mybatis多对一测试时报错argument type mismatch

测试环境：

　　mybatis+lombok

　　Teacher和Student使用lombok的@AllArgsConstructor

报错信息：

 1 org.apache.ibatis.exceptions.PersistenceException: 
 2 ### Error querying database.  Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.szgl.pojo.StudentPojo with invalid types (Integer,String,TeacherPojo) or values (2,小红,1). Cause: java.lang.IllegalArgumentException: argument type mismatch
 3 ### The error may exist in com/szgl/dao/StudentMapper.xml
 4 ### The error may involve com.szgl.dao.StudentMapper.getAllStudent
 5 ### The error occurred while handling results
 6 ### SQL: select * from tbl_student
 7 ### Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.szgl.pojo.StudentPojo with invalid types (Integer,String,TeacherPojo) or values (2,小红,1). Cause: java.lang.IllegalArgumentException: argument type mismatch
 8 
 9     at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
10     at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)
11     at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
12     at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:147)
13     at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:80)
14     at org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:144)
15     at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:85)
16     at com.sun.proxy.$Proxy7.getAllStudent(Unknown Source)
17     at TestDemo.testFunc04(TestDemo.java:60)
18     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
19     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
20     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
21     at java.lang.reflect.Method.invoke(Method.java:498)
22     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
23     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
24     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
25     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
26     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
27     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
28     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
29     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
30     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
31     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
32     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
33     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
34     at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
35     at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
36     at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
37     at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
38     at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
39     at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
40 Caused by: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.szgl.pojo.StudentPojo with invalid types (Integer,String,TeacherPojo) or values (2,小红,1). Cause: java.lang.IllegalArgumentException: argument type mismatch
41     at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:88)
42     at org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:53)
43     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createUsingConstructor(DefaultResultSetHandler.java:676)
44     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createByConstructorSignature(DefaultResultSetHandler.java:654)
45     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:618)
46     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:591)
47     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:397)
48     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:354)
49     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:328)
50     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:301)
51     at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:194)
52     at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:65)
53     at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
54     at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
55     at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
56     at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
57     at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
58     at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
59     at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
60     ... 29 more
61 Caused by: java.lang.IllegalArgumentException: argument type mismatch
62     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
63     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
64     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
65     at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
66     at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:74)
67     ... 47 more

解决方法：

在pojo类上添加@NoArgsConstructor添加空参构造即可

NoArgsConstructor

posted @ 2020-06-14 01:30  hxiuz  阅读(1006)  评论(1)    收藏  举报