Question

我有一个相当大的应用程序，试图将.xml bean定义转换为Java批注。该应用程序分为多个子项目，其中一个是Web应用程序（Tomcat），另一个是被编译为jar并放在Web应用程序类路径中的库。

在这些子项目库之一中，我有一个Spring配置类，用于定义SessionFactory bean。在许多DAO实现中，该bean都是自动装配的。但是，每当我尝试启动我的应用程序时，Spring都无法创建DAO的bean，因为它找不到SessionFactory bean。我得到了很长的堆栈跟踪，最后带有NoSuchBeanDefinitionException。

在Web应用程序子项目中，我尝试更改组件扫描以首先使用SessionFactoryConfig.java扫描该程序包，然后再使用定义的其他程序进行扫描。发生相同的错误，但是它尝试创建的bean不同。在与SessionFactoryConfig.java相同的程序包中还有另一个配置类，该类可以自动装配SessionFactory bean，但是无法创建而不是DAO。

SessionFactoryConfig.java

@Configuration
public class SessionFactoryConfig {

    @Autowired
    private DataSource dataSource;

    @Bean
    public SessionFactory sessionFactory() {
        LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
        localSessionFactoryBean.setDataSource(dataSource);
        localSessionFactoryBean.setPackagesToScan("com.mycompany.model", "com.mycompany.extra.model");

        Properties properties = new Properties();
        properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");
        properties.setProperty("hibernate.show_sql", "false");
        properties.setProperty("hibernate.connection.release_mode", "after_transaction");
        properties.setProperty("hibernate.transaction.factory_class", "org.hibernate.transaction.JDBCTransactionFactory");
        properties.setProperty("hibernate.cache.use_query_cache", "true");
        properties.setProperty("hibernate.generate_statistics", "false");
        properties.setProperty("hibernate.max_fetch_depth", "2");
        properties.setProperty("hibernate.cache.use_second_level_cache", "false");
        properties.setProperty("hibernate.cache.use_structured_entries", "true");
        localSessionFactoryBean.setHibernateProperties(properties);

        return localSessionFactoryBean.getObject();
    }
}

堆栈跟踪的底部

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.hibernate.SessionFactory' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1654)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1252)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
    ... 28 more

项目布局和组件扫描

project_root
+-- dao
|   +-- src/main/java
|       +-- com
|           +-- mycompany
|               +-- dao
|                   +-- config
|                   |   +-- DataSourceConfig.java
|                   |   +-- SessionFactoryConfig.java
|                   |   +-- TransactionConfig.java
|                   +-- impl
|                       +-- <Each model>DaoImpl.java
+-- web_server
    +-- src/main/webapp
        +-- WEB-INF
            +-- web.xml
            +-- applicationContext.xml
            +-- <others>.xml

web.xml

...
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        /WEB-INF/applicationContext.xml
        /WEB-INF/applicationContext-security.xml
        /WEB-INF/applicationContext-security-jdbc.xml
        /WEB-INF/camelConfig.xml
    </param-value>
</context-param>
...

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:task="http://www.springframework.org/schema/task"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:amq="http://activemq.apache.org/schema/core"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
                        http://www.springframework.org/schema/beans/spring-beans.xsd 
                        http://www.springframework.org/schema/task 
                        http://www.springframework.org/schema/task/spring-task.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context.xsd
                        http://activemq.apache.org/schema/core
                        http://activemq.apache.org/schema/core/activemq-core-5.5.0.xsd
                        ">
    <context:component-scan base-package="com.mycompany" />
...

我也尝试过 <context:component-scan base-package="com.mycompany.dao.config, com.mycompany" />，没有运气。

Spring找不到bean：NoSuchBeanDefinitionException

0 个答案: