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Java 使用Spring Reactive（R2DBC）连接MSSQL，创建bean时出错

java spring

Java 使用Spring Reactive（R2DBC）连接MSSQL，创建bean时出错,java,spring,reactive-programming,spring-reactive,Java,Spring,Reactive Programming,Spring Reactive,我目前正在尝试与Microsoft SQL Server建立数据库连接。不幸的是，我不明白为什么它不起作用。不幸的是，错误信息不能给我准确的信息 初级班 @ComponentScan({ "com.example.web", "com.example.repository", "com.example.config", "com.example.domain" }) @SpringBootApplication public class R2Dbc3Application { publ

我目前正在尝试与Microsoft SQL Server建立数据库连接。不幸的是，我不明白为什么它不起作用。不幸的是，错误信息不能给我准确的信息

初级班

@ComponentScan({ "com.example.web", "com.example.repository", "com.example.config", "com.example.domain" })
@SpringBootApplication
public class R2Dbc3Application {

    public static void main(String[] args) {
        SpringApplication.run(R2Dbc3Application.class, args);
    }

}
数据库配置：

@Configuration
@EnableR2dbcRepositories("com.example.repository")
public class DatabaseConfiguration extends AbstractR2dbcConfiguration {

    private final Logger log = LoggerFactory.getLogger(DatabaseConfiguration.class);

    @Value("${spring.data.mssql.host}")
    private String host;

    @Value("${spring.data.mssql.database}")
    private String database;

    @Value("${spring.data.mssql.username}")
    private String username;

    @Value("${spring.data.mssql.password}")
    private String password;



    @Bean
    @Override
    public MssqlConnectionFactory connectionFactory() {

        System.out.println("Connecting to database" +  host);
        return new MssqlConnectionFactory(MssqlConnectionConfiguration.builder()
                .host(host)
                .port(1453)
                .database(database)
                .username(username)
                .password(password)
                .build());
    }
}
数据库初始值设定项：

@Component
public class DatabaseInitializer {

    private final Logger log = LoggerFactory.getLogger(DatabaseInitializer.class);

    @Autowired
    PersonRepository personRepository;

    public DatabaseInitializer(PersonRepository personRepository) {
        this.personRepository = personRepository;
    }

    @PostConstruct
    public void init() {
        log.info("Initializing database if necessary");
        personRepository.findAll().count().subscribe(count -> {
            if (count == 0) {
                log.info("Database is empty, inserting sample data");
                createPerson("Josh", "Long", "Pivotal");
                createPerson("Julien", "Dubois", "Microsoft");
            } else {
                log.info("Database is already initialized");
            }
        });
    }

    private void createPerson(String firstName, String lastName, String company) {
        Person person = new Person();
        person.setFirstName(firstName);
        person.setLastName(lastName);
        person.setCompany(company);
        personRepository.save(person).log().subscribe();
    }
}
域：

导入org.springframework.data.annotation.Id； 导入org.springframework.data.relational.core.mapping.Table

@表（“人”） 公共阶层人士{

@Id
private Long id;

private String firstName;

private String lastName;

private String company;

// getter und setter
存储库：

@Repository
public interface PersonRepository extends ReactiveCrudRepository<Person, Long> {
}
请为DatabaseClient添加一个bean，如下所示


    @Autowired
    private ConnectionFactory connectionFactory;

    @Bean
    public DatabaseClient databaseClient() {
        return create(connectionFactory);
    }
为了减少类的数量，您可以删除DatabaseConfiguration类并将下面的添加到application.properties中，Spring将负责创建connectionFactory

server.port=
spring.r2dbc.url=r2dbc:mssql:/<host>/<db-name>
spring.r2dbc.username=
spring.r2dbc.password=
spring.r2dbc.initialization-mode=always
spring.main.web-application-type=reactive

server.port=
spring.r2dbc.url=r2dbc:mssql://
spring.r2dbc.username=
spring.r2dbc.password=
spring.r2dbc.initialization mode=始终
spring.main.web应用程序类型=被动
除非有异常的目录结构或外部包，否则不需要进行componentScan。另外，能否提供完整的堆栈跟踪，同时显示“未能自检类[io.r2dbc.mssql.MSSQLSconnectionFactory]”异常？ 
2020-05-25 10:23:35.193  INFO 22532 --- [  restartedMain] com.example.app.R2Dbc3Application        : Starting R2Dbc3Application on 64LP0Z2 with PID 22532 (C:\tools\Spring-Tool-Suite\R2DBC3\target\classes started by kemal.sacirovic in C:\tools\Spring-Tool-Suite\R2DBC3)
2020-05-25 10:23:35.195  INFO 22532 --- [  restartedMain] com.example.app.R2Dbc3Application        : No active profile set, falling back to default profiles: default
2020-05-25 10:23:35.236  INFO 22532 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2020-05-25 10:23:35.237  INFO 22532 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2020-05-25 10:23:35.555  INFO 22532 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data R2DBC repositories in DEFAULT mode.
2020-05-25 10:23:35.588  INFO 22532 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 30ms. Found 1 R2DBC repository interfaces.
Connecting to databasedbtbln01
2020-05-25 10:23:35.930  WARN 22532 --- [  restartedMain] onfigReactiveWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'personController' defined in file [C:\tools\Spring-Tool-Suite\R2DBC3\target\classes\com\example\web\PersonController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personRepository': Cannot resolve reference to bean 'databaseClient' while setting bean property 'databaseClient'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'databaseClient' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Unsatisfied dependency expressed through method 'databaseClient' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reactiveDataAccessStrategy' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Unsatisfied dependency expressed through method 'reactiveDataAccessStrategy' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'r2dbcMappingContext' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Unsatisfied dependency expressed through method 'r2dbcMappingContext' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'r2dbcCustomConversions' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.r2dbc.convert.R2dbcCustomConversions]: Factory method 'r2dbcCustomConversions' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'connectionFactory' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [io.r2dbc.mssql.MssqlConnectionFactory] from ClassLoader [sun.misc.Launcher$AppClassLoader@764c12b6]
2020-05-25 10:23:35.947  INFO 22532 --- [  restartedMain] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-05-25 10:23:35.956 ERROR 22532 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'personController' defined in file [C:\tools\Spring-Tool-Suite\R2DBC3\target\classes\com\example\web\PersonController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personRepository': Cannot resolve reference to bean 'databaseClient' while setting bean property 'databaseClient'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'databaseClient' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Unsatisfied dependency expressed through method 'databaseClient' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reactiveDataAccessStrategy' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Unsatisfied dependency expressed through method 'reactiveDataAccessStrategy' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'r2dbcMappingContext' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Unsatisfied dependency expressed through method 'r2dbcMappingContext' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'r2dbcCustomConversions' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.r2dbc.convert.R2dbcCustomConversions]: Factory method 'r2dbcCustomConversions' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'connectionFactory' defined in class path resource [com/example/config/DatabaseConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [io.r2dbc.mssql.MssqlConnectionFactory] from ClassLoader [sun.misc.Launcher$AppClassLoader@764c12b6]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:798) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:228) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1358) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1204) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:882) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:66) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at com.example.app.R2Dbc3Application.main(R2Dbc3Application.java:13) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_212]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_212]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_212]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_212]


    @Autowired
    private ConnectionFactory connectionFactory;

    @Bean
    public DatabaseClient databaseClient() {
        return create(connectionFactory);
    }

server.port=
spring.r2dbc.url=r2dbc:mssql:/<host>/<db-name>
spring.r2dbc.username=
spring.r2dbc.password=
spring.r2dbc.initialization-mode=always
spring.main.web-application-type=reactive