Unable to deserialize response exception

[san3ani]

Hello I have to bots running using the same exact code. One of them is working fine with no issues However the other bot was fine and then suddenly is given this exception Oct 30, 2018 8:17:53 AM org.telegram.telegrambots.logging.BotLogger severe SEVERE: BOTSESSION org.telegram.telegrambots.exceptions.TelegramApiRequestException: Unable to deserialize response at org.telegram.telegrambots.api.methods.updates.GetUpdates.deserializeResponse(GetUpdates.java:122) at org.telegram.telegrambots.updatesreceivers.DefaultBotSession$ReaderThread.getUpdatesFromServer(DefaultBotSession.java:262) at org.telegram.telegrambots.updatesreceivers.DefaultBotSession$ReaderThread.run(DefaultBotSession.java:191) Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token at [Source: java.io.StringReader@6b653d27; line: 2, column: 568] (through reference chain: org.telegram.telegrambots.api.objects.replykeyboard.ApiResponse["result"]->java.util.ArrayList[0]->org.telegram.telegrambots.api.objects.Update["message"]->org.telegram.telegrambots.api.objects.Message["sticker"]->org.telegram.telegrambots.api.objects.stickers.Sticker["mask_position"]) at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270) at com.fasterxml.jackson.databind.DeserializationContext.reportMappingException(DeserializationContext.java:1234) at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1122) at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1075) at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:60) at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:11) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:504) at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:108) at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:504) at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:108) at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:504) at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:108) at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:287) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:259) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:26) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:504) at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:108) at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3798) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2861) at org.telegram.telegrambots.api.methods.updates.GetUpdates.deserializeResponse(GetUpdates.java:114) ... 2 more

As I said both bots have the same exact code. However the bot with the error is in about 50 groups. The issue seems to be related to the JSON message received from telegram servers. Any idea what is causing this and how to solve it.

Thanks

[rubenlagus]

Can you post the exact JSON object that it is not able to deserialize? (You can anonymise some fields that contains sensitive information)

[aNNiMON]

This issue is reproducible when the bot receives a sticker with the mask position object. Telegram X can send masks as sticker: Settings - Sticker - Masks.

[san3ani]

Thanks a lot everyone. The problem suddenly disappeared. I guess what aNNiMON explained is the answer. Thanks a lot