Facing hibernate error: Caused by: java.lang.ClassNotFoundException: net.bytebuddy.NamingStrategy$SuffixingRandom$BaseNameResolver

Question

I am getting an error while running this code in Eclipse. I have created Student.java file:

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

I have created Student.hbm.xml file:

<!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>

I have created hibernate.cfg.xml file:

 <!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>

I have created client.java file:

    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("[email protected]");
        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);
    }
}

I tried adding many jars file but I am unable see student record in my oracle database.

Full error:

    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

I had the same problem with this library.

In the Java Build Path (Project Properties ) did you add the jar files to the Modulepath or to the Classpath ? I initially added the jars under the Modulepath. While debugging the issue I decided to move the jars into the Classpath . This resolved the problem.

Another option is to convert the project to a Maven project

1. Right click the project name in the package explorer

2. Scroll down to Configure

3. Select Convert to Maven project

4. Accept all the defaults and click on Finish

Answer 2

I have the same problem: turns out the net-buddy library file was corrupted (error during download?).

Try deleting jars in ~/.m2/repository/net/bytebuddy and rebuild the application.

Hope this helps.