使用Java注解+MySQL实现@OneToOne表关联时遇JAXB异常求助

开发者阿泽

2026-8-21

Hibernate @OneToOne关联时JAXB加载配置文件异常问题

我在MySQL中创建了instructor和instructor_detail两张表，尝试用@OneToOne注解实现表关联，但运行CreateDemo类时抛出异常。错误核心是JAXB相关的sun.misc.Unsafe.defineClass方法不存在，进而引发NullPointerException，异常发生在SessionFactory加载hibernate.cfg.xml的环节。

完整错误栈

Aug 24, 2022 5:53:06 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.2.11.Final}
Aug 24, 2022 5:53:07 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Aug 24, 2022 5:53:07 PM com.sun.xml.bind.v2.runtime.reflect.opt.Injector <clinit>
SEVERE: null
java.security.PrivilegedActionException: java.lang.NoSuchMethodException: sun.misc.Unsafe.defineClass(java.lang.String,[B,int,int,java.lang.ClassLoader,java.security.ProtectionDomain)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:573)
    at com.sun.xml.bind.v2.runtime.reflect.opt.Injector.<clinit>(Injector.java:197)
    at com.sun.xml.bind.v2.runtime.reflect.opt.AccessorInjector.prepare(AccessorInjector.java:81)
    at com.sun.xml.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.get(OptimizedAccessorFactory.java:179)
    at com.sun.xml.bind.v2.runtime.reflect.Accessor$FieldReflection.optimize(Accessor.java:285)
    at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.<init>(SingleElementNodeProperty.java:94)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
    at com.sun.xml.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:128)
    at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:181)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:514)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:331)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:139)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1156)
    at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:165)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:297)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:286)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:409)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:721)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:662)
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:122)
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:65)
    at org.hibernate.boot.cfgxml.internal.ConfigLoader.loadConfigXmlResource(ConfigLoader.java:57)
    at org.hibernate.boot.registry.StandardServiceRegistryBuilder.configure(StandardServiceRegistryBuilder.java:163)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:258)
    at com.mandeep.hibernate.demo.CreateDemo.main(CreateDemo.java:15)
Caused by: java.lang.NoSuchMethodException: sun.misc.Unsafe.defineClass(java.lang.String,[B,int,int,java.lang.ClassLoader,java.security.ProtectionDomain)
    at java.base/java.lang.Class.getMethod(Class.java:2227)
    at com.sun.xml.bind.v2.runtime.reflect.opt.Injector$3.run(Injector.java:201)
    at com.sun.xml.bind.v2.runtime.reflect.opt.Injector$3.run(Injector.java:197)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:569)
    ... 32 more

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.lang.reflect.Method.invoke(Object, Object[])" because "com.sun.xml.bind.v2.runtime.reflect.opt.Injector.defineClass" is null
    at com.sun.xml.bind.v2.runtime.reflect.opt.Injector.inject(Injector.java:311)
    at com.sun.xml.bind.v2.runtime.reflect.opt.Injector.inject(Injector.java:97)
    at com.sun.xml.bind.v2.runtime.reflect.opt.AccessorInjector.prepare(AccessorInjector.java:87)
    at com.sun.xml.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.get(OptimizedAccessorFactory.java:179)
    at com.sun.xml.bind.v2.runtime.reflect.Accessor$FieldReflection.optimize(Accessor.java:285)
    at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.<init>(SingleElementNodeProperty.java:94)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
    at com.sun.xml.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:128)
    at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:181)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:514)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:331)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:139)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1156)
    at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:165)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:297)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:286)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:409)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:721)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:662)
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:122)
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:65)
    at org.hibernate.boot.cfgxml.internal.ConfigLoader.loadConfigXmlResource(ConfigLoader.java:57)
    at org.hibernate.boot.registry.StandardServiceRegistryBuilder.configure(StandardServiceRegistryBuilder.java:163)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:258)
    at com.mandeep.hibernate.demo.CreateDemo.main(CreateDemo.java:15)

CreateDemo主类代码

package com.mandeep.hibernate.demo;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

import com.mandeep.hibernate.demo.entity.Instructor;
import com.mandeep.hibernate.demo.entity.InstructorDetail;

public class CreateDemo {

    public static void main(String[] args) {
        
        SessionFactory factory = new Configuration()
                                .configure("hibernate.cfg.xml")
                                .addAnnotatedClass(Instructor.class)
                                .addAnnotatedClass(InstructorDetail.class)
                                .buildSessionFactory();
        
        Session session = factory.getCurrentSession();
        
        try {
            
            // 创建对象
            Instructor tempInstructor = 
                    new Instructor("Meenakshi","Sharma","ABC@gmail.com");
            
            InstructorDetail tempInstructorDetail = 
                    new InstructorDetail("www.youtube.com","Art");
            
            // 关联对象
            tempInstructor.setInstructorDetail(tempInstructorDetail);
            
            // 开启事务
            session.beginTransaction();
            
            // 保存讲师
            System.out.println("Saving Instructor " + tempInstructor);
            session.save(tempInstructor);
            
            // 提交事务
            session.getTransaction().commit();
            
            
            
        }
        finally {
            factory.close();
            
        }
    }

}

hibernate.cfg.xml配置文件

<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- JDBC数据库连接设置 -->
        <property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/hb-01-one-to-one-uni?useSSL=false&amp;serverTimezone=UTC</property>
        <property name="connection.username">hbstudent</property>
        <property name="connection.password">hbstudent</property>

        <!-- JDBC连接池设置...使用内置测试池 -->
        <property name="connection.pool_size">1</property>

        <!-- 选择SQL方言 -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- 将SQL输出到控制台 -->
        <property name="show_sql">true</property>

        <!-- 设置当前会话上下文 -->
        <property name="current_session_context_class">thread</property>
 
    </session-factory>

</hibernate-configuration>

Instructor实体类代码

package com.mandeep.hibernate.demo.entity;

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

@Entity
@Table(name="instructor")
public class Instructor {
    
    @OneToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="instructor_detail_id")
    private InstructorDetail instructorDetail;  
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id")
    private int id;
    
    @Column(name="first_name")
    private String firstName;
    
    @Column(name="last_name")
    private String lastName;
    
    @Column(name="email")
    private String email;
    
    public Instructor() {
        
    }

    public Instructor(String firstName, String lastName, String email) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

    public InstructorDetail getInstructorDetail() {
        return instructorDetail;
    }

    public void setInstructorDetail(InstructorDetail instructorDetail) {
        this.instructorDetail = instructorDetail;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

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

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Instructor [instructorDetail=" + instructorDetail + ", id=" + id + ", firstName=" + firstName
                + ", lastName=" + lastName + ", email=" + email + "]";
    }

}

InstructorDetail实体类代码

package com.mandeep.hibernate.demo.entity;

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="instructor_detail")
public class InstructorDetail {
    
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="id")
    private int id;
    
    @Column(name="youtube_channel")
    private String youtubeChannel;
    
    @Column(name="hobby")
    private String hobby;

    public InstructorDetail() {
        
    }

    public InstructorDetail(String youtubeChannel, String hobby) {
        this.youtubeChannel = youtubeChannel;
        this.hobby = hobby;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getYoutubeChannel() {
        return youtubeChannel;
    }

    public void setYoutubeChannel(String youtubeChannel) {
        this.youtubeChannel = youtubeChannel;
    }

    public String getHobby() {
        return hobby;
    }

    public void setHobby(String hobby) {
        this.hobby = hobby;
    }

    @Override
    public String toString() {
        return "InstructorDetail [id=" + id + ", youtubeChannel=" + youtubeChannel + ", hobby=" + hobby + "]";
    }

}

内容的提问来源于stack exchange，提问作者Mandeep

使用Java注解+MySQL实现@OneToOne表关联时遇JAXB异常求助

完整错误栈 #

CreateDemo主类代码 #

hibernate.cfg.xml配置文件 #

Instructor实体类代码 #

InstructorDetail实体类代码 #

完整错误栈

CreateDemo主类代码

hibernate.cfg.xml配置文件

Instructor实体类代码

InstructorDetail实体类代码