異常線程「main」 java.lang.ExceptionInInitializerError改變搖籃項目的文件夾結構

Question

Exception in thread "main" java.lang.ExceptionInInitializerError 
    at com.myBatis.Dao.VillageDAO.save(VillageDAO.java:14) 
    at com.myBatis.service.RunMybatis.main(RunMybatis.java:17) 
Caused by: org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession. 
### The error may exist in SQL Mapper Configuration 
### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error registering typeAlias for 'village'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.myBatis.mapper.Village 
    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26) 
    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:82) 
    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:66) 
    at com.myBatis.service.MyBatisUtil.<clinit>(MyBatisUtil.java:23) 
    ... 2 more 
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error registering typeAlias for 'village'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.myBatis.mapper.Village 
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:109) 
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:92) 
    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:80) 
    ... 4 more 
Caused by: org.apache.ibatis.builder.BuilderException: Error registering typeAlias for 'village'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.myBatis.mapper.Village 
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.typeAliasesElement(XMLConfigBuilder.java:130) 
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:99) 
    ... 6 more 
Caused by: java.lang.ClassNotFoundException: Cannot find class: com.myBatis.mapper.Village 
    at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:190) 
    at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89) 
    at org.apache.ibatis.io.Resources.classForName(Resources.java:256) 
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.typeAliasesElement(XMLConfigBuilder.java:123) 
    ... 7 more 

，當我試圖使用MyBatis的configuration.When執行在搖籃項目一個簡單的CRUD操作，我用我所有的java文件在SRC/java/main與單個包它都很好。但是當我試圖在同一個src/main/java目錄下分割多個包的文件時，它會拋出java.lang.ClassNotFoundException異常。幫我出去。

VillageMapper.xml

<?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.myBatis.mapper.VillageMapper" > 
    <resultMap id="villageResult" type="village"> 
     <id property="id" column="id" /> 
     <result property="name" column="name"/> 
     <result property="district" column="district"/> 
    </resultMap> 
    <select id="selectVillage" resultType="village" parameterType="int" resultMap="villageResult"> 
     SELECT id, name, district from village WHERE id = #{id} 
    </select> 
    <insert id="insertVillage" parameterType="village" keyProperty="id" useGeneratedKeys="true"> 
     INSERT into village(name,district) VALUES(#{name}, #{district})   
    </insert> 
    <update id="updateVillage" parameterType="village"> 
     UPDATE village SET name=#{name}, district =#{district} WHERE id =#{id}   
    </update> 
    <delete id="deleteVillage" parameterType="int"> 
     DELETE FROM village WHERE id =#{id}   
    </delete> 
</mapper> 

的MyBatis-config.xml中

<?xml version="1.0" encoding="UTF-8"?> 

<!DOCTYPE configuration 
    PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 
    "http://mybatis.org/dtd/mybatis-3-config.dtd"> 
<configuration> 
    <typeAliases> 
    <typeAlias type="com.myBatis.mapper.Village" alias="village"/> 
    </typeAliases> 
    <environments default="development"> 
    <environment id="development"> 
     <transactionManager type="JDBC"/> 
     <dataSource type="POOLED"> 
     <property name="driver" value="com.mysql.jdbc.Driver"/> 
     <property name="url" value="jdbc:mysql://192.168.11.122:3306/srikanth_k"/> 
     <property name="username" value="srikanth_k"/> 
     <property name="password" value="demo"/> 
     </dataSource> 
    </environment> 
    </environments> 
    <mappers> 
    <mapper resource="com/myBatis/mapper/VillageMapper.xml" /> 
    </mappers> 
</configuration> 

MyBatisUtil.java

package com.myBatis.service; 

import java.io.IOException; 
import java.io.InputStream; 

import org.apache.ibatis.io.Resources; 
import org.apache.ibatis.session.SqlSessionFactory; 
import org.apache.ibatis.session.SqlSessionFactoryBuilder; 

public class MyBatisUtil { 

    private static SqlSessionFactory sqlSessionFactory; 

    static { 

     String resource = "mybatis-config.xml"; 

     InputStream inputStream; 

     try { 

      inputStream = Resources.getResourceAsStream(resource); 
      sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); 

     } catch (IOException e) { 

      e.printStackTrace(); 
     } 
    } 

    public static SqlSessionFactory getSqlSessionFactory() { 

     return sqlSessionFactory; 
    } 
} 

的build.gradle

apply plugin: 'java' 
apply plugin: 'eclipse' 
apply plugin: 'war' 
archivesBaseName = 'myBatis' 
version = '1' 
repositories { 
    mavenCentral() 
} 
dependencies { 
    compile 'org.mybatis:mybatis:3.2.8' 
    compile 'mysql:mysql-connector-java:5.1.34' 
} 

我的項目目錄多個包版本

myBatis 
    -src/main/java 
     -com.myBatis.api 
      -Village.java 
     -com.myBatis.Dao 
      -VillageDao.java 
     -com.myBatis.service 
      -MyBatisUtil.java 
      -RunMyBatis.java 
    -src/main/resources 
     -com.myBatis.mapper 
      -VillageMapper.xml 
     -mybatis-config.xml 

我的項目目錄單封裝版本

myBatis 
     -src/main/java 
      -com.myBatis.api 
       -Village.java 
       -VillageDao.java 
       -MyBatisUtil.java 
       -RunMyBatis.java 
     -src/main/resources 
       -com.myBatis.mapper 
        -VillageMapper.xml 
       -mybatis-config.xml 

Answer 1

的問題是在的MyBatis-config.xml中

<typeAlias type="com.myBatis.mapper.Village" alias="village"/> 

代替

<typeAlias type="com.myBatis.api.Village" alias="village"/> 

，我指的是Village.java在所有CRUD方法VillageDAO.java相反，我應該有它映射到VillageMapper.xml。

VillageDAO.java

package com.myBatis.Dao; 


import org.apache.ibatis.session.SqlSession; 

import com.myBatis.api.Village; 
import com.myBatis.service.MyBatisUtil; 


public class VillageDAO { 

    public void save(Village village) { 

     SqlSession session = MyBatisUtil.getSqlSessionFactory().openSession(); 
     session.insert("com.myBatis.mapper.VillageMapper.insertVillage", village); 
     session.commit(); 
     session.close(); 
    } 

    public void update(Village village) { 

     SqlSession session = MyBatisUtil.getSqlSessionFactory().openSession(); 
     session.update("com.myBatis.mapper.VillageMapper.updateVillage", village); 
     session.commit(); 
     session.close(); 
    } 

    public void delete(Integer id) { 

     SqlSession session = MyBatisUtil.getSqlSessionFactory().openSession(); 
     session.delete("com.myBatis.mapper.VillageMapper.deleteVillage", id); 
     session.commit(); 
     session.close(); 
    } 

    public Village getData(Integer id) { 

     SqlSession session = MyBatisUtil.getSqlSessionFactory().openSession(); 
     Village village  = session.selectOne("com.myBatis.mapper.VillageMapper.selectVillage", id); 
     session.close(); 
     return village; 
    } 
}