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 Autowiring 到另一个配置类中的问题。 'dataSource' bean 在 MyBatisConfig 类中有一个空值。这似乎是配置中唯一未正确连接的 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，但似乎也被破坏了？我的配置可能有什么问题？
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:${catalina.home}/conf/application.properties"));
propertyConfigurer.setLocation(new ClassPathResource("/var/lib/openshift/517874b8e0b8cd218e000391/app-root/data/apache-tomcat-7.0.39/conf/application.properties"));*/
propertyConfigurer.setIgnoreUnresolvablePlaceholders(false);
propertyConfigurer.setIgnoreResourceNotFound(true);
return propertyConfigurer;
}
}
DbConfig 类:
package nl.somesite.teamshot.config;
import org.apache.commons.dbcp.BasicDataSource;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
@Configuration
@Import({PropertySourcesPlaceholderConfigurerConfig.class})
public class DbConfig {
private @Value("jdbc:mysql://${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 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 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 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 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;
}
}
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$1.getObject(AbstractBeanFactory.java:304)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:681)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4887)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5381)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$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
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
最佳答案
在阅读了很多与 Spring 相关的内容之后，我发现 MapperScannerConfigurer 是 BeanFactoryPostProcessor 的一个实现。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
将 MapperScannerConfigurer bean 方法从 MyBatisConfig 分离到它自己的类中解决了这个问题。
关于Java Config @Bean 未在其他 @Configuration 类中 Autowiring ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24643426/
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