hibernate配置出现问题，竟然连Configuration对象都生成不了。

Question

首先把控制台输出给大家看看先：
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.cen.hibernate.model.StudentTest.main(StudentTest.java:14)
Caused by: java.lang.NullPointerException
at org.slf4j.LoggerFactory.singleImplementationSanityCheck(LoggerFactory.java:192)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:113)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:269)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:242)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:255)
at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:152)

Answer 1

hibernate.cfg.xml配置文件如下：
<?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>
<!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/test1</property>
        <property name="connection.username">root</property>
        <property name="connection.password">123</property>
<!-- JDBC connection pool (use the built-in) -->
        <!--<property name="connection.pool_size">1</property>
--><!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.HSQLDialect</property>
<!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">update</property>
        <mapping resource="com/cen/hibernate/model/Student.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

Answer 2

Student.hbm.xml配置文件如下：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cem.cen.hibernate.model">
<class name="Student" table="Student">
        <id name="id" column="id">
            <generator class="native"/>
        </id>
        <property name="age" />
        <property name="name"/>
</class>
</hibernate-mapping>

Answer 3

package com.cen.hibernate.model;public class Student {
private int id;
private int age;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

Answer 4

package com.cen.hibernate.model;
import org.hibernate.cfg.Configuration;public class StudentTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
Student student = new Student();
student.setId(1);
student.setAge(23);
student.setName("test");

Configuration cfg = new Configuration().configure();
}}

Answer 5

Configuration configuration = new Configuration();
应该这样就可以了。

Answer 6

只要新建一个Configuration对象就出现空指针了。

Answer 7

<property name="dialect">org.hibernate.dialect.HSQLDialect</property> 这个不对