package org.literacyapp.model.contributor;
import java.util.Calendar;
<BUG>import javax.persistence.Entity;
import javax.persistence.ManyToOne;
import javax.persistence.Temporal;</BUG>
import javax.persistence.TemporalType;
import javax.validation.constraints.NotNull;

package org.literacyapp.model.contributor;
import java.util.Calendar;
import javax.persistence.ManyToOne;
import javax.persistence.MappedSuperclass;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.validation.constraints.NotNull;
