MyBatis Error: Org.apache.ibatis.exceptions.PersistenceException solution _mysql

MyBatis Error: Org.apache.ibatis.exceptions.PersistenceException solution

I. Description of the problem

Write the configuration file to test with JUnit, and the error will be the first run:

Org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause:org.apache.ibatis.reflection.ReflectionException:Error instantiating class Com.fendo.entity.Person with Invalid types () or values (). Cause:java.lang.nosuchmethodexception:com.fendo.entity.person.<init> () ### the error may exist in com/fendo/ Entity/person.xml ### The error may involve Defaultparametermap ### the error occurred while setting parameters ### SQL : SELECT * FROM person ### Cause:org.apache.ibatis.reflection.ReflectionException:Error instantiating class COM.FENDO.E Ntity. Person with invalid types () or values (). Cause:java.lang.nosuchmethodexception:com.fendo.entity.person.<init> () at Org.apache.ibatis.exceptions.ExceptionFactory.wrapException (exceptionfactory.java:23) at Org.apache.ibatis.session.defaults.DefaultSqlSession.selectList (defaultsqlsession.java:107) at Org.apache.ibatis.session.defaults.DefaultSqlSession.selectList (defaultsqlsession.java:98) at Org.apache.ibatis.binding.MapperMethod.executeForMany (mappermethod.java:114) at Org.apache.ibatis.binding.MapperMethod.execute (mappermethod.java:58) at Org.apache.ibatis.binding.MapperProxy.invoke (mapperproxy.java:43) at Com.sun.proxy. $Proxy 6.getPersons (Unknown Source) at Com.fendo.test.TestMybatis.test (testmybatis.java:40) at Sun.reflect.NativeMethodAccessorImpl.invoke0 ( Native to Sun.reflect.NativeMethodAccessorImpl.invoke (nativemethodaccessorimpl.java:62) at Sun.reflect.Dele Gatingmethodaccessorimpl.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.internal.runners.statements.RunAfters.evaluate (runafters.java:27) 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:675) 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:Error instantiating class Com.fendo.entity.Person with invalid Types () or values (). Cause:java.lang.nosuchmethodexception:com.fendo.entity.person.<init> () at Org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass (defaultobjectfactory.java:83) at Org.apache.ibatis.reflection.factory.DefaultObjectFactory.create (defaultobjectfactory.java:45) at Org.apache.ibatis.reflection.factory.DefaultObjectFactory.create (defaultobjectfactory.java:38) at Org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createREsultobject (defaultresultsethandler.java:535) at Org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject (Defaultresultsethandler.java : 514) at Org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue (Defaultresultsethandler.java : 334) at Org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap ( defaultresultsethandler.java:294) at 
  Org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues (defaultresultsethandler.java:269) At Org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet (Defaultresultsethandler.java : 239) at Org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets ( defaultresultsethandler.java:153) at Org.apache.ibatis.executor.statement.PreparedStatementHandler.query ( preparedstatementhandler.java:57) at Org.apache.ibatis.executor.statement.RoutingStatementHandler.query ( ROUTINGSTATEMENTHANDLER.JAVA:70) at Org.apache.ibaTis.executor.SimpleExecutor.doQuery (simpleexecutor.java:57) at Org.apache.ibatis.executor.BaseExecutor.queryFromDatabase (baseexecutor.java:259) at Org.apache.ibatis.executor.BaseExecutor.query (baseexecutor.java:132) at Org.apache.ibatis.executor.CachingExecutor.query (cachingexecutor.java:105) at Org.apache.ibatis.executor.CachingExecutor.query (cachingexecutor.java:81) at Org.apache.ibatis.session.defaults.DefaultSqlSession.selectList (defaultsqlsession.java:104) ... caused By:java.lang.nosuchmethodexception:com.fendo.entity.person.<init> () at java.lang.Class.getCons Tructor0 (class.java:3082) at Java.lang.Class.getDeclaredConstructor (class.java:2178) at Org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass (defaultobjectfactory.java:57) ... 

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Ii. Solutions

From the above anomalies can be seen: java.lang.nosuchmethodexception:com.fendo.entity.person.<init> ()

Person this entity class can not initialize, could not initialize the reason is not constructed method, and then I looked at the next class does not have the construction method, for him to add a construction method, it is OK.

Thank you for reading, I hope to help you, thank you for your support for this site!