Program: 163833
Project: 163833
Buggy source:
@Override public void onPerformSync(Account account,Bundle extras,String authority,ContentProviderClient provider,SyncResult syncResult){
  Log.d(TAG,"String_Node_Str" + authority);
  Thread.currentThread().setContextClassLoader(getContext().getClassLoader());
  Optional<DavAccount> davAccountOptional=DavAccountHelper.getAccount(getContext());
  if (!davAccountOptional.isPresent()) {
    Log.d(TAG,"String_Node_Str");
    syncResult.stats.numAuthExceptions++;
    showNotifications(syncResult);
    return;
  }
  try {
    Optional<MasterCipher> masterCipher=KeyHelper.getMasterCipher(getContext());
    if (!masterCipher.isPresent()) {
      Log.d(TAG,"String_Node_Str");
      syncResult.stats.numAuthExceptions++;
      return;
    }
    LocalCalendarStore localStore=new LocalCalendarStore(provider,davAccountOptional.get().getOsAccount());
    HidingCalDavStore remoteStore=DavAccountHelper.getHidingCalDavStore(getContext(),davAccountOptional.get(),masterCipher.get());
    if (DavAccountHelper.isUsingOurServers(getContext())) {
      for (      HidingCalDavCollection remoteCollection : remoteStore.getCollections()) {
        try {
          if (!remoteCollection.getPath().contains(KeySyncUtil.PATH_KEY_COLLECTION) && !localStore.getCollection(remoteCollection.getPath()).isPresent()) {
            if (remoteCollection.getHiddenDisplayName().isPresent() && remoteCollection.getHiddenColor().isPresent()) {
              localStore.addCollection(remoteCollection.getPath(),remoteCollection.getHiddenDisplayName().get(),remoteCollection.getHiddenColor().get());
            }
 else             if (!remoteCollection.getHiddenDisplayName().isPresent())             localStore.addCollection(remoteCollection.getPath(),remoteCollection.getHiddenDisplayName().get());
 else             localStore.addCollection(remoteCollection.getPath());
          }
        }
 catch (        IOException e) {
          handleException(getContext(),e,syncResult);
        }
catch (        PropertyParseException e) {
          handleException(getContext(),e,syncResult);
        }
catch (        RemoteException e) {
          handleException(getContext(),e,syncResult);
        }
catch (        InvalidMacException e) {
          handleException(getContext(),e,syncResult);
        }
catch (        GeneralSecurityException e) {
          handleException(getContext(),e,syncResult);
        }
      }
    }
    for (    LocalEventCollection localCollection : localStore.getCollections()) {
      Log.d(TAG,"String_Node_Str" + localCollection.getPath());
      Optional<HidingCalDavCollection> remoteCollection=remoteStore.getCollection(localCollection.getPath());
      if (remoteCollection.isPresent())       new CalendarSyncWorker(getContext(),localCollection,remoteCollection.get()).run(syncResult,false);
 else {
        Log.d(TAG,"String_Node_Str");
        localStore.removeCollection(localCollection.getPath());
      }
    }
    finalizeCopiedCalendars(localStore,remoteStore);
    remoteStore.releaseConnections();
  }
 catch (  IOException e) {
    handleException(getContext(),e,syncResult);
  }
catch (  DavException e) {
    handleException(getContext(),e,syncResult);
  }
catch (  PropertyParseException e) {
    handleException(getContext(),e,syncResult);
  }
catch (  RemoteException e) {
    handleException(getContext(),e,syncResult);
  }
catch (  GeneralSecurityException e) {
    handleException(getContext(),e,syncResult);
  }
  showNotifications(syncResult);
  new CalendarsSyncScheduler(getContext()).setTimeLastSync(new Date().getTime());
}

Fixed version (ground truth):
@Override public void onPerformSync(Account account,Bundle extras,String authority,ContentProviderClient provider,SyncResult syncResult){
  Log.d(TAG,"String_Node_Str" + authority);
  Thread.currentThread().setContextClassLoader(getContext().getClassLoader());
  Optional<DavAccount> davAccountOptional=DavAccountHelper.getAccount(getContext());
  if (!davAccountOptional.isPresent()) {
    Log.d(TAG,"String_Node_Str");
    syncResult.stats.numAuthExceptions++;
    showNotifications(syncResult);
    return;
  }
  try {
    Optional<MasterCipher> masterCipher=KeyHelper.getMasterCipher(getContext());
    if (!masterCipher.isPresent()) {
      Log.d(TAG,"String_Node_Str");
      syncResult.stats.numAuthExceptions++;
      return;
    }
    LocalCalendarStore localStore=new LocalCalendarStore(provider,davAccountOptional.get().getOsAccount());
    HidingCalDavStore remoteStore=DavAccountHelper.getHidingCalDavStore(getContext(),davAccountOptional.get(),masterCipher.get());
    if (DavAccountHelper.isUsingOurServers(getContext())) {
      for (      HidingCalDavCollection remoteCollection : remoteStore.getCollections()) {
        try {
          if (!remoteCollection.getPath().contains(KeySyncUtil.PATH_KEY_COLLECTION) && !localStore.getCollection(remoteCollection.getPath()).isPresent()) {
            if (remoteCollection.getHiddenDisplayName().isPresent() && remoteCollection.getHiddenColor().isPresent()) {
              localStore.addCollection(remoteCollection.getPath(),remoteCollection.getHiddenDisplayName().get(),remoteCollection.getHiddenColor().get());
            }
 else             if (remoteCollection.getHiddenDisplayName().isPresent())             localStore.addCollection(remoteCollection.getPath(),remoteCollection.getHiddenDisplayName().get());
 else             localStore.addCollection(remoteCollection.getPath());
          }
        }
 catch (        IOException e) {
          handleException(getContext(),e,syncResult);
        }
catch (        PropertyParseException e) {
          handleException(getContext(),e,syncResult);
        }
catch (        RemoteException e) {
          handleException(getContext(),e,syncResult);
        }
catch (        InvalidMacException e) {
          handleException(getContext(),e,syncResult);
        }
catch (        GeneralSecurityException e) {
          handleException(getContext(),e,syncResult);
        }
      }
    }
    for (    LocalEventCollection localCollection : localStore.getCollections()) {
      Log.d(TAG,"String_Node_Str" + localCollection.getPath());
      Optional<HidingCalDavCollection> remoteCollection=remoteStore.getCollection(localCollection.getPath());
      if (remoteCollection.isPresent())       new CalendarSyncWorker(getContext(),localCollection,remoteCollection.get()).run(syncResult,false);
 else {
        Log.d(TAG,"String_Node_Str");
        localStore.removeCollection(localCollection.getPath());
      }
    }
    finalizeCopiedCalendars(localStore,remoteStore);
    remoteStore.releaseConnections();
  }
 catch (  IOException e) {
    handleException(getContext(),e,syncResult);
  }
catch (  DavException e) {
    handleException(getContext(),e,syncResult);
  }
catch (  PropertyParseException e) {
    handleException(getContext(),e,syncResult);
  }
catch (  RemoteException e) {
    handleException(getContext(),e,syncResult);
  }
catch (  GeneralSecurityException e) {
    handleException(getContext(),e,syncResult);
  }
  showNotifications(syncResult);
  new CalendarsSyncScheduler(getContext()).setTimeLastSync(new Date().getTime());
}