Error querying database. Cause: org.apache.ibatis.reflection.ReflectionException: There is no gette

Posted 2022-05-01 xinshengdaicainiao

　　再用 junit 测试MyBatis时发现的错误：

org.apache.ibatis.exceptions.PersistenceException: ### Error querying database.  Cause: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named ‘ItemsCustom‘ in ‘class com.pojo.OrderDetailCustom‘ ### The error may exist in com/dao/OrderDetailMapper.xml ### The error may involve com.dao.OrderDetailMapper.searchOrderDetailByIdForResultMap ### The error occurred while handling results ### SQL: select o.id , o.items_num , o.orders_id , o.items_id , i.name , i.createtime   from orderDetail o left join items i on o.items_id = i.id   where o.id = ? ### Cause: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named ‘ItemsCustom‘ in ‘class com.pojo.OrderDetailCustom‘     at 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 org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:83)     at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)     at com.sun.proxy.$Proxy6.searchOrderDetailByIdForResultMap(Unknown Source)     at com.test.TestUser.testSearchOrderDetailByIdForResultMap(TestUser.java:251)     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.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)     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: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.reflection.ReflectionException: There is no getter for property named ‘ItemsCustom‘ in ‘class com.pojo.OrderDetailCustom‘     at org.apache.ibatis.reflection.Reflector.getGetInvoker(Reflector.java:419)     at org.apache.ibatis.reflection.MetaClass.getGetInvoker(MetaClass.java:164)     at org.apache.ibatis.reflection.wrapper.BeanWrapper.getBeanProperty(BeanWrapper.java:162)     at org.apache.ibatis.reflection.wrapper.BeanWrapper.get(BeanWrapper.java:49)     at org.apache.ibatis.reflection.MetaObject.getValue(MetaObject.java:122)     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.instantiateCollectionPropertyIfAppropriate(DefaultResultSetHandler.java:1129)     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyNestedResultMappings(DefaultResultSetHandler.java:961)     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:918)     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForNestedResultMap(DefaultResultSetHandler.java:881)     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:328)     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:303)     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:196)     at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)     at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)     at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)     at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)     at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)     at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)     at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)     at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)     ... 30 more

　　从上面看错误是我们在pojo的类里面提供ItemsCustom的getter方法，但是在检查该类是，确实已经提供了getter/setter方法，而且是ide生成的，那么问题出在哪呢，是junit报错有偏差吗？明显不是的，我们有一个习惯在xml文件中使用类是都是类名，却会疏忽在ItemsCustom这是一个引用类型，是当前类的一个自定义属性，几位就是说他是一个类型名，而我们在xml文件中也先入为主的写了类名，代码如下：

<resultMap type="OrderDetailCustom" id="OTM">         <id column="id" property="id"/>         <result column="items_num" property="items_num"/>         <result column="orders_id" property="orders_id"/>         <result column="items_id" property="items_id"/>                  <association property="ItemsCustom" javaType="ItemsCustom">             <result column="name" property="name"/>             <result column="createtime" property="createtime"/>         </association>     </resultMap>

而在property标签中，我们要写的是属性，而这个属性并不是这个类型，二十这个属性名，我的是itemsCustom,将property标签中的属性名修改正确后即解决问题，代码如下：

<resultMap type="OrderDetailCustom" id="OTM">         <id column="id" property="id"/>         <result column="items_num" property="items_num"/>         <result column="orders_id" property="orders_id"/>         <result column="items_id" property="items_id"/>                  <association property="itemsCustom" javaType="ItemsCustom">             <result column="name" property="name"/>             <result column="createtime" property="createtime"/>         </association>     </resultMap>

菜鸟在努力，希望我踩过的坑，能成为诸位bug兄的垫脚石！