Hibernate 异常 集锦

异常1.Error parsing JNDI name [foo]

异常信息摘要：

org.hibernate.engine.jndi.JndiException: Error parsing JNDI name [foo]
    at org.hibernate.engine.jndi.internal.JndiServiceImpl.parseName(JndiServiceImpl.java:141)

异常信息说明：不能解析连接池foo

拷贝官方配置文件hibernate.cfg.xml的里面<session-factory name=”foo”>默认包含此foo属性配置，此异常不过是不影响运行的结果

解决思路：删除name=”foot”即可

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异常2.org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [com.mysql.jdbc.Driver]

异常信息摘要：

org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [com.mysql.jdbc.Driver]
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:243)
    at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.loadDriverIfPossible(DriverManagerConnectionProviderImpl.java:200)

异常信息说明：不能加载mysql驱动

解决思路：拷贝mysql驱动至classpath或者修改maven的pom.xml

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.40</version>
</dependency>

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异常3.密码错误

异常信息摘要：

org.hibernate.exception.JDBCConnectionException: Error calling Driver#connect
Caused by: java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)

异常信息说明：不能获取连接

解决思路：修改mysql的密码至正确

密码写错或者connection.pasword少写一个s字母
<property name="connection.pasword">12345</property>

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异常4.连接数据库url错误

异常信息摘要：

java.lang.UnsupportedOperationException: The application must supply JDBC connections
<property name="connection.urls">jdbc:mysql:///hibernate</property>
org.hibernate.HibernateException: Unable to make JDBC Connection [jdbc:mysql6:///hibernate]
<property name="connection.url">jdbc:mysql:///hibernate</property>

异常信息说明：url地址或者key写错

解决思路：修改url地址或者key

<property name="connection.url">jdbc:mysql:///hibernate</property>

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异常5.未知实体类

异常信息摘要：

org.hibernate.MappingException: Unknown entity: com.jege.hibernate.single.table.User
    at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1096)
    at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1443)

异常信息说明：映射异常，hibernate配置文件没有加载映射文件

解决思路：在配置文件中通过mapping元素将映射文件加载进来

<mapping resource="com/jege/hibernate/single/table/User.hbm.xml" />

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异常6.全类名写错

异常信息摘要：

org.hibernate.InvalidMappingException: Could not parse mapping document from resource com/jege/hibernate/single/table/User.hbm.xml
Caused by: org.hibernate.MappingException: class com.jege.hibernate.single.table.User.User not found while looking for property: id
Caused by: java.lang.ClassNotFoundException: com.jege.hibernate.single.table.User.User
<hibernate-mapping package="com.jege.hibernate.single.table.User">
    <class name="User" table="t_user">

异常信息说明：映射文件全类名不正确

解决思路：修改全类名

属性package只写包路径，不要将类名也写进去
<hibernate-mapping package="com.jege.hibernate.single.table">
    <class name="User" table="t_user">

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异常7.属性名写错

异常信息摘要：

org.hibernate.InvalidMappingException: Could not parse mapping document from resource com/jege/hibernate/single/table/User.hbm.xml
Caused by: org.hibernate.PropertyNotFoundException: field [userUame] not found on com.jege.hibernate.single.table.User

<property name="userUame" column="name" />

异常信息说明：映射文件属性名不正确

解决思路：修改属性名

<property name="username" column="name" />

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异常8.对象不存在

异常信息摘要：

org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.jege.hibernate.single.table.User#5]

User user = (User)session.load(User.class, 5L);
System.out.println(user.getPassword());

异常信息说明：load方法没有找到对应的主键的实体

解决思路：使用get方法替换load，判断返回值是否null

User user = (User) session.get(User.class, 5L);
if (user != null) {
  System.out.println(user.getPassword());
}

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