无法初始化类 util.HibernateUtil。

huangapple
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英文:

Could not initialize class util.HibernateUtil

问题

我尝试运行WS时遇到了这个错误
找不到任何解决方案，如果有人可以帮助我

在Netbeans上运行Hibernate 4.3

HibernateUtil.java

  1. import org.hibernate.SessionFactory;
  2. import org.hibernate.cfg.Configuration;
  4. public class HibernateUtil {
  6.     private static final SessionFactory sessionFactory;
  7.     
  8.     static {
  9.         try {
  10.             // 从标准配置文件（hibernate.cfg.xml）创建SessionFactory。
  11.             sessionFactory = new Configuration().configure().buildSessionFactory();
  12.         } catch (Throwable ex) {
  13.             // 记录异常。
  14.             System.err.println("初始化SessionFactory失败。" + ex);
  15.             throw new ExceptionInInitializerError(ex);
  16.         }
  17.     }
  18.     
  19.     public static SessionFactory getSessionFactory() {
  20.         return sessionFactory;
  21.     }
  22. }

hibernate.cfg.xml

  1. <hibernate-configuration>
  2.     <session-factory>
  3.         <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
  4.         <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
  5.         <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/vendas?useTimeZone=true;useSSL=false;serverTimezone=UTC;autoReconnect=true</property>
  6.         <property name="hibernate.connection.username">root</property>
  7.         <property name="hibernate.connection.password">root</property>
  8.         <mapping class="entity.Cliente"/>
  9.     </session-factory>
  10. </hibernate-configuration>

ClienController.java

  1. package api;
  3. import entity.Cliente;
  4. import java.util.List;
  5. import javax.ws.rs.Produces;
  6. import javax.ws.rs.GET;
  7. import javax.ws.rs.Path;
  8. import javax.ws.rs.PathParam;
  9. import javax.ws.rs.core.Context;
  10. import javax.ws.rs.core.MediaType;
  11. import javax.ws.rs.core.UriInfo;
  12. import org.hibernate.Query;
  13. import org.hibernate.Session;
  14. import util.HibernateUtil;
  16. @Path("clientes")
  17. public class ClientController {
  18.     
  19.     @Context
  20.     private UriInfo context;
  21.     
  22.     public ClientController() {
  23.         
  24.     }
  25.     
  26.     @GET
  27.     @Produces(MediaType.APPLICATION_JSON)
  28.     public String getTeste() {
  29.         
  30.         Cliente c = new Cliente();
  31.         Session session = HibernateUtil.getSessionFactory().openSession();
  32.         session.beginTransaction();
  33.         
  34.         Query select = session.createQuery("from Cliente");
  35.         List<Cliente> objetos = select.list();
  36.         
  37.         objetos.forEach(item -> {
  38.            System.out.println("name: " + item.getNomeCliente()); 
  39.         });
  40.         
  41.         return "";
  42.     }
  43. }

也许服务器上缺少一些JAR包？
运行在GlassFish 4.1.1上

服务器返回以下消息

  1. org.glassfish.jersey.server.ContainerException: java.lang.NoClassDefFoundError: Could not initialize class util.HibernateUtil

请帮我解决这个问题，谢谢。

英文:

I'm getting this error when I try to run my WS
Couldn't find any solutions, if anyone could help me

Running Hibernate 4.3 on Netbeans

HibernateUtil.java

  1. import org.hibernate.SessionFactory;
  2. import org.hibernate.cfg.Configuration;
  4. public class HibernateUtil {
  6.     private static final SessionFactory sessionFactory;
  7.     
  8.     static {
  9.         try {
  10.             // Create the SessionFactory from standard (hibernate.cfg.xml) 
  11.             // config file.
  12.             sessionFactory = new Configuration().configure().buildSessionFactory();
  13.         } catch (Throwable ex) {
  14.             // Log the exception. 
  15.             System.err.println(&quot;Initial SessionFactory creation failed.&quot; + ex);
  16.             throw new ExceptionInInitializerError(ex);
  17.         }
  18.     }
  19.     
  20.     public static SessionFactory getSessionFactory() {
  21.         return sessionFactory;
  22.     }
  23. }

hibernate.cfg.xml

  1. &lt;hibernate-configuration&gt;
  2.     &lt;session-factory&gt;
  3.         &lt;property name=&quot;hibernate.dialect&quot;&gt;org.hibernate.dialect.MySQLDialect&lt;/property&gt;
  4.         &lt;property name=&quot;hibernate.connection.driver_class&quot;&gt;com.mysql.jdbc.Driver&lt;/property&gt;
  5.         &lt;property name=&quot;hibernate.connection.url&quot;&gt;jdbc:mysql://localhost:3306/vendas?useTimeZone=true;useSSL=false;serverTimezone=UTC;autoReconnect=true&lt;/property&gt;
  6.         &lt;property name=&quot;hibernate.connection.username&quot;&gt;root&lt;/property&gt;
  7.         &lt;property name=&quot;hibernate.connection.password&quot;&gt;root&lt;/property&gt;
  8.         &lt;mapping class=&quot;entity.Cliente&quot;/&gt;
  9.     &lt;/session-factory&gt;
  10. &lt;/hibernate-configuration&gt;

ClienController.java

  1. /*
  2.  * To change this license header, choose License Headers in Project Properties.
  3.  * To change this template file, choose Tools | Templates
  4.  * and open the template in the editor.
  5.  */
  6. package api;
  8. import entity.Cliente;
  9. import java.util.List;
  10. import javax.ws.rs.Produces;
  11. import javax.ws.rs.GET;
  12. import javax.ws.rs.Path;
  13. import javax.ws.rs.PathParam;
  14. import javax.ws.rs.core.Context;
  15. import javax.ws.rs.core.MediaType;
  16. import javax.ws.rs.core.UriInfo;
  17. import org.hibernate.Query;
  18. import org.hibernate.Session;
  19. import util.HibernateUtil;
  21. /**
  22.  * REST Web Service
  23.  *
  24.  * @author lucas
  25.  */
  26. @Path(&quot;clientes&quot;)
  27. public class ClientController {
  28.     
  29.     @Context
  30.     private UriInfo context;
  31.     
  32.     public ClientController() {
  33.         
  34.     }
  35.     
  36.     @GET
  37.     @Produces(MediaType.APPLICATION_JSON)
  38.     public String getTeste() {
  39.         
  40.         Cliente c = new Cliente();
  41.         Session session = HibernateUtil.getSessionFactory().openSession();
  42.         session.beginTransaction();
  43.         
  44.         Query select = session.createQuery(&quot;from Cliente&quot;);
  45.         List&lt;Cliente&gt; objetos = select.list();
  46.         
  47.         objetos.forEach(item -&gt; {
  48.            System.out.println(&quot;name: &quot; + item.getNomeCliente()); 
  49.         });
  50.         
  51.         return &quot;&quot;;
  52.     }
  53. }

Maybe some missing jar on server?
Running on GlassFish 4.1.1

Server returns the message

  1. org.glassfish.jersey.server.ContainerException: java.lang.NoClassDefFoundError: Could not initialize class util.HibernateUtil

Please help me to sort out this issue thanks

答案1

得分: 0

你不应该需要导入util.HibernateUtil。你可以将HibernateUtil类声明为静态，例如public static class HibernateUtils{，然后通过HibernateUtil.doAThing();来使用，或者实例化一个HibernateUtil对象，例如HibernateUtil hibUtil = new HibernateUtil();，然后使用hibUtil.doAThing();。然而，对于后一种情况，你需要在HibernateUtil类中添加一个构造函数。

英文:

You shouldn't need to import util.HibernateUtil. You may need to either declare the HibernateUtil class as static eg public static class HibernateUtils{ and then using by writing HibernateUtil.doAThing(); or instantiate a HibernateUtil Object eg HibernateUtil hibUtil = new HibernateUtil(); and use hibUtil.doAThing(); instead.For the latter though you'll need to include a Constructor to your HibernateUtil class.

huangapple
  • 本文由 发表于 2020年7月27日 12:10:32
  • 转载请务必保留本文链接：https://java.coder-hub.com/63108591.html
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