Soumya Mathai

I'm using MySQL as database in server machine.

pls help me solve this problem.

regards,
saumya.

Hai,
I'm doing an application which has a login page. it queries the database and check for user authetication and later if valid user he should be given the various options mentioned..
i get that whether the user id valid or not but my problem is....i don't know how to direct it to the options to be given to the user since it is written as different MIDlet.and also since all the operations has got a connection to the databse which is been handled by thread.. when one or more threads comes in one program it is showing a deadlock warning() when MIDlet is executed.
please help me....if anyone knows please tell how to connect the login page and the options to be performed?

regards,
Saumya.

I tried using this code :

import java.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.io.*;

public class HttpLogger extends MIDlet {

private Display display;

private Command exitCommand =
new Command( "Exit", Command.EXIT, 1 );
private Command okCommand =
new Command( "OK", Command.OK, 1 );
private Command cancelCommand =
new Command( "Cancel", Command.CANCEL, 1 );

private URLEntry mainForm;


public HttpLogger(){
}

protected void destroyApp( boolean unconditional )
throws MIDletStateChangeException {
exitMIDlet();
}

protected void pauseApp(){
}

protected void startApp()
throws MIDletStateChangeException {
if( display == null ){
initMIDlet();
}
}

private void initMIDlet(){
display = Display.getDisplay(this);
mainForm=new URLEntry();
display.setCurrent(mainForm);
}

public void exitMIDlet(){
notifyDestroyed();
}


void displayError( Throwable e, Displayable next ){
Alert a = new Alert( "Exception" );
a.setString( e.toString() );
a.setTimeout( Alert.FOREVER );
display.setCurrent( a, next );
}

class URLEntry extends TextBox implements CommandListener {

URLEntry()
{
super("Enter URL:","localhost:8080/jsp-examples/hello.html",100,0 );
addCommand(exitCommand );
addCommand(okCommand );
setCommandListener( this );
}

public void commandAction( Command c,
Displayable d ){
if( c == exitCommand ){
exitMIDlet();
}
else if( c == okCommand ) {
try {
HttpConnection conn =(HttpConnection)Connector.open("http://"+getString());
display.setCurrent(new Logger( this, conn ) );
}
catch( IOException e ){
displayError( e, this );
}
}
}
}


class Logger extends Form
implements Runnable, CommandListener {
private Displayable next;
private HttpConnection conn;
private StringItem text =
new StringItem( null, "" );

Logger( Displayable next,
HttpConnection conn )
{
super( "HTTP Log" );

this.next = next;
this.conn = conn;

addCommand( cancelCommand );
setCommandListener( this );

append( text );

Thread t = new Thread( this );
t.start();
}

public void commandAction( Command c,
Displayable d ){
display.setCurrent( next );

try {
conn.close();
}
catch( IOException e ){
displayError( e, next );
}
}

public void run(){
update( "Connecting to " + conn.getURL() );

try {
int rc = conn.getResponseCode();
update( "Response code: " + rc );
update( "Response message: " +
conn.getResponseMessage() );

String key;

for( int i = 0;
( key =
conn.getHeaderFieldKey( i ) )
!= null;
++i ){
update( key + ": " +
conn.getHeaderField( i ) );
}
}
catch( IOException e ){
update( "Caught exception: " +
e.toString() );
}

removeCommand( cancelCommand );
addCommand( okCommand );
}

void update( String line ){
if( display.getCurrent() != this ) return;

String old = text.getText();
StringBuffer buf = new StringBuffer();

buf.append( old );
if( old.length() > 0 ){
buf.append( '\n' );
}

buf.append( line );
text.setText( buf.toString() );
}
}
}

but i'm getting the warning as:


Warning: To avoid potential deadock,operations that may block,such as
networking should be performed ina different thread than the
commandAction() handler.

how to solve this?

Please help...,

Saumya.

Please help me to solve the problem

I tried using this code :

import java.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.io.*;

public class HttpLogger extends MIDlet {

private Display display;

private Command exitCommand =
new Command( "Exit", Command.EXIT, 1 );
private Command okCommand =
new Command( "OK", Command.OK, 1 );
private Command cancelCommand =
new Command( "Cancel", Command.CANCEL, 1 );

private URLEntry mainForm;


public HttpLogger(){
}

protected void destroyApp( boolean unconditional )
throws MIDletStateChangeException {
exitMIDlet();
}

protected void pauseApp(){
}

protected void startApp()
throws MIDletStateChangeException {
if( display == null ){
initMIDlet();
}
}

private void initMIDlet(){
display = Display.getDisplay(this);
mainForm=new URLEntry();
display.setCurrent(mainForm);
}

public void exitMIDlet(){
notifyDestroyed();
}


void displayError( Throwable e, Displayable next ){
Alert a = new Alert( "Exception" );
a.setString( e.toString() );
a.setTimeout( Alert.FOREVER );
display.setCurrent( a, next );
}

class URLEntry extends TextBox implements CommandListener {

URLEntry()
{
super("Enter URL:","localhost:8080/jsp-examples/hello.html",100,0 );
addCommand(exitCommand );
addCommand(okCommand );
setCommandListener( this );
}

public void commandAction( Command c,
Displayable d ){
if( c == exitCommand ){
exitMIDlet();
}
else if( c == okCommand ) {
try {
HttpConnection conn =(HttpConnection)Connector.open("http://"+getString());
display.setCurrent(new Logger( this, conn ) );
}
catch( IOException e ){
displayError( e, this );
}
}
}
}


class Logger extends Form
implements Runnable, CommandListener {
private Displayable next;
private HttpConnection conn;
private StringItem text =
new StringItem( null, "" );

Logger( Displayable next,
HttpConnection conn )
{
super( "HTTP Log" );

this.next = next;
this.conn = conn;

addCommand( cancelCommand );
setCommandListener( this );

append( text );

Thread t = new Thread( this );
t.start();
}

public void commandAction( Command c,
Displayable d ){
display.setCurrent( next );

try {
conn.close();
}
catch( IOException e ){
displayError( e, next );
}
}

public void run(){
update( "Connecting to " + conn.getURL() );

try {
int rc = conn.getResponseCode();
update( "Response code: " + rc );
update( "Response message: " +
conn.getResponseMessage() );

String key;

for( int i = 0;
( key =
conn.getHeaderFieldKey( i ) )
!= null;
++i ){
update( key + ": " +
conn.getHeaderField( i ) );
}
}
catch( IOException e ){
update( "Caught exception: " +
e.toString() );
}

removeCommand( cancelCommand );
addCommand( okCommand );
}

void update( String line ){
if( display.getCurrent() != this ) return;

String old = text.getText();
StringBuffer buf = new StringBuffer();

buf.append( old );
if( old.length() > 0 ){
buf.append( '\n' );
}

buf.append( line );
text.setText( buf.toString() );
}
}
}

but still it is showing the same warning as:


Warning: To avoid potential deadock,operations that may block,such as
networking should be performed ina different thread than the
commandAction() handler.

how to solve this?

Please help...,

Saumya.

I tried using thread.If a string is been assigned to a variable then the result is been got in the MIDlet. But if a text box or a text field is used then the value is not been retrieved and is not invoking the JSP.

When the Midlet runs it shows a warning like

Warning: To avoid potential deadock,operations that may block,such as
networking should be performed ina different thread than the
commandAction() handler.

Then i tried creating two classes.But still it shows the same warning.

Please help me...to solve this.

Soumya.