Question

Product.java

public class Product {
    private int productId;
    private String proName;
    private double price;

    public void setProductId(int productId)
    {
        this.productId = productId;
    }
    public int getProductId()
    {
        return productId;
    }

    public void setProName(String proName)
    {
        this.proName = proName;
    }
    public String getProName()
    {
        return proName;
    }

    public void setPrice(double price)
    {
        this.price = price;
    }
    public double getPrice()
    {
        return price;
    }
}

Product.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Product" table="PRODUCTS">

<id name="productId" column="pid"  >
<generator class="assigned" />
</id>

<property name="proName" column="pname" />
<property name="price"/>

</class>
</hibernate-mapping>

的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>

<!-- Related to the connection START -->
<property name="connection.driver_class">org.postgresql.Driver
</property>
<property name="connection.url">jdbc:postgresql://localhost:5432/hibernatedb</property>
<property name="connection.username">postgres</property>
<property name="connection.password">paris</property>
<!-- Related to the connection END -->

<!-- Related to hibernate properties START -->
<property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<!-- Related to hibernate properties END -->

<!-- Related to mapping START -->
<mapping resource="product.hbm.xml" />
<!-- Related to the mapping END -->

</session-factory>
</hibernate-configuration>

ClientForSave.java

import org.hibernate.*;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.*;


public class ClientForSave { 


    public static void main(String[] args)
    {

        Configuration cfg = new Configuration();
        cfg.configure(); 
        StandardServiceRegistryBuilder builder=new StandardServiceRegistryBuilder().applySettings(cfg.getProperties());
        SessionFactory factory=cfg.buildSessionFactory(builder.build());
        Session session = factory.openSession();
        Product p=new Product();

        p.setProductId(101);
        p.setProName("iPhone");
        p.setPrice(25000);

        Transaction tx = session.beginTransaction();
        session.save(p);
        System.out.println("Object saved successfully.....!!");
        tx.commit();
        session.close();
        factory.close();
    }

}

控制台输出错误＆gt;＆gt;＆gt;

Exception in thread "main" java.lang.NoClassDefFoundError: org/hibernate/annotations/common/reflection/MetadataProvider
    at ClientForSave.main(ClientForSave.java:12)
Caused by: java.lang.ClassNotFoundException: org.hibernate.annotations.common.reflection.MetadataProvider
    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)
    ... 1 more

P lease解决这个问题。因为10天我试图编写像这样的hibernate示例应用程序每次它都显示我的错误..我只是一个初学者.i请求你们请解决这个并以简单的方式解释我..谢谢你的所有建议

Answer 1

异常实际上是告诉你问题是什么：

java.lang.NoClassDefFoundError: org/hibernate/annotations/common/reflection/MetadataProvider

在运行时，它找不到类org.hibernate.annotations.common.reflection.MetadataProvider。您需要在应用程序的类路径中提供具有此类的jar。我不知道你的设置是什么样的，但是从你得到你的hibernate-core-4.3.1.Final.jar的同一个源码，你应该能得到一个hibernate-commons-annotations-4.0.4.Final .jar（假设您使用的是最新版本）。检索它，将它放入类路径中，异常就会消失。

无法通过Hibernate连接到数据库...太令人沮丧

1 个答案: