MyBatis 3.0.5和映射器加载问题 [英] MyBatis 3.0.5 and mappers loading problem

问题描述

我正在使用MyBatis 3.0.5，我遇到了将映射器加载为资源的问题。我使用的是Windows 7 64，我使用Eclipse Indigo 64bit和jdk7 64. MyBatis在Grizzly Web容器中实现（在其中实现了使用jersey框架的休息服务）独立实例。

I'm using MyBatis 3.0.5 and I have problems about the loading of mappers as resources. I'm on Windows 7 64, I use Eclipse Indigo 64bit and jdk7 64. MyBatis is initialized in a Grizzly Web Container (where are implemented rest services with jersey framework) standalone instance.

<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，第一个加载，第二个不起作用。错误：

I have the same mappers only for testing, the first is loaded, the second doesn't work. Errors:

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)

对不起我的英语。

解决方案：
Maven项目需要资源到src / main / resources和src / test /资源用于测试。因此解决方案是将xml映射器放入这些文件夹中。

SOLUTION: Maven projects want resources into src/main/resources and src/test/resources for tests. So the solution is to put the xml mappers into these folders.

推荐答案

不要使用绝对路径。它使您的代码在其他环境中不可移植和未使用。只是相对可接受。对于您的示例，我猜您可以使用以下相对路径：

Do not use absolute paths. It makes your code unportable and unused on another environment. Just relative acceptable. For your example, I guess you can use the following relative path:

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

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