Аннотация JPA @Embedded помечена как ошибка в netbeans

В NETBEANS

ошибка отображается в строке 2:

 @Embedded    
    public SchoolDetails getSchoolDetails() {
    return schoolDetails;
     }

Базовые атрибуты могут быть только следующих типов: примитивные типы Java, оболочка примитивных типов, String, java.math.BigInteger, java.math.BigDecimal, java.util.Date, java.util.Calendar, java.sql.Date , java.sql.Time, java.sql.TimeStamp, byte[], Byte[], char[], Character[], перечисления или любой сериализуемый тип. встроенный

обратите внимание, что следующие классы

package com.chapter3;

import java.io.Serializable;
import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;


@Entity
public class School  {

    private int schoolId;
    private String schooleName;
    private SchoolDetails schoolDetails;

    @Embedded    
    public SchoolDetails getSchoolDetails() {
        return schoolDetails;
    }

    public void setSchoolDetails(SchoolDetails schoolDetails) {
        this.schoolDetails = schoolDetails;
    }

    @Id
    @GeneratedValue
    public int getSchoolId() {
        return schoolId;
    }

    public void setSchoolId(int schoolId) {
        this.schoolId = schoolId;
    }

    public String getSchooleName() {
        return schooleName;
    }

    public void setSchooleName(String schooleName) {
        this.schooleName = schooleName;
    }
}

package com.chapter3;

import javax.persistence.Embeddable;

@Embeddable
public class SchoolDetails {

    private String schoolAddress;
    private boolean isPublicSchool;
    private int studentCount;

    public boolean isIsPublicSchool() {
        return isPublicSchool;
    }

    public void setIsPublicSchool(boolean isPublicSchool) {
        this.isPublicSchool = isPublicSchool;
    }

    public String getSchoolAddress() {
        return schoolAddress;
    }

    public void setSchoolAddress(String schoolAddress) {
        this.schoolAddress = schoolAddress;
    }

    public int getStudentCount() {
        return studentCount;
    }

    public void setStudentCount(int studentCount) {
        this.studentCount = studentCount;
    }
}