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  1. ,

    The easiest solution is to provide a default constructor for the class you want to convert from/to json.

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    Expert tip

    Try indicating constructor to use @JsonCreator annotation.

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com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of com.test.SwissProt: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)
at [Source: [B@681c6d54; line: 1, column: 12]	at com.fasterxml.jackson.databind.JsonMappingException.from(	at com.fasterxml.jackson.databind.DeserializationContext.instantiationException(	at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(	at com.fasterxml.jackson.databind.ObjectMapper.readValue(	at com.test.SwissProtDeserializationSchema.deserialize(SwissProtDeserializationSchema.scala:17)	at com.test.SwissProtDeserializationSchema.deserialize(SwissProtDeserializationSchema.scala:9)	at org.apache.flink.streaming.util.serialization.KeyedDeserializationSchemaWrapper.deserialize(	at	at