面临休眠错误：引起：java.lang.ClassNotFoundException：net.bytebuddy.NamingStrategy$SuffixingRandom$BaseNameResolver

Question

在 Eclipse 中运行此代码时出现错误。我已经创建了Student.java文件：

public class Student {
    private int id;
    private String name;
    private String email;
    private int marks;
    
    // getters/setters
}

我已经创建了Student.hbm.xml文件：

<!DOCTYPE hibernate-mapping PUBLIC 
     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
     "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
          
    <hibernate-mapping>
    <class name="bean.Student" table="student">
            <id name="id" column="sid"></id>
            <property name="name"  column="sname"></property>
            <property name="email" column="semail"></property>
            <property name="marks" column="smarks"></property>
    </class>
    </hibernate-mapping>

我已经创建了hibernate.cfg.xml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>
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:wind</property>
        <property name="connection.username">localuser</property>
        <property name="connection.password">localuser</property>
        <property name="connection.poolsize">5</property>
            
        <property name="dialect">org.hibernate.dialect.OracleDialect</property>
            
        <mapping resource="resources/student.hbm.xml"/>
            
    </session-factory>
    </hibernate-configuration>

我已经创建了client.java文件：

    package testclass;
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.cfg.Configuration;
    import bean.Student;
    
    public class Client {
    public static void main(String[] args) {
        
        Student st = new Student();
        st.setId(11);
        st.setEmail("swapnilgthaware@gmail.com");
        st.setMarks(98);
        st.setName("Swapnil");  
        
        // Student object is transient here..
        // When it is attached to hibernate object then it will become persistent object.
        
        
        Configuration cfg = new Configuration();
        cfg.configure("resources/hibernate.cfg.xml");
        
        SessionFactory sf = cfg.buildSessionFactory();
        Session s =sf.openSession();
        
        s.save(st);
        
        // Student object is persisten now. Even gc() will not take away this object
        
        s.beginTransaction().commit();
        // Student object will goto Database side.
        
        s.evict(st);
    }
}

我尝试添加许多 jars 文件，但在我的 oracle 数据库中看不到学生记录。

完整错误：

    Jul 17, 2018 8:11:09 PM org.hibernate.Version logVersion
    INFO: HHH000412: Hibernate Core {5.3.2.Final}
    Jul 17, 2018 8:11:09 PM org.hibernate.cfg.Environment <clinit>
    INFO: HHH000206: hibernate.properties not found
    Exception in thread "main" java.lang.NoClassDefFoundError: net/bytebuddy/NamingStrategy$SuffixingRandom$BaseNameResolver
        at org.hibernate.cfg.Environment.buildBytecodeProvider(Environment.java:357)
        at org.hibernate.cfg.Environment.buildBytecodeProvider(Environment.java:352)
        at org.hibernate.cfg.Environment.<clinit>(Environment.java:246)
        at org.hibernate.boot.registry.StandardServiceRegistryBuilder.<init>(StandardServiceRegistryBuilder.java:78)
        at org.hibernate.boot.registry.StandardServiceRegistryBuilder.<init>(StandardServiceRegistryBuilder.java:67)
        at org.hibernate.cfg.Configuration.reset(Configuration.java:158)
        at org.hibernate.cfg.Configuration.<init>(Configuration.java:124)
        at org.hibernate.cfg.Configuration.<init>(Configuration.java:118)
        at testclass.Client.main(Client.java:21)
    Caused by: java.lang.ClassNotFoundException: net.bytebuddy.NamingStrategy$SuffixingRandom$BaseNameResolver
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 9 more

Answer 1

我对这个库有同样的问题。

在 Java 构建路径（项目属性）中，您是否将 jar 文件添加到模块路径或类路径？我最初在 Modulepath 下添加了 jars。在调试问题时，我决定将 jars 移到 Classpath 中。这解决了问题。

另一种选择是将项目转换为 Maven 项目

1. 右键单击包资源管理器中的项目名称

2. 向下滚动到配置

3. 选择转换为 Maven 项目

4. 接受所有默认值并单击完成

Answer 2

我有同样的问题：原来网络伙伴库文件已损坏（下载过程中出错？）。

尝试删除 ~/.m2/repository/net/bytebuddy 中的 jars 并重建应用程序。

希望这可以帮助。