Question

我想将MongoDB用于带有spring-boot和JPA的mongoDB。我可以使用嵌入式H2数据库。但我不确定使用mongo-db会出现什么问题。在运行应用程序时，我收到数据源丢失的错误。

@EnableAutoConfiguration
@EnableJpaRepositories(basePackages = "com..........repo")
@EnableWebMvc
@Configuration
@ComponentScan
@Import({ SpringMongoConfig.class, RepositoryRestMvcConfiguration.class })
public class Bootstrap extends SpringBootServletInitializer {

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

   @Override
   protected SpringApplicationBuilder configure(
           SpringApplicationBuilder application) {
       return application.sources(Bootstrap.class);
   }
}

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.data.mongodb.config.AbstractMongoConfiguration;
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;

import com.mongodb.Mongo;
import com.mongodb.MongoClient;

@Configuration
@EnableMongoRepositories(basePackages = "com.............repo")
@PropertySource(value = "classpath:mongo-config.properties")
public class SpringMongoConfig extends AbstractMongoConfiguration {

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

@Value("${MONGO_DB_PORT}")
private int MONGO_DB_PORT;

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

@Override
protected String getDatabaseName() {
    return DB;
}

@Bean
@Override
public Mongo mongo() throws Exception {
    return new MongoClient(MONGO_DB_HOST, MONGO_DB_PORT);
}

}


org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private javax.sql.DataSource org.springframework.boot.autoconfigure.orm.jpa.JpaBaseConfiguration.dataSource; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration$NonEmbeddedConfiguration.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public javax.sql.DataSource org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$NonEmbeddedConfiguration.dataSource()] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath.
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:293)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1186)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
     ..........................
     Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private javax.sql.DataSource org.springframework.boot.autoconfigure.orm.jpa.JpaBaseConfiguration.dataSource; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration$NonEmbeddedConfiguration.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public javax.sql.DataSource org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$NonEmbeddedConfiguration.dataSource()] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath.
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:509)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:290)
    ... 25 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration$NonEmbeddedConfiguration.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public javax.sql.DataSource org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$NonEmbeddedConfiguration.dataSource()] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath.
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:597)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1095)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:990)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
....................................
     Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public javax.sql.DataSource org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$NonEmbeddedConfiguration.dataSource()] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath.
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:188)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:586)
    ... 39 common frames omitted
     Caused by: org.springframework.beans.factory.BeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath.
    at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.getDriverClassName(DataSourceProperties.java:93)
    at org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$NonEmbeddedConfiguration.dataSource(DataSourceAutoConfiguration.java:105)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Answer 1

对于初学者来说，使用框架Spring Boot会为它检测到的框架进行自动配置。这包括Spring Data JPA和Spring Data Mongo。因此，您可以删除@Enable注释。

Spring MVC和Spring Data Rest也是如此。

要允许Spring Boot配置Spring Mongo，请将以下属性添加到application.properties

spring.data.mongodb.host= # the db host
spring.data.mongodb.port=27017 # the connection port (defaults to 27107)

或

spring.data.mongodb.uri=mongodb://localhost/test # connection URL

有关Spring Boot Mongo支持的更多信息，请参阅Spring Boot Reference Guide的this section。

如果不使用嵌入式数据源，则必须指定要使用的驱动程序，将以下属性添加到application.properties。这也在Spring Boot Reference Guide的this section中有记录。

spring.datasource.driverClassName = your.driver.class

我建议将您的Bootstrap类移到顶级包并删除所有不需要的注释和配置文件

@EnableAutoConfiguration
@Configuration
@ComponentScan
public class Bootstrap extends SpringBootServletInitializer {

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

   @Override
   protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
       return application.sources(Bootstrap.class);
   }
}

足以引导您的整个应用程序，包括jpa，mongo和Web支持。

对于一个非常完整的列表，我建议使用Spring Boot Reference Guide Appendix A。

Spring Boot和Spring Data REST中的MongoDB配置

1 个答案: