java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.stud

最近使用Mybatis报了如下错误：


org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.  Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.study.mybatis.mapper.UserMapper.selectById
### Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.study.mybatis.mapper.UserMapper.selectByIdat org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)at com.study.mybatis.test.SqlSessionTest.testSqlSession(SqlSessionTest.java:21)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.study.mybatis.mapper.UserMapper.selectByIdat org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:875)at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:708)at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:701)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)... 25 more

查了资料发现可能有以下的一些原因：
1.Mybatis映射文件的命名空间与mapper接口不符
2.Mybatis映射文件的命名与mapper接口不同
3.mapper接口中的方法名对应映射文件中id属性不一致
4.Mybatis的配置文件没有添加映射文件

一通操作后发现以上都没有问题，最后查看target目录发现UserMapper.xml没有编译（映射文件和mapper接口放在了一个包下），查阅资料，发现在编译阶段src/main/java和src/test/java目录下的 *.java的编译结果会放到target/classes和targe/test-classes下，而其他文件会被忽略。
解决方法，在pom.xml中配置build的resources

<build><!-- 资源目录 --><resources><resource><!-- 设定主资源目录  --><directory>src/main/java</directory><includes><include>**/*.xml</include></includes><filtering>true</filtering></resource></resources></build>

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