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How to create composite keys in entity class for spring data neo4j ?

import org.springframework.data.neo4j.core.schema.Id;
import org.springframework.data.neo4j.core.schema.Node;
import org.springframework.data.neo4j.core.schema.Property;


@Node("customer")
public class Customer {

    @Id
    @Property("mobnumber")
    private String mobnumber;

    @Id
    @Property("accnumber")
    private String accnumber;
 when i am trying to create composite keys with two @id I am getting the following error.
org.springframework.data.mapping.MappingException: Attempt to add id property private java.lang.String com.tmo.chub.entity.Customer.accnumber but already have property private java.lang.String com.tmo.chub.entity.Customer.mobnumber registered as id. Check your mapping configuration!
 
How can i define composite keys in entity class for spring data neo4j ?
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