在Maven中找不到要去的声明？

Question

When I ran the Test Class(CountryMapperTest.java), the error has been occurred. The following is error information.

org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### The error may exist in tk.mybatis.simple.mapper.CountryMapper.xml
### Cause: org.apache.ibatis.builder.BuilderException:
    Error parsing SQL Mapper Configuration. 
    Cause: java.io.IOException: 
    Could not find resource tk.mybatis.simple.mapper.CountryMapper.xml

Project Directory

By analysing the error messages, I think that the bug comes from the following statement in the mybatis-config.xml file.

<mappers>
    <mapper resource="tk.mybatis.simple.mapper.CountryMapper.xml"/>
</mappers>

I have tried some solutions that work for others:

1. File | Invalidate Caches / Restart
2. Select the Directory | Make Directory as Resources Root, etc..
3. Add the relative code snippet in the pom.xml:

<resource>
  <directory>src/main/java</directory>
    <includes>
      <include>**/*.xml</include>
    </includes>
  </resource>
</resources>

Relative code

CountryMapperTest.java

<?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="tk.mybatis.simple.mapper.CountryMapper">
  <select id="selectAll" resultType="Country">
    select id,countryname,countrycode from country
  </select>
</mapper>

mybatis-config.xml

 <?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> <settings> <setting name="logImpl" value="LOG4J"/> </settings> <typeAliases> <package name="tk.mybatis.simple.model"/> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"> <property name="" value=""/> </transactionManager> <dataSource type="UNPOOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mybatis"/> <property name="username" value="root"/> <property name="password" value="12345"/> </dataSource> </environment> </environments> <mappers> <mapper resource="tk.mybatis.simple.mapper.CountryMapper.xml"/> </mappers> </configuration> 

CountryMapper.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="tk.mybatis.simple.mapper.CountryMapper"> <select id="selectAll" resultType="Country"> select id,countryname,countrycode from country </select> </mapper> 

I expect to query the database and show data in console.

More Details

• IDE: IntelliJ IDEA, 2019.1
• OS: macOS Mojave, 10.14.3

Answer 1

The mapper resource path should be separated by slash.

<mapper resource="tk/mybatis/simple/mapper/CountryMapper.xml"/>

http://www.mybatis.org/mybatis-3/configuration.html#mappers

Answer 2

In addition to the ave's solution, we also need to check the package naming and path.

Because the optical package naming is the same in IntelliJ IDEA, the both are the tk.mybatis.simple.mapper .

Actually, correct path is tk/mybatis/simple/mapper , error path is tk.mybatis.simple.mapper .

Please follow the below method to check it:

1. File | Project Structure...
2. click Modules | Your Project Name | Sources