MyBatis 3.0.5 和映射器加载问题

Question

我正在使用 MyBatis 3.0.5，并且在加载映射器作为资源时遇到问题。我使用的是 Windows 7 64，我使用 Eclipse Indigo 64 位和 jdk7 64。MyBatis 在 Grizzly Web 容器（其中使用 jersey 框架实现休息服务）独立实例中初始化。

<mappers>
        <mapper
            url="file:///C:/Users/andrea/workspace/soap2rest/src/main/java/com/izs/mybatis/FormMapper.xml" />
        <mapper resource="src/main/java/com/izs/mybatis/FormMapper.xml" />
    </mappers>

我有相同的映射器仅用于测试，第一个已加载，第二个不起作用。错误：

org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### The error may exist in src/main/java/com/izs/mybatis/FormMapper.xml
### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource src/main/java/com/izs/mybatis/FormMapper.xml
    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8)
    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:32)
    at com.izs.Main.initMyBatis(Main.java:114)
    at com.izs.Main.main(Main.java:80)
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource src/main/java/com/izs/mybatis/FormMapper.xml
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:85)
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:69)
    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:30)
    ... 2 more
Caused by: java.io.IOException: Could not find resource src/main/java/com/izs/mybatis/FormMapper.xml
    at org.apache.ibatis.io.Resources.getResourceAsStream(Resources.java:89)
    at org.apache.ibatis.io.Resources.getResourceAsStream(Resources.java:76)
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.mapperElement(XMLConfigBuilder.java:253)
    at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:83)
    ... 4 more
Exception in thread "main" java.lang.NullPointerException
    at com.izs.Main.initMyBatis(Main.java:122)
    at com.izs.Main.main(Main.java:80)

抱歉我的英语。

解决方案： Maven 项目希望将资源放入 src/main/resources 和 src/test/resources 中进行测试。所以解决方案是将 xml 映射器放入这些文件夹中。

Answer 1

不要使用绝对路径。它使您的代码无法在其他环境中移植和使用。只是相对可以接受。对于您的示例，我想您可以使用以下相对路径：

<mapper resource="com/izs/mybatis/FormMapper.xml" />