Exception while inserting data in Ignite

[Arpit Jain]

Hi,

I am running Ignite in Server mode with my application. I am able to insert
the first record in the Key/Value Map in Ignite but it fails when I try
second time. The key is just a Long and value is simple class like this:

class A implements Serializable {


        private static final long serialVersionUID = 1L;


        protected Operation op;  //Enum


        protected String someStr;


        public A(Operation op, String someStr) {

            this.op = op;

            this.someStr = someStr;

        }


        public String toString() {

            StringBuilder builder = new StringBuilder(op.toString()).append(
"-").append(someStr);

            return builder.toString();

        }

    }


I am getting exception "*Failed to deserialise object
[typeName=BinaryTreeMap]"* while trying to insert second entry in Map
Any help appreciated !

Thanks