStandalone ? System.getProperty(key, def) :
(getParameter(key) != null ? getParameter(key) : def);
}
//Construct the applet
public CompanyMasterMaintenance() {
}
//Initialize the applet
public void init() {
try {
this.getContentPane().setBackground( new Color(155,218,238));
//dlgMode=new DialogDemo(this);
jbInit();
}
catch (Exception e) {
e.printStackTrace();
}
}
//static {
// try {
// //UIManager.setLookAndFeel(new com.sun.java.swing.plaf.metal.MetalLookAndFeel());
// //UIManager.setLookAndFeel(new com.sun.java.swing.plaf.motif.MotifLookAndFeel());
// UIManager.setLookAndFeel(new com.sun.java.swing.plaf.windows.WindowsLookAndFeel());
// }
// catch (Exception e) {}
//}
//Component initialization
private void jbInit() throws Exception {
this.getContentPane().setBackground( new Color(155,218,238));
this.setVisible(true);
jtlcmpcode.setText("Company Code");
jlcmpcode.setForeground(new Color(0, 0, 120));
jlcmpcode.setFont(new Font("TimesRoman", 1, 12));
jtfcmpcode.setFont(new Font("TimesRoman", 0, 12));
jtfcmpcode.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(KeyEvent e) {
jtfcmpcode_keyTyped(e);
}
});
jtfcmpcode.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jtfcmpcode_actionPerformed(e);
}
});
jlcmpname.setText("Company Name");
jlcmpname.setForeground(new Color(0, 0, 120));
jlcmpname.setFont(new Font("TimesRoman", 1, 12));
jtfcmpname.setFont(new Font("TimesRoman", 0, 12));
jtfcmpname.addKeyListener(new java.awt.event.KeyAdapter() {

public void keyTyped(KeyEvent e) {
jtfcmpname_keyTyped(e);
}
});
jladd.setText("Address");
jladd.setForeground(new Color(0, 0, 120));
jladd.setFont(new Font("TimesRoman", 1, 12));
jldblink.setText("DB Link");
jldblink.setForeground(new Color(0, 0, 120));
jldblink.setFont(new Font("TimesRoman", 1, 12));
jtfdblink.setFont(new Font("TimesRoman", 0, 12));
jtfdblink.addKeyListener(new
java.awt.event.KeyAdapter() {
public void keyTyped(KeyEvent e4) {
jtfdblink_keyTyped(e4);
}
});
jlcmpcode.setText("Company Code");
jlcmpcode.setForeground(new Color(0, 0, 120));
jlcmpcode.setFont(new Font("TimesRoman", 1, 12));
jblkup.setText("?");
jblkup.setForeground(new Color(0, 0, 120));
jblkup.setFont(new Font("TimesRoman", 1, 12));
jbSave.setAlignment(borland.jbcl.util.Alignment.RIGHT | borland.jbcl.util.Alignment.MIDDLE);
jbSave.setLabel("Save");
jbSave.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jbSave_actionPerformed(e);
}
});
jbCancel.setLabel("Cancel");
jbCancel.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jbCancel_actionPerformed(e);
}
});
jbExit.setLabel("Exit");
jbExit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jbExit_actionPerformed(e);
}
});
jblkup.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(MouseEvent e) {
jblkup_mouseClicked(e);
}
});
jblkup.setEnabled(true);
jblkup.setVisible(true);
jtaadd.setBackground(Color.white);
this.getContentPane().setLayout(gridBagLayout1);
this.setSize(400,300);
this.getContentPane().add(jtfcmpcode, new GridBagConstraints2(1, 0, 1, 1, 0.0, 1.0
,GridBagConstraints.EAST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 138, 0));
this.getContentPane().add(jlcmpname, new GridBagConstraints2(0, 1, 1, 1, 1.0, 0.0
,GridBagConstraints.SOUTH, GridBagConstraints.NONE, new Insets(-1, 4, 0, 5), 5, 0));
this.getContentPane().add(jtfcmpname, new GridBagConstraints2(1, 1, 4, 2, 0.0, 1.0
,GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(-1, 0, 0, 0), 196, 0));
this.getContentPane().add(jladd, new GridBagConstraints2(0, 2, 1, 3, 1.0, 0.0
,GridBagConstraints.SOUTH, GridBagConstraints.NONE, new Insets(39, 17, 35, 29), 2, 5));
this.getContentPane().add(jldblink, new GridBagConstraints2(0, 5, 1, 2, 1.0, 1.0
,GridBagConstraints.NORTH, GridBagConstraints.NONE, new Insets(0, 0, 0, 1), 0, -1));
this.getContentPane().add(jtfdblink, new GridBagConstraints2(1, 5, 3, 2, 1.0, 1.0
,GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(-1, 0, 0, 1), 185, 0));
this.getContentPane().add(jlcmpcode, new GridBagConstraints2(0, 0, 1, 1, 1.0, 0.0
,GridBagConstraints.EAST, GridBagConstraints.NONE, new Insets(0, 36, 0, 12), 64, 1));
this.getContentPane().add(jtaadd, new GridBagConstraints2(1, 3, 2, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(1, 0, 11, 116), -280, -107));
this.getContentPane().add(jblkup, new GridBagConstraints2(2, 0, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 1, 0, 97), 0, -5));
this.getContentPane().add(jbSave, new GridBagConstraints2(0, 7, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
this.getContentPane().add(jbCancel, new GridBagConstraints2(1, 7, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
this.getContentPane().add(jbExit, new GridBagConstraints2(2, 7, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
}
//Start the applet
public void start() {
dlgMode =new DialogDemo(JOptionPane.getFrameForComponent(this), this , true);
this.setEnabled(true);
jtfcmpcode.grabFocus();
}
//Stop the applet
public void stop() {
}
//Destroy the applet
public void destroy() {
}
//Get Applet information
public String getAppletInfo() {
return "Applet Information";
}
//Get parameter info
public String[][] getParameterInfo() {
return null;
}
//Main method
public static void main(String[] args) {
CompanyMasterMaintenance applet = new CompanyMasterMaintenance();
applet.isStandalone = true;
JFrame frame = new JFrame();
frame.setTitle("CompanyMasterMaintenance");
frame.getContentPane().add(applet, BorderLayout.CENTER);
applet.init();
applet.start();
frame.setSize(380,200);
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
frame.setVisible(true);
}
void jtfcmpcode_actionPerformed(ActionEvent e) {
}
void jtfcmpname_keyTyped(KeyEvent e2)
{
String cmpna=jtfcmpname.getText();
if(cmpna.length()>49)
{
cmpna=cmpna.substring(0,cmpna.length()-1);
jtfcmpname.setText(cmpna);

}
}
void jtfdblink_keyTyped(KeyEvent e4)
{
String link=jtfdblink.getText();
if(link.length()>24)
{
link=link.substring(0,link.length()-1);
jtfdblink.setText(link);
}
}
void jblkup_mouseClicked(MouseEvent me)
{
//this.requestFocus();
System.out.println(dlgMode.mode);


}
void jtfcmpcode_keyTyped(KeyEvent e) {
String coc=jtfcmpcode.getText();
if(coc.length()>9)
{
coc=coc.substring(0,coc.length()-1);
jtfcmpcode.setText(coc);

}
}
void jbSave_actionPerformed(ActionEvent e) {

String cmpcode="",cmpname="",cmpadd="",cmpdblink="",Servlet="",param="";
//y
// {

cmpcode=jtfcmpcode.getText();

cmpname=jtfcmpname.getText();
cmpadd=jtaadd.getText();
cmpdblink=jtfdblink.getText();
param=cmpcode+","+cmpname+","+cmpadd+"'"+cmpdblink;
System.out.println(cmpcode+cmpname+cmpadd+cmpdblink);
//}
//catch(NullPointerException ne){System.out.println(ne.getMessage());}
URL conn=null;
URLConnection urc;
try
{
// conn= new URL(protocol,host,int port,String file)
conn= new URL("http://localhost:8080/servlet/CompanyMasterMaintenance");
urc = conn.openConnection();
System.out.println("URL Connectin Ok");
urc.setUseCaches(false);
urc.setDoOutput(true);
PrintStream out = new PrintStream(urc.getOutputStream());
//DataOutputStream out=new DataOutputStream(urc.getOutputStream());
System.out.println("inside action "+param);
out.println(param);

//out.writeUTF(param);
out.flush();
out.close();
}
catch(IOException e1)
{
System.out.println(e1);
}
}
void jbCancel_actionPerformed(ActionEvent e) {
System.out.println("Cancel selected");
}
void jbExit_actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand().toString());
System.out.println("exit selected");
}
================================================================
MY SERVLET
================================================================
public class CMMServlet extends HttpServlet {
//Initialize global variables
//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
System.out.println("1");
PrintWriter out = new PrintWriter (response.getOutputStream());
System.out.println("2");
out.println("<html>");
out.println("<head><title>CMMServlet</title></head>");
out.println("<body>");
out.println("</body></html>");
out.close();
try{
/* System.out.println("inside servlet");
DataInputStream din =new DataInputStream(request.getInputStream());
String param =din.readUTF();
System.out.println(param);
din.close(); */
StringBuffer msgBuf = new StringBuffer();
BufferedReader fromApplet = request.getReader();
String line;
while ((line=fromApplet.readLine())!=null) {
if (msgBuf.length()>0) msgBuf.append('\n');
msgBuf.append(line);
}
fromApplet.close();
// Write the message back to the applet
response.setContentType("text/plain");
PrintWriter toApplet = response.getWriter();
toApplet.println("d sent this text in response");
toApplet.close();
}
catch(Exception e){
e.printStackTrace();
System.out.println(e);
}
}
//Get Servlet information
public String getServletInfo() {
return "CMMServlet Information";
}
}
but when i load the applet in the browser through html. my console says
"com.ms.security.SecurityExceptionEx[Host]: java.io.IOException: bad path: C:\WINDOWS\Java\lib\swing.properties
at com/ms/security/permissions/FileIOPermission.check
at com/ms/security/PolicyEngine.deepCheck
at com/ms/security/PolicyEngine.checkPermission
at com/ms/security/StandardSecurityManager.chk
at com/ms/security/StandardSecurityManager.checkRead
at java/io/FileInputStream.<init>
at java/io/FileInputStream.<init>
at com/sun/java/swing/UIManager.loadSwingProperties
at com/sun/java/swing/UIManager.initialize
at com/sun/java/swing/UIManager.maybeInitialize
at com/sun/java/swing/UIManager.getDefaults
at com/sun/java/swing/UIManager.getColor
at com/sun/java/swing/JPanel.<init>
at com/sun/java/swing/JPanel.<init>
at com/sun/java/swing/JRootPane.createGlassPane
at com/sun/java/swing/JRootPane.<init>
at com/sun/java/swing/JApplet.createRootPane
at com/sun/java/swing/JApplet.<init>
at CompanyMasterMaintenance.<init>
at com/ms/applet/BrowserAppletFrame.newInstance
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.run
at java/lang/Thread.run
com.ms.security.SecurityExceptionEx[Host]: Event queue access denied.
at com/ms/security/permissions/UIPermission.check
at com/ms/security/PolicyEngine.deepCheck
at com/ms/security/PolicyEngine.checkPermission
at com/ms/security/StandardSecurityManager.chk
at com/ms/security/StandardSecurityManager.checkAwtEventQueueAccess
at java/awt/Toolkit.getSystemEventQueue
at com/sun/java/swing/SwingUtilities.getEventQueue
at com/sun/java/swing/SwingUtilities.invokeLater
at com/sun/java/swing/JComponent.revalidate
at com/sun/java/swing/JTextField.setFont
at com/sun/java/swing/text/DefaultTextUI.installDefaults
at com/sun/java/swing/text/DefaultTextUI.installUI
at com/sun/java/swing/JComponent.setUI
at com/sun/java/swing/text/JTextComponent.setUI
at com/sun/java/swing/text/JTextComponent.updateUI
at com/sun/java/swing/text/JTextComponent.<init>
at com/sun/java/swing/JTextField.<init>
at com/sun/java/swing/JTextField.<init>
at CompanyMasterMaintenance.<init>
at com/ms/applet/BrowserAppletFrame.newInstance
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.run
at java/lang/Thread.run
"
please any one kindly solve this
 
Sheriff
Posts: 6961
2
Eclipse IDE Debian Java
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"sridhar",
The Java Ranch has thousands of visitors every week, many with surprisingly similar names. To avoid confusion we have a naming convention, described at http://www.javaranch.com/name.jsp . We require names to have at least two words, separated by a space, and strongly recommend that you use your full real name. Please log in with a new name which meets the requirements.
Thanks.
 
Ranch Hand
Posts: 124
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Hi,
conn= new URL("http://localhost:8080/servlet/CompanyMasterMaintenance");
This line could be the problem.
An applet is allowed to open sockets only on the machine from where it was loaded. Thus, if the DNS name/IP address differs, the browser JVM would throw a Security Exception.
Change the above line to
String codebase = this.getCodebase();
String url = codebase + ":8080/servlet/CompanyMasterMaintenance";
conn = new URL(url);
If this does not work, try commenting out the Toolkit line. I am not sure, but, applets may not be allowed to get the Default toolkit.
Hope this helps.
Ashwin.
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