Java Config @Bean 未在其他 @Configuration 类中自动装配

Java Config @Bean not autowired in other @Configuration class

提问by ProGig

Trying to setup a Spring 4 web application with Java Config, I encounter a problem with autowiring a bean created in a configuration class into another configuration class. The 'dataSource' bean has a null value in the MyBatisConfig class. This seems to be the only bean in the configuration that doesn't get wired properly. Looking at the Spring debug logs (see last part of logs in the last code block below) it looks instantiated properly, but also seems to be destroyed?. What could be wrong in my configuration?

尝试使用 Java Config 设置 Spring 4 Web 应用程序时，我遇到了将在配置类中创建的 bean 自动装配到另一个配置类的问题。'dataSource' bean 在 MyBatisConfig 类中有一个空值。这似乎是配置中唯一没有正确连接的 bean。查看 Spring 调试日志（请参阅下面最后一个代码块中日志的最后一部分），它看起来已正确实例化，但似乎也已被破坏？。我的配置可能有什么问题？

PropertySourcesPlaceholderConfigurerConfig class:

PropertySourcesPlaceholderConfigurerConfig 类：

package nl.somesite.teamshot.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.core.io.ClassPathResource;

@Configuration
public class PropertySourcesPlaceholderConfigurerConfig {

    @Bean
    public PropertySourcesPlaceholderConfigurer propertyConfigurer() {
        PropertySourcesPlaceholderConfigurer propertyConfigurer = new PropertySourcesPlaceholderConfigurer();

        propertyConfigurer.setLocation(new ClassPathResource("application.properties"));
        /*propertyConfigurer.setLocation(new ClassPathResource("file:${catalina.home}/conf/application.properties"));
        propertyConfigurer.setLocation(new ClassPathResource("/var/lib/openshift/517874b8e0b8cd218e000391/app-root/data/apache-tomcat-7.0.39/conf/application.properties"));*/

        propertyConfigurer.setIgnoreUnresolvablePlaceholders(false);
        propertyConfigurer.setIgnoreResourceNotFound(true);
        return propertyConfigurer;
    }

}

DbConfig class:

DbConfig 类：

package nl.somesite.teamshot.config;
import org.apache.commons.dbcp.BasicDataSource;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

@Configuration
@Import({PropertySourcesPlaceholderConfigurerConfig.class})
public class DbConfig {

    private @Value("jdbc:mysql://${OPENSHIFT_MYSQL_DB_HOST}:${OPENSHIFT_MYSQL_DB_PORT}/${OPENSHIFT_MYSQL_DATABASE}") String url;
    private @Value("${OPENSHIFT_MYSQL_DB_USERNAME}") String username;
    private @Value("${OPENSHIFT_MYSQL_DB_PASSWORD}") String password;

    static Logger log = LogManager.getLogger(DbConfig.class.getName());

    @Bean
    public BasicDataSource dataSource() {
        log.debug("Creating dataSource bean, url =  "+ url);

        BasicDataSource dataSource = new BasicDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        dataSource.setDefaultAutoCommit(false);

        log.debug("dataSource bean url = "+ dataSource.getUrl());
        return dataSource;
    }

}

MyBatisConfig class:

MyBatisConfig 类：

package nl.somesite.teamshot.config;
import java.io.IOException;
import org.apache.commons.dbcp.BasicDataSource;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

@Configuration
@Import({DbConfig.class})
public class MyBatisConfig {

    @Autowired private BasicDataSource dataSource;


    static Logger log = LogManager.getLogger(MyBatisConfig.class.getName());

    @Bean
    public SqlSessionFactoryBean sqlSessionFactory() {
        log.debug("Creating SqlSessionFactoryBean, dataSource = " + dataSource);

        SqlSessionFactoryBean sqlSessionFactory =  new SqlSessionFactoryBean();
        sqlSessionFactory.setDataSource(dataSource);
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();

        org.springframework.core.io.Resource[] classPathResources;
        try {
            classPathResources = resolver.getResources("classpath*:/mappers/*.xml");
            sqlSessionFactory.setMapperLocations(classPathResources);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return sqlSessionFactory;
    }

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        log.debug("Creating MapperScannerConfigurer");
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setBasePackage("nl.somesite.teamshot.data");
        return mapperScannerConfigurer;
    }

}

AppConfig class:

AppConfig 类：

package nl.somesite.teamshot.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan(basePackages = {"nl.somesite.teamshot.config"})
public class AppConfig {

}

AppInitializer class:

AppInitializer 类：

package nl.somesite.teamshot.initializer;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class AppInitializer implements WebApplicationInitializer {

    private static final String CONFIG_LOCATION = "nl.somesite.teamshot.config";
    private static final String MAPPING_URL = "/";

    static Logger log = LogManager.getLogger(AppInitializer.class.getName());

    public void onStartup(ServletContext servletContext) throws ServletException {
        WebApplicationContext context = getContext();
        servletContext.addListener(new ContextLoaderListener(context));
        ServletRegistration.Dynamic dispatcher = servletContext.addServlet("DispatcherServlet", new DispatcherServlet(context));
        dispatcher.setLoadOnStartup(1);
        dispatcher.addMapping(MAPPING_URL);
    }

    private AnnotationConfigWebApplicationContext getContext() {
        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
        context.setConfigLocation(CONFIG_LOCATION);
        return context;
    }

}

WebMvcConfig class:

WebMvcConfig 类：

package nl.somesite.teamshot.config;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;


@Configuration
@EnableWebMvc
public class WebMvcConfig extends WebMvcConfigurerAdapter {


    static Logger log = LogManager.getLogger(WebMvcConfig.class.getName());

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Bean
    public ViewResolver internalResourceViewResolver() {
        InternalResourceViewResolver resolver =  new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        return resolver;
    }

}

Last part of logs:

日志的最后一部分：

[DEBUG:] 2014-07-09 01:25:20 [DefaultSingletonBeanRegistry line:220] Creating shared instance of singleton bean 'dataSource'  
    [DEBUG:] 2014-07-09 01:25:20 [AbstractAutowireCapableBeanFactory line:449] Creating instance of bean 'dataSource'  
    [DEBUG:] 2014-07-09 01:25:20 [AbstractBeanFactory line:249] Returning cached instance of singleton bean 'dbConfig'  
    [DEBUG:] 2014-07-09 01:25:20 [DbConfig line:25] Creating dataSource bean, url =  jdbc:mysql://localhost:3306/teamshot?useUnicode=true&characterEncoding=UTF-8  
    [DEBUG:] 2014-07-09 01:25:20 [DbConfig line:34] dataSource bean url = jdbc:mysql://localhost:3306/teamshot?useUnicode=true&characterEncoding=UTF-8  
    [DEBUG:] 2014-07-09 01:25:20 [AbstractAutowireCapableBeanFactory line:523] Eagerly caching bean 'dataSource' to allow for resolving potential circular references  
    [DEBUG:] 2014-07-09 01:25:20 [AbstractAutowireCapableBeanFactory line:477] Finished creating instance of bean 'dataSource'  
    [DEBUG:] 2014-07-09 01:25:20 [DefaultSingletonBeanRegistry line:220] Creating shared instance of singleton bean 'sqlSessionFactory'  
    [DEBUG:] 2014-07-09 01:25:20 [AbstractAutowireCapableBeanFactory line:449] Creating instance of bean 'sqlSessionFactory'  
    [DEBUG:] 2014-07-09 01:25:20 [AbstractBeanFactory line:249] Returning cached instance of singleton bean 'myBatisConfig'  
    [DEBUG:] 2014-07-09 01:25:20 [MyBatisConfig line:27] Creating SqlSessionFactoryBean, dataSource = null  
    [DEBUG:] 2014-07-09 01:25:20 [PathMatchingResourcePatternResolver line:553] Looking for matching resources in directory tree [D:\Eclipse workspaces\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\teamshot\WEB-INF\classes\mappers]  
    [DEBUG:] 2014-07-09 01:25:20 [PathMatchingResourcePatternResolver line:615] Searching directory [D:\Eclipse workspaces\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\teamshot\WEB-INF\classes\mappers] for files matching pattern [D:/Eclipse workspaces/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/teamshot/WEB-INF/classes/mappers/*.xml]  
    [DEBUG:] 2014-07-09 01:25:20 [PathMatchingResourcePatternResolver line:354] Resolved location pattern [classpath*:/mappers/*.xml] to resources [file [D:\Eclipse workspaces\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\teamshot\WEB-INF\classes\mappers\newsitems.xml], file [D:\Eclipse workspaces\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\teamshot\WEB-INF\classes\mappers\teams.xml]]  
    [DEBUG:] 2014-07-09 01:25:20 [AbstractAutowireCapableBeanFactory line:523] Eagerly caching bean 'sqlSessionFactory' to allow for resolving potential circular references  
    [DEBUG:] 2014-07-09 01:25:20 [AbstractAutowireCapableBeanFactory line:1595] Invoking afterPropertiesSet() on bean with name 'sqlSessionFactory'  
    [DEBUG:] 2014-07-09 01:25:20 [DefaultSingletonBeanRegistry line:474] Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@3278a91: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,appConfig,dbConfig,myBatisConfig,propertySourcesPlaceholderConfigurerConfig,webMvcConfig,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor.enhancedConfigurationProcessor,dataSource,sqlSessionFactory,mapperScannerConfigurer,propertyConfigurer,org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration,requestMappingHandlerMapping,mvcContentNegotiationManager,viewControllerHandlerMapping,beanNameHandlerMapping,resourceHandlerMapping,defaultServletHandlerMapping,requestMappingHandlerAdapter,mvcConversionService,mvcValidator,mvcUriComponentsContributor,httpRequestHandlerAdapter,simpleControllerHandlerAdapter,handlerExceptionResolver,internalResourceViewResolver,newsItemMapper,teamMapper]; root of factory hierarchy  
    [DEBUG:] 2014-07-09 01:25:20 [DisposableBeanAdapter line:322] Invoking destroy method 'close' on bean with name 'dataSource'  
    [DEBUG:] 2014-07-09 01:25:20 [DisposableBeanAdapter line:244] Invoking destroy() on bean with name 'webMvcConfig'  
    [DEBUG:] 2014-07-09 01:25:20 [DisposableBeanAdapter line:244] Invoking destroy() on bean with name 'dbConfig'  
    [DEBUG:] 2014-07-09 01:25:21 [DisposableBeanAdapter line:244] Invoking destroy() on bean with name 'appConfig'  
    [DEBUG:] 2014-07-09 01:25:21 [DisposableBeanAdapter line:244] Invoking destroy() on bean with name 'propertySourcesPlaceholderConfigurerConfig'  
    [ERROR:] 2014-07-09 01:25:21 [ContextLoader line:331] Context initialization failed Error creating bean with name 'sqlSessionFactory' defined in class path resource [nl/somesite/teamshot/config/MyBatisConfig.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Property 'dataSource' is required 
    jul 09, 2014 1:25:21 AM org.apache.catalina.core.StandardContext listenerStart
    SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [nl/somesite/teamshot/config/MyBatisConfig.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Property 'dataSource' is required
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1553)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getObject(AbstractBeanFactory.java:304)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:681)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
        at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
        at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4887)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5381)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:724)
    Caused by: java.lang.IllegalArgumentException: Property 'dataSource' is required
        at org.springframework.util.Assert.notNull(Assert.java:112)
        at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:337)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1612)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1549)
        ... 22 more

If I disable Spring debug logging I see this:

如果我禁用 Spring 调试日志记录，我会看到：

[DEBUG:] 2014-07-09 11:02:19 [MyBatisConfig line:50] Creating MapperScannerConfigurer  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [DbConfig line:24] Creating dataSource bean, url =  jdbc:mysql://localhost:3306/teamshot?useUnicode=true&characterEncoding=UTF-8  
[DEBUG:] 2014-07-09 11:02:20 [DbConfig line:33] dataSource bean url = jdbc:mysql://localhost:3306/teamshot?useUnicode=true&characterEncoding=UTF-8  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[DEBUG:] 2014-07-09 11:02:20 [MyBatisConfig line:30] Creating SqlSessionFactoryBean, dataSource = null  
[ERROR:] 2014-07-09 11:02:20 [ContextLoader line:331] Context initialization failed Error creating bean with name 'sqlSessionFactory' defined in class path resource [nl/somesite/teamshot/config/MyBatisConfig.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Property 'dataSource' is required 

采纳答案by ProGig

After reading a lot of Spring related stuff I discovered that the MapperScannerConfigurer is a implementation of BeanFactoryPostProcessor. Having a BeanFactoryPostProcessor in a @Configuration class breaks the default post-processing of that @Configuration class.

在阅读了很多与 Spring 相关的东西后，我发现 MapperScannerConfigurer 是 BeanFactoryPostProcessor 的实现。在 @Configuration 类中使用 BeanFactoryPostProcessor 会破坏该 @Configuration 类的默认后处理。

There is a fundamental lifecycle conflict in handling BeanFactoryPostProcessor @Bean methods within @Configuration classes that use @Autowired, @PostConstruct, @Value, etc. Because BFPPs must be instantiated early in the lifecycle, they cause early instantiation of their declaring @Configuration class - too early to recieve the usual post-processing by AutowiredAnnotationBeanPostProcessor and friends. See https://jira.spring.io/browse/SPR-8269

在使用@Autowired、@PostConstruct、@Value 等的@Configuration 类中处理BeanFactoryPostProcessor @Bean 方法时存在基本的生命周期冲突。因为BFPP 必须在生命周期的早期实例化，它们会导致声明@Configuration 类的早期实例化 - AutowiredAnnotationBeanPostProcessor 和朋友接受通常的后处理还为时过早。见https://jira.spring.io/browse/SPR-8269

Separating the MapperScannerConfigurer bean method from MyBatisConfig into it's own class solves the problem.

将 MapperScannerConfigurer bean 方法从 MyBatisConfig 分离到它自己的类中解决了这个问题。

回答by Aeseir

EDIT 1:

编辑 1：

Based on further input change the following:

根据进一步的输入更改以下内容：

@Bean
public BasicDataSource dataSource() {}

TO

到

@Bean
public DataSource dataSource() {}

You should really setup session factory and db all in one class. Make life easier for yourself.

你真的应该在一个班级中设置会话工厂和数据库。让自己的生活更轻松。

Great example is here:

很好的例子在这里：

http://www.baeldung.com/hibernate3-spring

http://www.baeldung.com/hibernate3-spring

回答by Matthew Smith

Instead of creating a MapperScannerConfigurer bean, wouldn't this be simplified by using the annotation?

而不是创建一个 MapperScannerConfigurer bean，这不是通过使用注释来简化吗？

@MapperScan("com.acme.base.package")

回答by user5738943

use annotation @AutoConfigureAfter in org.springframework.boot:spring-boot-autoconfigure

使用注解@AutoConfigureAfter org.springframework.boot:spring-boot-autoconfigure

@Configuration
@AutoConfigureAfter({DataSourceAutoConfiguration.class})  
public class MybatisConfig {
...
}