我正在使用 Spring boot、Mybatis(spring 和生成器)构建一个独立的应用程序，我认为我配置了一切正常，但 Autowiring 的映射器为空，并且在调用它时出现 AbstractMethodError 。
实际上我认为这是因为空映射器。我一直在寻找它，并遵循了所有可能的解决方案，但没有任何效果。
关于代码:我也在使用JavaFX，但这对我的问题没有任何影响。
my.project.core.Main.java
@SpringBootApplication
@MapperScan({"my.project.persistence"})
public class Main extends Application{
private ConfigurableApplicationContext springContext;
public static void main(String[] args){
launch(args);
}
public void start(Stage stage) throws Exception {
springContext = new AnnotationConfigApplicationContext(SpringConfiguration.class);
//Some code to display the views
System.out.println("test 1: " + springContext.getBean(UsuarioMapper.class));
stage.show();
}
}
(使用 MyBatis-Generator 生成的 DAO) my.project.persistence.UsuarioMapper.java
@Mapper //I've also tried @Component
public interface UsuarioMapper {
int countByExample(UsuarioExample example);
int deleteByExample(UsuarioExample example);
int deleteByPrimaryKey(String codUsuario);
int insert(UsuarioBean record);
//Etc etc etc
}
(服务)my.project.services.ServicioUsuario.java
@Service
public class ServicioUsuario {
@Autowired private UsuarioMapper usuarioMapper;
public boolean userExists(String user){
System.out.println("test 2: " + usuarioMapper);
UsuarioBean bean = usuarioMapper.selectByPrimaryKey(user);
return bean!=null;
}
}
(配置)my.project.config.SpringConfiguration.java
@Configuration
public class SpringConfiguration {
/*========== SERVICES ==========*/
@Bean
public ServicioUsuario servicioUsuario() throws Exception{
return new ServicioUsuario();
}
/*========== DAO ==========*/
//I've already tried passing userMapper().getObject() in ServicioUsuario
//constructor, but the output is the same, null mapper
@Bean
public MapperFactoryBean<UsuarioMapper> userMapper() throws Exception {
MapperFactoryBean<UsuarioMapper> factoryBean = new MapperFactoryBean<UsuarioMapper>(UsuarioMapper.class);
factoryBean.setSqlSessionFactory(sqlSessionFactory());
return factoryBean;
/*========== CONNECTION ==========*/
@Bean
public DataSource dataSource() throws ClassNotFoundException, SQLException{
OracleDataSource dataSource = new OracleDataSource();
dataSource.setDriverType("thin");
dataSource.setServerName("localhost");
dataSource.setDatabaseName("xe");
dataSource.setPortNumber(1521);
dataSource.setUser("testuser");
dataSource.setPassword("pass123");
Class.forName("oracle.jdbc.driver.OracleDriver");
return dataSource;
}
@Bean
public SqlSessionFactory sqlSessionFactory() throws Exception {
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource());
SqlSessionFactory sqlSessionFactory = factoryBean.getObject();
return sqlSessionFactory;
}
@Bean
public DataSourceTransactionManager transactionManager() throws ClassNotFoundException, SQLException {
return new DataSourceTransactionManager(dataSource());
}
@Bean
public SqlSessionTemplate sqlSession() throws Exception {
return new SqlSessionTemplate(sqlSessionFactory());
}
}
输出(摘要):
18:30:41.023 [JavaFX Application Thread] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'springConfiguration'
18:30:41.095 [JavaFX Application Thread] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'servicioUsuario'
18:30:41.096 [JavaFX Application Thread] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'userMapper'
18:30:41.097 [JavaFX Application Thread] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'sqlSessionFactory'
18:30:41.107 [JavaFX Application Thread] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'dataSource'
18:30:41.231 [JavaFX Application Thread] DEBUG org.mybatis.spring.SqlSessionFactoryBean - Property 'configuration' or 'configLocation' not specified, using default MyBatis Configuration
18:30:41.273 [JavaFX Application Thread] DEBUG org.mybatis.spring.SqlSessionFactoryBean - Property 'mapperLocations' was not specified or no matching resources found
18:30:41.481 [JavaFX Application Thread] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'transactionManager'
18:30:41.490 [JavaFX Application Thread] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'sqlSession'
test 1: null
test 2: null
18:32:26.250 [JavaFX Application Thread] DEBUG org.mybatis.spring.SqlSessionUtils - Creating a new SqlSession
18:32:26.501 [JavaFX Application Thread] DEBUG java.sql.Connection - ooo Connection Opened
//And now the full stacktrace
Exception in thread "JavaFX Application Thread" java.lang.AbstractMethodError: org.mybatis.spring.transaction.SpringManagedTransactionFactory.newTransaction(Ljava/sql/Connection;Z)Lorg/apache/ibatis/transaction/Transaction;
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:77)
at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:40)
at org.mybatis.spring.SqlSessionUtils.getSqlSession(SqlSessionUtils.java:100)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:428)
at com.sun.proxy.$Proxy14.selectOne(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166)
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:66)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:35)
at com.sun.proxy.$Proxy15.selectByPrimaryKey(Unknown Source)
at my.project.services.ServicioUsuario.userExists(ServicioUsuario.java:42)
at my.project.gui.LoginController.btAceptar(LoginController.java:70)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8411)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:432)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:410)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$3(WinApplication.java:177)
at java.lang.Thread.run(Unknown Source)
我应该实现 MyBatis Generator 生成的映射器接口(interface)吗？我是否有任何bean配置错误？我已经尝试了所有方法，但映射器只想保持为空。谢谢。
最佳答案
堆栈跟踪清楚地表明映射器已被注入(inject)并且它不为空:
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:35)
at com.sun.proxy.$Proxy15.selectByPrimaryKey(Unknown Source)
at my.project.services.ServicioUsuario.userExists(ServicioUsuario.java:42)
这些行表明映射器的调用确实发生了，但它不是 null .
出现这个错误是因为mybatis和spring版本不兼容-mybatis和spring.
您需要检查真正使用的这些库的版本(maven 和 gradle 的实际执行方式有所不同)并确保它们全部兼容。您可以使用this site检查这一点。
例如此页面https://mvnrepository.com/artifact/org.mybatis/mybatis-spring/2.0.3我可以看到mybatis-spring版本2.0.3使用spring版本5.1.10.RELEASE和mybatis版本 3.5.3 。然后，将其与构建工具(mvn 或 gradle)解析的实际依赖项版本进行比较。
对于 gradle，这是通过 dependencies 完成的任务。
供 Maven 使用 dependencies插件。
关于java - 在服务中调用 DAO 时出现 AbstractMethodError 和 null maper，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58698521/