Odtnhj

This makes me really curious.There is a button which sends a simple post request by ajax on a jsp page,and I use a RESTFUL method to handle this request,but that method will be executed twice or three times.This will only happen on CentOS 7.3,on my laptop I use windows10, multi-thread will not happen.I have searched on Google but nothing helpful
has been found.Here are the codes:

asset.jsp:

<button class="btn btn-default btn-sm" title="allDoMi">
 <i class="fa fa-arrow-down">allDoMi</i>
</button>
$("button[title='allDoMi']").click(function () 
 var dataparam = "version=1";
 if (!confirm('confirm all DoMi？'))
 return;
 //ajax request
 $.ajax(
 contentType: "application/json",
 url: serviceurl.baseurl + "/asset/doMiAction",
 data: dataparam,
 beforeSend: function () 
 //do nothing
 ,
 error: function () 
 //do nothing
 ,
 success: function (info) 
 //do nothing 
 
 );
);

Asset.java

@Service
@Path("/asset")
public class AssetRest {
 @Path("/doMiAction")
 @POST
 @Produces( MediaType.APPLICATION_JSON, 
 MediaType.APPLICATION_XML )
 public RestfulResult doMiAction(@FormParam("version") String 
 version) 
 logger.info("doMiAction method began....");
 //package data for duMiSyncDtos,here only for test
 List<DuMiSyncDto> duMiSyncDtos =new List<>();
 //this url is for http simulation using HttpURLConnection
 final String dumiUrl = "http://someip/someurl";
 final Map<String, List<DuMiSyncDto>> map; 
 //only continue when list is not empty
 if (!duMiSyncDtos.isEmpty()) 
 //this method used for sync data in a certain order
 map = groupList(duMiSyncDtos);
 SortedSet<String> ss = new TreeSet<>(map.keySet());
 final Iterator<String> iter = ss.iterator();
 final ScheduledExecutorService ticker = Executors.newSingleThreadScheduledExecutor();
 logger.info("NEW A SINGLETHREADSCHEDULEDEXECUTOR");
 //retrieve data from a .property file,I set it 20000,therefore the job will be executed in every 20 seconds
 final int DELAY = NumberUtils.toInt(WebUtils.getConfigValue("dumi.delay"));
 ticker.scheduleWithFixedDelay(new Runnable() 
 private int count;
 public void run() 
 logger.info("BEGIN RUN METHOD:"+System.identityHashCode(AssetRest.this));
 if(iter.hasNext()) 
 try 
 List<DuMiSyncDto> value = map.get(iter.next());
 //this method used for simulating a httprequest using HttpURLConnection to invoke a remote service to get the result info which forms in a JSON string format
 String resultmsg = getDuMiReturnMessage(dumiUrl,value);
 if(resultmsg!=null && !resultmsg.contains(""code":"0000"")) 
 logger.info("Return code is "+resultmsg+",the sync work will be terminated.");
 ticker.shutdown();
 return;
 
 //this method used for showing some useful infomation on the console using log4j
 showSyncInfomation(value);
 //this method used for count how many items have been synchronized successfully
 int currentcount = getSyncCount(resultmsg);
 count += currentcount ;
 logger.info("current sync data:"+currentcount+"，summing data"+count+"");
 catch (Exception e) 
 logger.error("method[doMiAction]...executing schedule:",e);
 
 else 
 ticker.shutdown();
 
 
 , 0, DELAY, TimeUnit.MILLISECONDS);
 

After I click the button,all the log info will be shown on Putty console for two or three times,yet I have clicked that button for only ONCE!I have tested for several times,it will happen,but in windows on my laptop,this will not happen at all.Here is a detail might be help:previously the implementation for timed execution is not like this,it has been written like :

for(DuMiSyncDto dto:duMiSyncDtoList)
 //do the business code
 Thread.sleep(20000);

Because there is database synchronization from the remote service,I need to control the interval time not too soon between every two operations:execute in every 20 seconds and 100 data at a time.In this situation,the multi-thread problem occurs,I thought it may be the for loop which aroused so I change the way using a JDK API instead but issues were still there.So WHY all of these?

---------------------------first edit------------------------------------------

private int getSyncCount(String resultmsg) 
 int count = 0;
 JSONObject obj = JSONObject.fromObject(resultmsg);
 String message = obj.getString("message");
 if(!WebUtils.isEmpty(message)) 
 String arr = message.split(" ");
 if(arr!=null && arr.length>1) 
 count += Integer.parseInt(arr[1].trim());
 
 
 logger.info("currentThreadName:"+Thread.currentThread().getName());
 return count;

Notice in this method,I log the current thread name,and it shows :

... 
currentThreadName:pool-1-thread-1
currentThreadName:pool-2-thread-1
currentThreadName:pool-3-thread-1
...

when there are 3 threads.