recordset is not returning any value

recordset is not returning any value

I have following code:
try {
String sql="select username from UserMaster";
statement = conn.createStatement();
resultSet = statement.executeQuery(sql);
int value=resultSet.getInt(1);
if (value > 0) {
recFound = 1;
} else {
recFound = 0;
}
if (recFound > 0) {
return true;
} else {
return false;
}
}
catch (Exception e)
{
e.printStackTrace();
return false;
}
This code is made to check if user exists or not.
But getting error because recordset does not contain any value.
My database is having a value. I also tested connection.
Code is also making connection to Databse sucessfully.
But not understanding why its not fetching values from table.
Following is logcat:
09-11 13:39:30.126: W/KeyCharacterMap(1625): No keyboard for id 0
09-11 13:39:30.126: W/KeyCharacterMap(1625): Using default keymap:
/system/usr/keychars/qwerty.kcm.bin
09-11 13:39:38.967: W/System.err(1625): java.sql.SQLException: No current
row in the ResultSet.
09-11 13:39:38.967: W/System.err(1625): at
net.sourceforge.jtds.jdbc.JtdsResultSet.getColumn(JtdsResultSet.java:270)
09-11 13:39:38.967: W/System.err(1625): at
net.sourceforge.jtds.jdbc.JtdsResultSet.getInt(JtdsResultSet.java:641)
09-11 13:39:38.976: W/System.err(1625): at
com.example.messagesql.gaSQLConnect.CheckUser(gaSQLConnect.java:69)
09-11 13:39:38.976: W/System.err(1625): at
com.example.messagesql.Login$1.onClick(Login.java:38)
09-11 13:39:38.976: W/System.err(1625): at
android.view.View.performClick(View.java:2485)
09-11 13:39:38.976: W/System.err(1625): at
android.view.View$PerformClick.run(View.java:9080)
09-11 13:39:38.986: W/System.err(1625): at
android.os.Handler.handleCallback(Handler.java:587)
09-11 13:39:38.986: W/System.err(1625): at
android.os.Handler.dispatchMessage(Handler.java:92)
09-11 13:39:38.986: W/System.err(1625): at
android.os.Looper.loop(Looper.java:123)
09-11 13:39:38.986: W/System.err(1625): at
android.app.ActivityThread.main(ActivityThread.java:3683)
09-11 13:39:38.986: W/System.err(1625): at
java.lang.reflect.Method.invokeNative(Native Method)
09-11 13:39:38.986: W/System.err(1625): at
java.lang.reflect.Method.invoke(Method.java:507)
09-11 13:39:38.986: W/System.err(1625): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
09-11 13:39:38.986: W/System.err(1625): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
09-11 13:39:38.986: W/System.err(1625): at
dalvik.system.NativeStart.main(Native Method)