没有合格的 bean，使用 Spring Data JPA 设置 2 个数据源

Question

I am trying to set up a second data source for my project. This is the spring-context.xml:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd

        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="PERSISTENCECLASSES"/>

    <!-- ************ JPA configuration *********** -->
    <tx:annotation-driven transaction-manager="transactionManager" />
    <bean id="firstTransactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="firstEntityManagerFactory" />
    </bean>
    <bean id="secondTransactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="secondEntityManagerFactory" />
    </bean>
    <bean id="firstEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceXmlLocation" value="classpath:/persistence.xml" />
        <property name="persistenceUnitName" value="second" />
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan" value="DOMAINCLASSES" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true" />
                <property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect" />
            </bean>
        </property>
    </bean>
    <bean id="secondEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml" />
        <property name="persistenceUnitName" value="second" />
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan" value="DOMAIN CLASSES" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true" />
                <property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect" />
            </bean>
        </property>
    </bean>

    <bean id="userRepositoryImpl" class="PERSISTENCECLASSES.UserRepostoryImpl"/>

    <bean id="first" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName" value="java:comp/env/jdbc/first" />
        <property name="resourceRef" value="true" />
    </bean>
    <bean id="second" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName" value="java:comp/env/jdbc/second" />
        <property name="resourceRef" value="true" />
    </bean>
</beans>

My userRepo looks the following way:

public interface UserRepository extends JpaRepository<User, String>, UserRepositoryCustom {
    Optional<User> findUserByEMail(String eMail);
    Optional<User> findUserByUserName(String userName);
    Optional<User> findUserByUserNameOrEMail(String userName, String eMail);
}

public interface UserRepositoryCustom {}

public class UserRepositoryImpl extends QuerydslRepositorySupport implements UserRepositoryCustom {

    public UserRepositoryImpl() {
        super(User.class);
    }

    // Some QueryDSL methods
}

I am getting the following exception:

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'loadStartupData': Unsatisfied dependency expressed through field 'userRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'PERSISTENCECLASSES.UserRepository' 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.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1395)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
    at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:127)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
    ... 24 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'PERSISTENCECLASSES.UserRepository' 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:1213)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
    ... 42 more

The LoadStartupData class is a @Service that creates an instance of UserRepository with the following call:

@Autowired UserRepository userrepo;

My Spring App:

@Configuration
@EnableScheduling
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, DataSourceTransactionManagerAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
@EnableTransactionManagement
public class App {

    public static void main(String[] args) throws IOException, NoSuchAlgorithmException, InvalidKeyException, UnirestException {

        SpringApplication.run(App.class, args);

    }

}

Any idea how to fix it or even a hint on where that might be coming from is highly appreciated? I tried using @PersistenceContext, Qualifiers and other things. -nothing worked though.

Answer 1

It looks like there is a confusion with the actual usage of Spring DATA(case before introducing a second datasource), and in the new case which the actual repository has to be manual implemented to serve the actual crud operations.

There are actually 2 options :

i) Half of your posted attempt, in which you will have to manually implement the actual query calls for every operation you need so you cant really use the JPARepository offered by Spring DATA. In the actual impl Class , you will autowire the 2 datasources and provide the actual service calls.

In reality the impl class would look like below

public class UserRepositoryImpl extends QuerydslRepositorySupport implements UserRepository {


@PersistenceContext(name = "firstEntityManagerFactory")
EntityManager firstEntityManagerFactory;
@PersistenceContext(name = "secondEntityManagerFactory")
EntityManager secondEntityManagerFactory;


//manually implement all crud operations , insert, delete, update, fetchByQuery plus your interface methods

Optional<User> findUserByEMail(String eMail);
Optional<User> findUserByUserName(String userName);
Optional<User> findUserByUserNameOrEMail(String userName, String eMail);
}

And your Interface would look like :

public interface UserRepository extends UserRepositoryCustom {
    Optional<User> findUserByEMail(String eMail);
    Optional<User> findUserByUserName(String userName);
    Optional<User> findUserByUserNameOrEMail(String userName, String eMail);
}

Also some typos, as already mentioned, should be corrected in the spring-conf.xml.(remove unused bean definitions, map to the proper entity-packages)

ii) Check this repository which distinguish the datasource by each entity (if that suits your case)