MyBtis注解方式注册异常

MyBtis注解方式注册异常

最近学习MyBatis，学习到注解方式实现增删改查使遇到异常，困惑的很长时间，最终找到解决问题的方法，共勉！

写好注解的接口后注册到配置文件时使用

方式一
 

<mapper class="com.liuyunlong.mybatis.annotation.UserMapper" />   

问题来了，抛出异常如下：

org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 26; columnNumber: 66; 必须为元素类型 "mapper" 声明属性 "class"。
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:60)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:44)
	at com.liuyunlong.mybatis.utils.MyBatisUtil.getSession(MyBatisUtil.java:22)
	at com.liuyunlong.mybatis.test.Lesson3.add(Lesson3.java:20)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 26; columnNumber: 66; 必须为元素类型 "mapper" 声明属性 "class"。
	at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:238)
	at org.apache.ibatis.parsing.XPathParser.(XPathParser.java:107)
	at org.apache.ibatis.builder.xml.XMLConfigBuilder.(XMLConfigBuilder.java:52)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:57)
	... 26 more

我使用另外一种注册方式，通过包名注解，该包下面的所有mapper文件都能自动的注册到配置文件。

 

<package name="com.liuyunlong.mybatis.annotation"/>  

问题又来了，抛出异常如下

 

 

org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 26; columnNumber: 54; 必须声明元素类型 "package"。
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:60)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:44)
	at com.liuyunlong.mybatis.utils.MyBatisUtil.getSession(MyBatisUtil.java:22)
	at com.liuyunlong.mybatis.test.Lesson3.add(Lesson3.java:20)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 26; columnNumber: 54; 必须声明元素类型 "package"。
	at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:238)
	at org.apache.ibatis.parsing.XPathParser.(XPathParser.java:107)
	at org.apache.ibatis.builder.xml.XMLConfigBuilder.(XMLConfigBuilder.java:52)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:57)
	... 26 more

网上苦苦查找原因，有位网友指出，MyBtis在3.2以后才支持，之前的版本可通过新建一个mapper.xml文件，指定namespace为该接口文件，如下：

 

<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">  
  
<mapper namespace="com.liuyunlong.mybatis.annotation.UserMapper">  
  
  
</mapper>  

然后再在配置文件中注册这个mapper.xml文件就ok了

 

<mappers>  
    <mapper resource="com/liuyunlong/mybatis/map/mapper.xml" />  
</mappers>  

问题搞定！

那么是不是真的3.2以后的版本就支持了以上两种方式，更新MyBatis的jar文件验证，我验证了3.2.4版本，以上两种方式可以。