org.apache.ibatis.exceptions.PersistenceException:

### Error updating database.  Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for studentDao.insert

### Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for studentDao.insert

    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)

    at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:200)

    at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185)

    at cn.mgy.dao.impl.StudentDoImpl.insert(StudentDoImpl.java:14)

    at cn.mgy.test.StudentTest.insert(StudentTest.java:18)

    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.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:538)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

Caused by: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for studentDao.insert

    at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:860)

    at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:693)

    at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:686)

    at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:197)

    ... 26 more

 <?xml version="1.0" encoding="UTF-8"?>

 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "mybatis-3-mapper.dtd" >

 <mapper namespace="studnetDao">  <!--修改为 <mapper namespace="studentDao">-->

   <insert id="insert" useGeneratedKeys="true" keyProperty="studentId">

       INSERT INTO tb_student(STUDENT_NAME, STUDENT_PWD)

     VALUES (#{studentName}, #{studentPwd})

   </insert>

 </mapper>