Mybatis报错 Error querying database. Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.me.mybatis.pojo.Orders with invalid types () or values ().

在学mybaits的时候遇到了这个错误，而且卡住了我三个小时也找不到，最后分析出来不能初始化类，然后就结合着之前自己以前的一点经验发现只有有参构造没有无参构造，因此只需要添加上无参构造就可以了。

错误源码

org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.  Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.me.mybatis.pojo.Orders with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.me.mybatis.pojo.Orders.<init>()
### The error may exist in SqlMap/Order.xml
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: select * from orders
### Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.me.mybatis.pojo.Orders with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.me.mybatis.pojo.Orders.<init>()
 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.$Proxy10.findAllOrders(Unknown Source)
 at com.me.mybatis.junit.MybatisMapperTest.testFindAllOrders(MybatisMapperTest.java:88)
 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.base/java.lang.reflect.Method.invoke(Method.java:567)
 at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:628)
 at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:117)
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:184)
 at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:180)
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:127)
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
 at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
 at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
 at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
 at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
 at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
 at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
 at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
 at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
 at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
 at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
 at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
 at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
 at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
 at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
 at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
 at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229)
 at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197)
 at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
 at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
 at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:137)
 at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:89)
 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)
Caused by: org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.me.mybatis.pojo.Orders with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.me.mybatis.pojo.Orders.<init>()
 at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:86)
 at org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:48)
 at org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:41)
 at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:528)
 at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:507)
 at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:331)
 at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:291)
 at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:266)
 at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:236)
 at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:150)
 at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:60)
 at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73)
 at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60)
 at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
 at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)
 at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)
 at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)
 at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
 ... 59 more
Caused by: java.lang.NoSuchMethodException: com.me.mybatis.pojo.Orders.<init>()
 at java.base/java.lang.Class.getConstructor0(Class.java:3355)
 at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2559)
 at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:60)
 ... 76 more

原文地址：https://www.cnblogs.com/tkg1314/p/12283827.html

时间： 2024-10-14 14:39:51

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