我哪里错了？我正在使用 Maven ProJect 使用 hibernate、JSP、SERVLET 制作 TODO 应用程序

Posted 2023-02-16

【中文标题】我哪里错了？我正在使用 Maven ProJect 使用 hibernate、JSP、SERVLET 制作 TODO 应用程序

【英文标题】：Where I am wrong? I am using Maven ProJect to make TODO application with hibernate ,JSP, SERVLET

【发布时间】：2021-08-08 07:08:22

【问题描述】：

我的问题数据库连接 警告：SQL 错误：0，SQLState：08001 2021 年 5 月 18 日 8:08:09 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions 错误：找不到合适的驱动程序 我遇到了数据库连接问题。我正在使用 Eclispse 数据库 10g 雄猫 8.5 Ojdbc 14

我的代码是 hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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/XE</property>
        <property name="connection.username">system</property>
        <property name="connection.password">system</property>
        <property name="hibernate.default_schema">system</property>
        <property name="dialect">org.hibernate.dialect.Oracle8iDialect</property>
        <property name="hdm2ddl.auto">update</property>
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>
        <mapping class="com.entities.Note"/>
       
    </session-factory>
    </hibernate-configuration>

**SaveNoteServlet.java**




public class SaveNoteServlet extends HttpServlet 
    private static final long serialVersionUID = 1L;
       
    
    public SaveNoteServlet() 
        super();
      
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
        try 
            //title ,content fetch
            String title=request.getParameter("title");
            String content=request.getParameter("content");
            Note note=new Note(title,content,new Date());
            System.out.println(note);
            //hibernate :save
            Session ses=HibernateUtil.getSessionFactory().openSession();
            System.out.println(ses);
            Transaction t=ses.beginTransaction();
            ses.save(note);
            t.commit();
            ses.close();
            System.out.println("Tble created");
        catch(Exception e) 
            
        
    



**HIbernateUtil.java**
public class HibernateUtil 
    private static SessionFactory sessionFactory;

    private static SessionFactory buildSessionFactory() 
        StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder().
                configure("hibernate.cfg.xml").build();

        Metadata metadata = new MetadataSources(standardRegistry).getMetadataBuilder().
                build();

        SessionFactoryBuilder sessionFactoryBuilder = metadata.getSessionFactoryBuilder();

        SessionFactory sessionFactory = sessionFactoryBuilder.build();

        return sessionFactory;
    
    public static SessionFactory getSessionFactory() 
        if (sessionFactory == null) 
            sessionFactory = buildSessionFactory();
        
        return sessionFactory;
    
    public static void close() 
        if(sessionFactory.isOpen()) 
            sessionFactory.close();
        
    

 
Error code-

May 18, 2021 8:08:04 PM org.hibernate.Version logVersion

INFO: HHH000412: Hibernate Core 5.4.5.Final

May 18, 2021 8:08:08 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>

INFO: HCANN000001: Hibernate Commons Annotations 5.1.0.Final

May 18, 2021 8:08:08 PM
org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
May 18, 2021 8:08:09 PM 
org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [null] at URL []
May 18, 2021 8:08:09 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator

INFO: HHH10001001: Connection properties: password=****, driver_Class=oracle.jdbc.driver.OracleDriver, user=system

    May 18, 2021 8:08:09 PM 
    org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH10001003: Autocommit mode: false
    May 18, 2021 8:08:09 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl$PooledConnections <init>
    INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
    
    May 18, 2021 8:08:09 PM org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator initiateService
    WARN: HHH000342: Could not obtain connection to query metadata : Cannot invoke "org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl$PoolState.getConnection()" because "this.state" is null
    
    May 18, 2021 8:08:09 PM org.hibernate.dialect.Dialect <init>
    
    INFO: HHH000400: Using dialect: org.hibernate.dialect.Oracle8iDialect
    
    May 18, 2021 8:08:09 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
    WARN: SQL Error: 0, SQLState: 08001
    
    May 18, 2021 8:08:09 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
    ERROR: No suitable driver found for 

【参考方案1】：

我也遇到了同样的错误，但是在搜索了各种网站并尝试了他们的解决方案后，我知道您为 mysql 包含的依赖项应该在您的系统中安装了相同的版本。

在我的例子中，这种依赖可以正常工作-

     <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.6</version>
    </dependency>

您也可以尝试不同的版本。

【参考方案2】：

为什么连接 url 属性值留空？

以下是工作属性，试一试，如果有任何问题，请告诉我。

<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property> 
<property name="hibernate.connection.username">scott</property>
<property name="hibernate.connection.password">tiger</property>

【讨论】：

在添加 url "jdbc:oracle:thin:@//localhost:1521/XE"后我也遇到了问题