spring错误没有JdbcTemplate类型的限定bean

Question

我有一个 spring boot 应用程序，我在配置中手动创建 Datasource 和 JdbcTemplate 因为我需要解密数据源密码。

我正在使用 tomcat DataSource (org.apache.tomcat.jdbc.pool.DataSource) 作为 spring boot 文档中的推荐，因为我正在配置连接属性。

我排除了数据源的自动配置(请参阅 Application.java)，因为我是手动创建的。

应用程序.java

// exclude datasourceAutoConfiguration since we are creating manaully creating datasource bean in AppConfig
@SpringBootApplication
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

这是我的application.properties 文件

jdbc.hostdb.url=jdbc:jtds:sqlserver://hello-world:1122/foobar
host.jdbc.hostdb.username=foo
host.jdbc.hostdb.password=encryptedPassword
host.jdbc.hostdb.driver=net.sourceforge.jtds.jdbc.Driver
secret=afasdfansdfsdfsd

AppConfig.java

import org.apache.tomcat.jdbc.pool.DataSource;

@ComponentScan("com.company.foo")
public class AppConfig {


    @Value("${jdbc.hostdb.driver}")
    private String driver;

    @Value("${jdbc.hostdb.url}")
    private String url;

    @Value("${jdbc.hostdb.username}")
    private String user;

    @Value("${jdbc.hostdb.password}")
    private String pass;

    @Value("${secret}")
    private String secret;


    @Bean
    public DataSource datasource_mydb(Encryption encryption) {
        DataSource ds = new DataSource();
        ds.setDriverClassName(hostdb_driver);
        ds.setUrl(hostdb_url);
        ds.setUsername(hostdb_user);
        ds.setPassword(encryption.decrypt(hostdb_pass));
        return ds;
    }


    @Bean
    Encryption encryption() {
        return new Encryption(secret);
    }

    @Bean
    public JdbcTemplate jdbcTemplate(DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

}

MyRepository.java

@Repository
public class MyRepository {

    JdbcTemplate jdbcTemplate;

    @Autowired
    public MyRepository(JdbcTemplate jdbcTemplate){
        this.jdbcTemplate=jdbcTemplate;
    }
}

当我启动spring容器时，出现如下错误

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'MyRepository' defined in file [/Users//Documents/codebase/my-service/build/classes/main/com/company/foo/MyRepository.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [org.springframework.jdbc.core.JdbcTemplate]: No qualifying bean of type [org.springframework.jdbc.core.JdbcTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.jdbc.core.JdbcTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:185) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1143) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1046) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.6.RELEASE.jar:1.3.6.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:760) [spring-boot-1.3.6.RELEASE.jar:1.3.6.RELEASE]
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:360) [spring-boot-1.3.6.RELEASE.jar:1.3.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:306) [spring-boot-1.3.6.RELEASE.jar:1.3.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1185) [spring-boot-1.3.6.RELEASE.jar:1.3.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1174) [spring-boot-1.3.6.RELEASE.jar:1.3.6.RELEASE]
    at com.concur.cognos.authentication.Application.main(Application.java:14) [main/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_102]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_102]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_102]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_102]
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) [idea_rt.jar:na]
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.jdbc.core.JdbcTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1373) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1119) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    ... 24 common frames omitted

2016-07-26 1

Answer 1

问题出在你的 bean 定义的参数上。他们的值(value)观从何而来？例如-

@Bean
public JdbcTemplate jdbcTemplate(DataSource dataSource) {
    return new JdbcTemplate(dataSource);
}

这里您没有指定 dataSource 参数的值从何而来。 datasource_mydb bean 的情况相同。在接受其他 bean 作为输入参数的 bean 定义上使用 @Autowire。

@Bean
@Autowired
public DataSource datasource_mydb(Encryption encryption) {
    DataSource ds = new DataSource();
    ds.setDriverClassName(hostdb_driver);
    ds.setUrl(hostdb_url);
    ds.setUsername(hostdb_user);
    ds.setPassword(encryption.decrypt(hostdb_pass));
    return ds;
}


@Bean
Encryption encryption() {
    return new Encryption(secret);
}

@Bean
@Autowired
@Qualifier("datasource_mydb")
public JdbcTemplate jdbcTemplate(DataSource dataSource) {
    return new JdbcTemplate(dataSource);
}