Mybatis中的java.io.NotSerializableException

在学习Mybatis中，用JUnit运行了一个测试方法，出现了如下错误：

org.apache.ibatis.cache.CacheException: Error serializing object. Cause: java.io.NotSerializableException: com.lilu.mybatis.po.User
运行的测试方法如下：

@Testpublic void testFindUserByHashmap() {//获取sessionSqlSession session = sqlSessionFactory.openSession();//获限mapper接口实例UserMapper userMapper = session.getMapper(UserMapper.class);//构造查询条件Hashmap对象HashMap<String, Object> map = new HashMap<String, Object>();map.put("id", 4);map.put("username", "xiao");//传递Hashmap对象查询用户列表List<User> list;try {list = userMapper.findUserByHashmap(map);for (User user : list) {System.out.println(user);}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{//关闭sessionsession.close();}}

usermapper.xml中的sql语句：

<select id="findUserByHashmap" parameterType="Hashmap" resultType="com.lilu.mybatis.po.User">select * from user where id=#{id} and username like '%${username}%'</select>

看异常发现说com.lilu.mybatis.po.User这个实体类没有序列化，然后我在User类中加上implements Serializable再运行一次就不报错了。

public class User implements Serializable{public User() {// TODO Auto-generated constructor stub}....}

14:47:33,232 DEBUG org.apache.ibatis.logging.LogFactory:135 - Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter.
14:47:33,385 DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource:316 - PooledDataSource forcefully closed/removed all connections.
14:47:33,385 DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource:316 - PooledDataSource forcefully closed/removed all connections.
14:47:33,386 DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource:316 - PooledDataSource forcefully closed/removed all connections.
14:47:33,386 DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource:316 - PooledDataSource forcefully closed/removed all connections.
14:47:33,577 DEBUG com.lilu.mybatis.mapper.UserMapper:62 - Cache Hit Ratio [com.lilu.mybatis.mapper.UserMapper]: 0.0
14:47:33,586 DEBUG org.apache.ibatis.transaction.jdbc.JdbcTransaction:136 - Opening JDBC Connection
14:47:33,938 DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource:387 - Created connection 22756955.
14:47:33,939 DEBUG org.apache.ibatis.transaction.jdbc.JdbcTransaction:100 - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@15b3e5b]
14:47:33,942 DEBUG com.lilu.mybatis.mapper.UserMapper.findUserByHashmap:159 - ==>  Preparing: select * from user where id=? and username like '%xiao%'
14:47:33,992 DEBUG com.lilu.mybatis.mapper.UserMapper.findUserByHashmap:159 - ==> Parameters: 4(Integer)
14:47:34,024 DEBUG com.lilu.mybatis.mapper.UserMapper.findUserByHashmap:159 - <==      Total: 1
User [id=4,username=xiaojun,sex=1,birthday=Tue Sep 26 00:00:00 CST 2017,address=天津市,toString=com.lilu.mybatis.po.User@dbd940d]
14:47:34,059 DEBUG org.apache.ibatis.transaction.jdbc.JdbcTransaction:122 - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@15b3e5b]
14:47:34,060 DEBUG org.apache.ibatis.transaction.jdbc.JdbcTransaction:90 - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@15b3e5b]
14:47:34,061 DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource:344 - Returned connection 22756955 to pool.

上面是正常运行的结果，运行后还有数据库连接的释放资源，运行其他测试方法的时候都没有。

如果报序列化的错误就去找报错的类是否序列化，这个类引用的类是否序列化，如果一个父类序列化了，那么它的子类不需要implements Serializable也序列化了。

然后什么是序列化，为什么要序列化呢？

这个大大写的很详细：点击打开链接

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