Question

这是我的第一个hibernate项目：

enter image description here

hibernate.cfg：

<?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>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.url">jdbc:mysql://localhost:33606/myHibernateDatabase</property>
    <property name="connection.username">root</property>
    <property name="connection.password">2323</property>
    <property name="connection.pool_size">1</property>
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
    <property name="show_sql">true</property>
    <property name="hbm2ddl.auto">create</property>
    <mapping class="sajjad.htlo.Student_Info"/>
</session-factory>
</hibernate-configuration>

这是我的模特课：

@Entity
@Table(name="Student_Information")
public class Student_Info {

private String name;
@Id
private int id;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}
}

这是MainApp类来运行：

public class MainApp {
public static void main(String[] args) {
    Student_Info student = new Student_Info();
    student.setId(10);
    student.setName("sajjad");

    SessionFactory sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
    Session session = sessionFactory.openSession();
    session.beginTransaction();
    session.save(student);
    session.getTransaction().commit();

    session.close();
    sessionFactory.close();
    }
 }

但是我在运行时遇到了这个异常：

org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
    INFO: HCANN000001: Hibernate Commons Annotations {4.0.4.Final}
    Feb 06, 2015 9:43:58 PM org.hibernate.Version logVersion
    INFO: HHH000412: Hibernate Core {4.3.1.Final}
    Feb 06, 2015 9:43:58 PM org.hibernate.cfg.Environment <clinit>
    INFO: HHH000206: hibernate.properties not found
    Feb 06, 2015 9:43:58 PM org.hibernate.cfg.Environment buildBytecodeProvider
    INFO: HHH000021: Bytecode provider name : javassist
    Feb 06, 2015 9:43:58 PM org.hibernate.cfg.Configuration configure
    INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
    Feb 06, 2015 9:43:58 PM org.hibernate.cfg.Configuration getConfigurationInputStream
    INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
    Feb 06, 2015 9:43:58 PM org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity
    WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
    Feb 06, 2015 9:43:58 PM org.hibernate.cfg.Configuration doConfigure
    INFO: HHH000041: Configured SessionFactory: null
    Feb 06, 2015 9:43:58 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
    WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
    Feb 06, 2015 9:43:58 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:33606/myHibernateDatabase]
    Feb 06, 2015 9:43:58 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH000046: Connection properties: {user=root, password=****}
    Feb 06, 2015 9:43:58 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH000006: Autocommit mode: false
    Feb 06, 2015 9:43:58 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
    INFO: HHH000115: Hibernate connection pool size: 1 (min=1)
    Exception in thread "main" org.hibernate.exception.JDBCConnectionException: Error calling Driver#connect
        at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:132)
        at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator$1$1.convert(BasicConnectionCreator.java:118)
        at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator.convertSqlException(BasicConnectionCreator.java:140)
        at org.hibernate.engine.jdbc.connections.internal.DriverConnectionCreator.makeConnection(DriverConnectionCreator.java:58)
        at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator.createConnection(BasicConnectionCreator.java:75)
        at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:106)
        at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:89)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:206)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:178)
        at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:260)
        at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:94)
        at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:89)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:206)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:178)
        at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1885)
        at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1843)
        at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1928)
        at sajjad.htlo.MainApp.main(MainApp.java:15)
    Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

    The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2461)
        at 

com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2498)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
    at org.hibernate.engine.jdbc.connections.internal.DriverConnectionCreator.makeConnection(DriverConnectionCreator.java:55)
    ... 14 more
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at java.net.Socket.<init>(Socket.java:434)
    at java.net.Socket.<init>(Socket.java:244)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
    ... 27 more

我已安装MySQL，其用户名为root，密码为2323

有什么问题？

Answer 1

你的实际错误是 通信链路故障：成功发送到服务器的最后一个数据包是0毫秒前。驱动程序尚未收到来自服务器的任何数据包。 请查看以下链接，可以帮助您。

Solving a "communications link failure" with JDBC and MySQL

Answer 2

对我来说似乎是一个错字，是你的Mysql正在侦听端口33606

"jdbc:mysql://localhost:33606"

应该是（默认情况下，如果您没有更改）3306，请验证。

这可能是你获得

的原因

Exception in thread "main" org.hibernate.exception.JDBCConnectionException: Error calling Driver#connect

Answer 3

如果您获得org.hibernate.exception.JDBCConnectionException: Error calling Driver#connect或Communications link failure，则表示您无法连接到数据库。可能是因为您可能没有使用正确的驱动程序，或者您的数据库无法访问。以下是可用于识别问题的几个步骤。您可以参考this post了解详细说明。

JDBC URL中的IP地址或主机名错误。

本地DNS服务器无法识别JDBC URL中的主机名。

JDBC URL中缺少或错误端口号。

数据库服务器已关闭。

数据库服务器不接受TCP / IP连接。

数据库服务器已用完连接。

Java和DB之间的某些东西阻止了连接，例如防火墙或代理。


要解决其中一个问题，请遵循以下建议：


使用ping验证并测试它们。

刷新DNS或在JDBC URL中使用IP地址。

根据MySQL DB的my.cnf进行验证。

启动数据库。

验证mysqld是否在没有--skip-networking option的情况下启动。

重新启动数据库并相应地修改代码，以关闭finally。
中的连接
禁用防火墙和/或配置防火墙/代理以允许/转发端口。

第一个带注释的Hibernate项目

3 个答案: