Caused by: java.lang.NullPointerException
   at org.hibernate.cfg.annotations.CollectionBinder.bindCollectionSecondPass(CollectionBinder.java:1456)
   at org.hibernate.cfg.annotations.CollectionBinder.bindOneToManySecondPass(CollectionBinder.java:864)
   at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:779)
   at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:728)
   at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:70)
   at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1695)
   at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1424)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1844)
   at com.test.ServletEventListener.buildSessionFactory(ServletEventListener.java:61)
   at com.test.ServletEventListener.contextInitialized(ServletEventListener.java:27)

package com.cabintechglobal.pdir.model;

import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;

import com.fasterxml.jackson.annotation.JsonManagedReference;

@Entity
@Table(name="PERSON")
public class Person {
   
   //----- Columns
   
   @Id 
   @GeneratedValue(strategy=GenerationType.IDENTITY)
   @Column(nullable=false, unique=true)
   private int personId;
   
   @Column(nullable=false, length=50)
   private String firstName;
   
   @OneToMany(fetch=FetchType.LAZY, cascade=CascadeType.ALL)
   @JoinColumn(referencedColumnName="phoneId") // Column in PHONE table
   private Set<Phone> phoneList;
   
   //---- Getters/Setters

   public int getPersonId() {
      return personId;
   }

   public void setPersonId(int personId) {
      this.personId = personId;
   }

   public String getFirstName() {
      return firstName;
   }

   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }


      public Set<Phone> getPhoneList() {
      return phoneList;
   }

   public void setPhoneList(Set<Phone> phoneList) {
      this.phoneList = phoneList;
   }
   
}

package com.cabintechglobal.pdir.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="PHONE")
public class Phone {

   //----- Columns
   
   @Id 
   @GeneratedValue(strategy=GenerationType.IDENTITY)
   @Column(nullable=false, unique=true)
   private int phoneId;
   
   @Column(nullable=true, length=10)
   private String number;
   
   @Column(nullable=true, length=10)
   private String extension;
   
   @Column(nullable=true, length=15)
   private String type;
   
   //---- Getters/Setters

   public int getPhoneId() {
      return phoneId;
   }

   public void setPhoneId(int phoneId) {
      this.phoneId = phoneId;
   }

   public String getNumber() {
      return number;
   }

   public void setNumber(String number) {
      this.number = number;
   }

   public String getExtension() {
      return extension;
   }

   public void setExtension(String extension) {
      this.extension = extension;
   }

   public String getType() {
      return type;
   }

   public void setType(String type) {
      this.type = type;
   }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.org/dtd/hibernate-configuration-3.0.dtd">
       
<hibernate-configuration> 
 
    <session-factory> 
 
        <!-- Database connection settings --> 
        <property name="connection.driver_class">org.apache.derby.jdbc.EmbeddedDriver</property> 
        <property name="connection.url">jdbc:derby:Databases/TestDB;create=true</property> 
        <property name="connection.username"></property> 
        <property name="connection.password"></property> 
 
        <!-- SQL dialect --> 
        <property name="dialect">org.hibernate.dialect.DerbyDialect</property> 
 
        <!-- JDBC connection pool (use the built-in) --> 
        <!--property name="connection.pool_size">1</property--> 
 
        <!-- Echo all executed SQL to stdout --> 
        <!--property name="show_sql">true</property--> 
 
        <!-- Create/update the database schema on startup --> 
        <property name="hbm2ddl.auto">update</property> 
 
        <mapping class="com.test.TestUser"></mapping> 
        <mapping class="com.cabintechglobal.pdir.model.Person"></mapping> 
        <mapping class="com.cabintechglobal.pdir.model.StaffDetail"></mapping> 
        <mapping class="com.cabintechglobal.pdir.model.Phone"></mapping> 
 
    </session-factory> 
 
</hibernate-configuration> 

        // Create the SessionFactory from hibernate.cfg.xml
        Configuration configuration = new Configuration();
        configuration.configure("hibernate.cfg.xml");
        System.out.println("Hibernate Annotation Configuration loaded");
         
        ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
        System.out.println("Hibernate Annotation serviceRegistry created");
         
        SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
         
        return sessionFactory;