This is the employee class required to do the examples at http://mongodb.github.io/morphia/1.0/getting-started/quick-tour/

MorphiaGettingStartedEmployees.java

package com.mattdalesio.morphiaTesting;

import java.util.ArrayList;
import java.util.List;

import org.bson.types.ObjectId;
import org.mongodb.morphia.annotations.*;

@Entity("employees")
@Indexes(
    @Index(value = "salary", fields = @Field("salary"))
)
class Employee {
	@Id
    private ObjectId id;
    private String name;
    @Reference
    private Employee manager;
    @Reference
    private List<Employee> directReports = new ArrayList<Employee>();
    @Property("wage")
    private Double salary;
    
	public Employee(){
		
	}
	
    public Employee(String name, double salary) {
		this.name = name;
		this.salary = salary;
	}
    
	@Override
	public String toString() {
		return "Employee [id=" + id + ", name=" + name + ", manager=" + manager
				+ ", directReports=" + directReports + ", salary=" + salary
				+ "]";
	}

	public List<Employee> getDirectReports() {
		return directReports;
	}
    
}