Here is an example of a custom UnsupportedTypeDeserializer class in Java using the com.fasterxml.jackson.databind package:

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;

public class UnsupportedTypeDeserializer extends StdDeserializer<UnsupportedType> {

    public UnsupportedTypeDeserializer() {
        super(UnsupportedType.class);
    }

    @Override
    public UnsupportedType deserialize(JsonParser p, DeserializationContext ctxt) {
        // custom deserialization logic
        // ...
    }
}

In this example, UnsupportedType is a custom class that is not supported by the default Jackson deserializers. By extending StdDeserializer and overriding the deserialize method, you can provide custom deserialization logic for instances of UnsupportedType.