public void addStudent(Student student)
        {
            if (this.student == null)
                this.student = new ArrayList<Student>();
            this.student.add(student);
        }
Test ser/deser of graph objects (references and cyclic dependencies) with runtime schemas.

@author David Yu
@created Jan 19, 2011
protostuff-runtime/src/test/java/io/protostuff/runtime/RuntimeGraphTest.java