org.springframework.data.mapping.MappingException: Cannot convert type class java.util.ArrayList into an instance of class java.lang.Object

Question

Getting this error on retrieving data from database (MongoDB driver V3.10.2, springboot V2.0, spring cloud V-Finchley.M9).

Recently we have upgraded the springboot version from 1.3 to 2.0 and mongodb driver to latest once. Before upgrading this code was working but now it suddenly stopped working.

Java Class POJO:

public class Positions {
        private String type ="Polygon";
        private List<List<List<Double>>> coordinates;

        public List<List<List<Double>>> getCoordinates() {
            return coordinates;
        }

        public void setCoordinates(List<List<List<Double>>> coordinates) {
            this.coordinates = coordinates;
        }

        public String getType() {
            return type;
        }

        public void setType(String type) {
            this.type = type;
        }
    }

MongoDB data, which I am trying to map:

"positionsFrom" : {
        "type" : "Polygon",
        "coordinates" : [ 
            [ 
                [ 
                    13.9092758594177, 
                    44.8984249954859
                ], 
                [ 
                    13.921764224591, 
                    44.8985769926884
                ], 
                [ 
                    13.9218071399353, 
                    44.901373669501
                ], [ 
                    13.9092758594177, 
                    44.8984249954859
                ]
            ]
     ]
}

The error log:

org.springframework.data.mapping.MappingException: Cannot convert [14.245518205126928, 50.112434905459665] of type class java.util.ArrayList into an instance of class java.lang.Object! Implement a custom Converter<class java.util.ArrayList, class java.lang.Object> and register it with the CustomConversions. Parent object was: ClassPojo [direction = null, originCity = null, destinationCity = null, effectiveStartDate = 2019-04-11, effectiveEndDate = 2019-12-28, destination = null, currency = com.darwin.domain.model.Currency@490a218f, routeNumber = null, pickUp = null, _id = 5cb56d7db04d6442ad1ec487, adultRate = null, childRate = null, vehicleType = null, capacity = null] -> com.darwin.domain.localTransfers.LocalTransfer$Positions@77c9fddd
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readCollectionOrArray(MappingMongoConverter.java:980)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readCollectionOrArray(MappingMongoConverter.java:985)
    at

Any Stack trace ? And pom file

AchillesVan
– AchillesVan

2019-08-09 13:10:44 +00:00
Commented Aug 9, 2019 at 13:10 — AchillesVan
– AchillesVan, Commented Aug 9, 2019 at 13:10
error log please

jagapathi
– jagapathi

2019-08-09 13:11:42 +00:00
Commented Aug 9, 2019 at 13:11 — jagapathi
– jagapathi, Commented Aug 9, 2019 at 13:11
Provide the error log?

Akash
– Akash

2019-08-09 13:14:03 +00:00
Commented Aug 9, 2019 at 13:14 — Akash
– Akash, Commented Aug 9, 2019 at 13:14
Hi.. i have added error logs in edited question

Kiran Mungekar
– Kiran Mungekar

2019-08-10 06:53:03 +00:00
Commented Aug 10, 2019 at 6:53 — Kiran Mungekar
– Kiran Mungekar, Commented Aug 10, 2019 at 6:53

Khalid Shaikh · Accepted Answer · 2019-08-17 08:44:04Z

1

Use org.springframework.data.mongodb.core.convert Customconversions instead of Mongocustomcoversions. There is no need to write extra conversion but remember old Customconversions is deprecated. This is quick fix.

answered Aug 17, 2019 at 8:44

Khalid Shaikh

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