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## 3.4. Object Inheritance

POJO Cache preserves the inheritance hierarchy of all attached objects. For example, if a `Student` extends `Person` with an additional field `year`, then once `Student` is put into the cache, all the class attributes of `Person` are mapped to the cache as well.

Following is a code snippet that illustrates how the inheritance behavior of a POJO is maintained. Again, no special configuration is needed.

    import org.jboss.test.cache.test.standAloneAop.Student;

    Student joe = new Student(); // Student extends Person class
    joe.setName("Joe Black"); // This is base class attributes
    joe.setAge(22); // This is also base class attributes
    joe.setYear("Senior"); // This is Student class attribute

    cache.attach("pojo/student/joe", joe);

    //...

    joe = (Student)cache.attach("pojo/student/joe");
    Person person = (Person)joe; // it will be correct here
    joe.setYear("Junior"); // will be intercepted by the cache
    joe.setName("Joe Black II"); // also intercepted by the cache

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