Java.util.Timer and java.util.TimerTask running threads problem

Question

Hi,
I have following scenario.
1. My thread to send mail has to run at a fixed time interval thus I am using the following method from the Timer class.
scheduleAtFixedRate(TimerTask object, start time, interval)
2. My thread in the class checkDBSendEmail that extends TimerTask class reads database and sends mail based on the data received in the run() method.
3. Whenever I send any mail, I log it into a database table that keeps the record of the emails sent.
4. i have put it some logic to filter data form data base after that it will sends me unique data. Data should be email to different uses based on the list.
Now the Problem:
I am receiving duplicate mails on multiple times.
Is there anything that I am missing in the following that would help me resolve this problem.
my Servlet inti method is:

Answer 1

sorry code is here..........
public class SchduleTimeEmail extends HttpServlet implements SingleThreadModel{
public void init( ServletConfig servletConfig ) throws ServletException{
super.init(servletConfig);
this.config = servletConfig;
try{
// specify in the format as in 12.13.52 or 3:30pm
initialTime = format.parse( config.getInitParameter("initialTime"));
delay = HOURS_24;
RunLogger.addLogger("init first try:"); // log file
catch( ParseException pe ){
// Log.sendMessage( Log.MESSAGE_LEVEL_INFO , "[TimerServlet]", "startTime could not be parsed from web.xml file" );
System.out.println("startTime could not be parsed from web.xml file."+pe);
initialTime = new Date();
delay = HOURS_24;
// Timer Must start combination of 15,30,45,00 min for check schdule
Date dalayTimeMinSec = new Date();
int currentMin = dalayTimeMinSec.getMinutes();
int totalDelayTime = 0;
if(currentMin%15!=0 || currentMin%15 != 15){
try {
int delayMin = currentMin % 15;
totalDelayTime = (15-delayMin) * 1000 * 60;
dalayTimeMinSec.setSeconds(0);
Thread.sleep(totalDelayTime);
RunLogger.addLogger("Thread go for sleep:");
} catch (InterruptedException ex) {
RunLogger.addLogger(ex.toString());
//Start Timer from this time
timer = new Timer();
Calendar time = Calendar.getInstance();
Calendar timeOfDay = Calendar.getInstance();
try{
timeOfDay.setTime(initialTime);
time.set((Calendar.HOUR_OF_DAY), timeOfDay.get(Calendar.HOUR_OF_DAY));
time.set(Calendar.MINUTE, timeOfDay.get(Calendar.MINUTE));
time.set(Calendar.SECOND, timeOfDay.get(Calendar.SECOND));
Calendar startTimeOfTimer = Calendar.getInstance();
startTimeOfTimer.add( Calendar.MINUTE, 0 );
// make sure the first timer doesn't fire before the server starts
if( time.before(startTimeOfTimer) )
time = startTimeOfTimer;
System.out.println("TimerServlet: Timer has been set for " + time.getTime() + " '(" + delay + ")'"); // for checking
checkDBSendEmail msasTask = new checkDBSendEmail();
timer.scheduleAtFixedRate( msasTask, time.getTime(), delay );
catch( Exception e ){
RunLogger.addLogger(e.toString());
public void destroy(){
timer.cancel();
super.destroy();
and another class is:..
public class checkDBSendEmail extends TimerTask{
public void run()
// System.out.println("Function run : "+ functionExcuteCount++);
try{
// DB Logic as well as send e-mail function call
catch( Exception ex ){
RunLogger.addLogger(ex.toString());
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
public String getServletInfo() {
return "Short description";
// </editor-fold>
I also checked the email server settings, and I am sure that the email server is not duplicating the emails.
this code working correctly on my local machine But in live server it duplicating email and still I am receiving duplicate mails.
Any help is appreciated.
Thanks,
Sharda