AnnotationConfiguration和Configuration混用时出错

Teacher类：

package org.zxy.model;import java.util.Date;import javax.persistence.Basic;import javax.persistence.Entity;import javax.persistence.Id;import javax.persistence.Table;import javax.persistence.Temporal;import javax.persistence.TemporalType;import javax.persistence.Transient;@Entitypublic class Teacher {private int id;private String name;private String title;private Date birthday;@Basic@Temporal(TemporalType.TIME)public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}@Idpublic int getId() {return id;}public void setId(int id) {this.id = id;}@Basicpublic String getName() {return name;}public void setName(String name) {this.name = name;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}} 

Student类：

package org.zxy.model;import java.util.Date;public class Student {private String id;private String name;private int age;private Date birthday;public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public Student() {}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}} 

用JUnit测试：

TeacherTest:

package org.zxy.model;import java.util.Date;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.AnnotationConfiguration;import org.junit.AfterClass;import org.junit.BeforeClass;import org.junit.Test;public class TeacherTest {private static SessionFactory sf = null;@BeforeClasspublic static void beforeClass() {sf = new AnnotationConfiguration().configure().buildSessionFactory();}@Testpublic void save(){Teacher t = new Teacher();t.setId(4);t.setName("zhangsan");t.setTitle("chuji");t.setBirthday(new Date());Session session = sf.openSession();session.beginTransaction();session.save(t);session.getTransaction().commit();session.close();}@AfterClasspublic static void afterClass() {sf.close();}} 

StudentTest:

package org.zxy.model;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;import org.junit.AfterClass;import org.junit.BeforeClass;import org.junit.Test;public class StudentTest {public static SessionFactory sf = null;@BeforeClasspublic static void beforeClass() {sf = new Configuration().configure().buildSessionFactory();}@Testpublic void save() {Student stu = new Student();stu.setName("wangwu");stu.setAge(4);Session session = sf.openSession();session.beginTransaction();session.save(stu);session.getTransaction().commit();session.close();}@AfterClasspublic static void afterClass() {sf.close();}} 

hibernate.cfg.xml:

<?xml version='1.0' encoding='utf-8'?><!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <property name="connection.url">jdbc:oracle:thin:@localhost:1521:zxy</property> <property name="connection.username">scott</property> <property name="connection.password">tiger</property> <!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.OracleDialect</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <property name="format_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hbm2ddl.auto">update</property> <mapping resource="org/zxy/model/Student.hbm.xml"/> <mapping class="org.zxy.model.Teacher"/> <mapping class="org.zxy.model.Person"/> </session-factory></hibernate-configuration> 

测试StudentTest时，会出现new Configuration()得不到值，出现空指针

改为AnnotationConfiguration()即刻解决问题