Fixed the Dashboard and Topology bug.

apm-collector/apm-collector-ui/collector-ui-jetty-provider/src/main/java/org/apache/skywalking/apm/collector/ui/service/ApplicationService.java

@@ -72,11 +72,12 @@ public class ApplicationService {
         int... applicationIds) {
         List<Application> applications = instanceDAO.getApplications(startSecondTimeBucket, endSecondTimeBucket, applicationIds);
 
-        applications.forEach(application -> {
+        for (int i = applications.size() - 1; i >= 0; i--) {
+            Application application = applications.get(i);
             if (application.getId() == Const.NONE_APPLICATION_ID) {
-                applications.remove(application);
+                applications.remove(i);
             }
-        });
+        }
 
         applications.forEach(application -> {
             String applicationCode = applicationCacheService.getApplicationById(application.getId()).getApplicationCode();
@@ -112,7 +113,8 @@ public class ApplicationService {
         return applicationThroughput;
     }
 
-    public ConjecturalAppBrief getConjecturalApps(Step step, long startSecondTimeBucket, long endSecondTimeBucket) throws ParseException {
+    public ConjecturalAppBrief getConjecturalApps(Step step, long startSecondTimeBucket,
+        long endSecondTimeBucket) throws ParseException {
         List<ConjecturalApp> conjecturalApps = networkAddressUIDAO.getConjecturalApps();
         conjecturalApps.forEach(conjecturalApp -> {
             String name = ServerTypeDefine.getInstance().getServerType(conjecturalApp.getId());

apm-collector/apm-collector-ui/collector-ui-jetty-provider/src/main/java/org/apache/skywalking/apm/collector/ui/service/SecondBetweenService.java

@@ -53,6 +53,10 @@ class SecondBetweenService {
         Date startDate = new SimpleDateFormat("yyyyMMddHHmmss").parse(String.valueOf(startSecondTimeBucket));
         Date endDate = new SimpleDateFormat("yyyyMMddHHmmss").parse(String.valueOf(endSecondTimeBucket));
 
-        return Seconds.secondsBetween(new DateTime(startDate), new DateTime(endDate)).getSeconds();
+        int seconds = Seconds.secondsBetween(new DateTime(startDate), new DateTime(endDate)).getSeconds();
+        if (seconds == 0) {
+            seconds = 1;
+        }
+        return seconds;
     }
 }

apm-collector/apm-collector-ui/collector-ui-jetty-provider/src/main/java/org/apache/skywalking/apm/collector/ui/utils/ApdexCalculator.java

@@ -25,6 +25,10 @@ public enum ApdexCalculator {
     INSTANCE;
 
     public int calculate(long satisfiedCount, long toleratingCount, long frustratedCount) {
-        return (int)(((satisfiedCount + toleratingCount / 2) * 100) / (satisfiedCount + toleratingCount + frustratedCount));
+        if (satisfiedCount + toleratingCount + frustratedCount == 0) {
+            return 100;
+        } else {
+            return (int)(((satisfiedCount + toleratingCount / 2) * 100) / (satisfiedCount + toleratingCount + frustratedCount));
+        }
     }
 }