初学者，一直报这个错误，好久都没解决，求大神帮帮忙

[xiamocanyang]

org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.apache.ibatis.builder.BuilderException: Error evaluating expression 'user.usename'. Cause: org.apache.ibatis.ognl.NoSuchPropertyException: com.heima.po.User.usename
### Cause: org.apache.ibatis.builder.BuilderException: Error evaluating expression 'user.usename'. Cause: org.apache.ibatis.ognl.NoSuchPropertyException: com.heima.po.User.usename
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:111)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)
at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:119)
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:63)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)
at com.sun.proxy.$Proxy2.findUserList(Unknown Source)
at com.heima.test.UserMapperTest.findUserList(UserMapperTest.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:292)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: org.apache.ibatis.builder.BuilderException: Error evaluating expression 'user.usename'. Cause: org.apache.ibatis.ognl.NoSuchPropertyException: com.heima.po.User.usename
at org.apache.ibatis.scripting.xmltags.OgnlCache.getValue(OgnlCache.java:50)
at org.apache.ibatis.scripting.xmltags.TextSqlNode$BindingTokenParser.handleToken(TextSqlNode.java:64)
at org.apache.ibatis.parsing.GenericTokenParser.parse(GenericTokenParser.java:53)
at org.apache.ibatis.scripting.xmltags.TextSqlNode.apply(TextSqlNode.java:41)
at org.apache.ibatis.scripting.xmltags.MixedSqlNode.apply(MixedSqlNode.java:32)
at org.apache.ibatis.scripting.xmltags.DynamicSqlSource.getBoundSql(DynamicSqlSource.java:40)
at org.apache.ibatis.mapping.MappedStatement.getBoundSql(MappedStatement.java:278)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:75)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
... 29 more
Caused by: org.apache.ibatis.ognl.NoSuchPropertyException: com.heima.po.User.usename
at org.apache.ibatis.ognl.ObjectPropertyAccessor.getProperty(ObjectPropertyAccessor.java:122)
at org.apache.ibatis.ognl.OgnlRuntime.getProperty(OgnlRuntime.java:1657)
at org.apache.ibatis.ognl.ASTProperty.getValueBody(ASTProperty.java:92)
at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:210)
at org.apache.ibatis.ognl.ASTChain.getValueBody(ASTChain.java:109)
at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:210)
at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:333)
at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:413)
at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:395)
at org.apache.ibatis.scripting.xmltags.OgnlCache.getValue(OgnlCache.java:48)
... 37 more

[_沉浮_]

异常都提示了，追踪下

[穿条秋裤到处跑]

你看错误详情第三行：user.usename这个地方对应错了，检查一下你的配置文件，问题不大

[xiamocanyang]

<?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.heima.mapper.UserMapper">

<select id="findUserList" parameterType="com.heima.po.UserQueryVO" resultType="User">
SELECT * FROM USER WHERE username LIKE '%${user.usename}%' AND sex=#{user.sex}
</select>

<select id="findUserById" parameterType="int" resultType="User">
SELECT * FROM USER WHERE id = #{id}
</select>


<insert id="insertUser" parameterType="User">
<selectKey keyProperty="id" resultType="int" order="AFTER">
SELECT LAST_INSERT_ID()
</selectKey>
INSERT INTO USER(username,birthday,sex,address) VALUES (#{username},#{birthday},#{sex},#{address})
</insert>
</mapper>


这是配置文件还是找不到错误

[xiamocanyang]

找到了，谢谢

[迷途的码农]

Error evaluating expression 'user.usename'. Cause: org.apache.ibatis.ognl.NoSuchPropertyException: com.heima.po.User.usename 没有找到User 类的username属性