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  1. ,
    Expert tip

    Try indicating constructor to use @JsonCreator annotation.

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

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com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class com.example.mick.drivers6.Driver] from String value; no single-String constructor/factory method	at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator._createFromStringFallbacks(StdValueInstantiator.java:428)	at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromString(StdValueInstantiator.java:299)	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromString(BeanDeserializerBase.java:1056)	at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:136)	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:123)	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034)	at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:183)	at com.example.mick.drivers6.MainActivity$1$1.onDataChange(MainActivity.java:68)	at com.firebase.client.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:45)	at com.firebase.client.core.view.DataEvent.fire(DataEvent.java:45)	at com.firebase.client.core.view.EventRaiser$1.run(EventRaiser.java:38)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5254)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)