java - Spring Data，多个数据源，不是托管类型异常

标签 java spring postgresql spring-boot netsuite

我一直在尝试让多个数据库系统在同一个 spring boot 项目中工作的时间比预期的要长。我一直遇到以下异常，需要更多的目光来插入我进行修复。

对于下面的代码量，我深表歉意，但是由于我不确定问题实际发生在哪里，所以我将其全部列在下面。

请注意:我使用专有 ERP 的数据库作为端点之一。此端点是一个 Oracle 数据库，并且是只读的。如果需要，我们可以将其切换到 MySQL 端点，但是我的用例需要 ERP 的端点才能使项目成功。

使用的资源:

我确定我的答案可能仍然存在于上述之一中，但是我现在离问题太近了，这是我需要帮助的地方。

异常(exception):

java.lang.IllegalArgumentException: Not a managed type: class com.xxx.ddbo.suiteanalytics.objects.ReturnsReasonBrand

代码:

application.properties

    #Global properties for spring configuration
    logging.level.org.apache=ERROR      
    logging.level.org.springframework=WARN
    logging.level.org.hibernate=INFO        
    logging.level.org.hibernate.type=INFO

    #Spring configuration
    spring.jpa.show-sql=true
    spring.jackson.property-naming-strategy=CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES
    spring.jpa.hibernate.naming.strategy=org.hibernate.cfg.ImprovedNamingStrategy
    spring.jpa.properties.hibernate.show_sql=false
    spring.jpa.properties.hibernate.use_sql_comments=true
    spring.jpa.properties.hibernate.format_sql=true
    spring.jpa.properties.hibernate.type=info
    spring.jpa.generate-ddl=false
    spring.jpa.database=default


    ## DATABASE CONFIGURATIONS

    #Properties for PostgreSQL connection
    spring.postgresql.datasource.url=xxxxxxxx
    spring.postgresql.datasource.username=xxxxxxxx
    spring.postgresql.datasource.password=xxxxxxxx
    spring.postgresql.datasource.driver-class-name=org.postgresql.Driver
    spring.postgresql.datasource.tomcat.max-active=50

    #Properties for NetSuite SuiteAnalytics ODBC connection
    #Sandbox URL
    spring.suiteanalytics.datasource.url=xxxxxxxx
    #Production URL
    #spring.suiteanalytics.datasource.url=xxxxxxxx
    spring.suiteanalytics.datasource.username=xxxxxxxx
    spring.suiteanalytics.datasource.password=xxxxxxxx
    spring.suiteanalytics.datasource.driver-class-name=com.netsuite.jdbc.openaccess.OpenAccessDriver
    spring.suiteanalytics.datasource.tomcat.max-active=50

DdboApplication.java (ddbo)

    @EnableJpaRepositories
    @SpringBootApplication
    @ComponentScan("com.xxx.ddbo")
    public class DdboApplication implements CommandLineRunner{

        @Autowired
        private ReturnReasonsBrandRepository rrRepo;
        @Autowired
        private CustomListValuesRepository customListValuesRepository;

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

        @Override
        public void run(String... args) throws Exception {

            CustomSegments cs = new CustomSegments(rrRepo);
            cs.printReturnReasonBrand();

            CustomLists cl = new CustomLists(customListValuesRepository);
            cl.printCustomListValues();
        }
    }

PostgresqlConfig.java (ddbo.postgresql.configuration)

    @Configuration
    @EnableJpaRepositories(
            basePackages = "com.xxx.ddbo.postgresql.interfaces",
            entityManagerFactoryRef = "entityManagerFactory",
            transactionManagerRef = "transactionManager"
    )
    public class PostgresqlConfig {


        @Primary
        @Bean(name = "dataSource")
        @ConfigurationProperties(prefix="spring.postgresql")
        public DataSource dataSource() {
            return DataSourceBuilder.create().build();
        }

        @Primary
        @Bean(name = "entityManagerFactory")
        public LocalContainerEntityManagerFactoryBean entityManagerFactory(
                EntityManagerFactoryBuilder builder,
                @Qualifier("dataSource") DataSource dataSource) {

            HashMap<String, Object> properties = new HashMap<>();
            properties.put("hibernate.dialect", "org.hibernate.dialect.PostgreSQLDialect");

            return builder
                    .dataSource(dataSource)
                    .properties(properties)
                    .packages("com.xxx.ddbo.postgresql.interfaces")
                    .persistenceUnit("foo")
                    .build();
        }

        @Primary
        @Bean(name = "transactionManager")
        public PlatformTransactionManager transactionManager(
                @Qualifier("entityManagerFactory") EntityManagerFactory entityManagerFactory) {
            return new JpaTransactionManager(entityManagerFactory);
        }
    }

CustomListValuesRepository.java (ddbo.postgresql.interfaces)

    @Repository
    public interface CustomListValuesRepository extends JpaRepository<CustomListValues,CustomListValuePkey>{
    }

CustomLists.java (ddbo.postgresql.logic)

    @Component
    public class CustomLists {

        private final CustomListValuesRepository customListValuesRepository;

        @Autowired
        public CustomLists(CustomListValuesRepository customListValuesRepository) {
            this.customListValuesRepository = customListValuesRepository;
        }

        public void printCustomListValues(){
            List<CustomListValues> values = customListValuesRepository.findAll();
            for(CustomListValues value: values){
                System.out.println(value.getValueText());
            }
        }
    }

CustomLists.java (ddbo.postgresql.objects)
    @Entity
    @Table(name = "custom_lists")
    public class CustomLists {

        @Id
        @Column
        private String listIntId;

        @Column
        private String mongoId;

        public CustomLists(String listIntId) {
            this.listIntId = listIntId;
        }

        public CustomLists() {
        }

        public String getListIntId() {
            return listIntId;
        }

        public void setListIntId(String listIntId) {
            this.listIntId = listIntId;
        }

        public String getMongoId() {
            return mongoId;
        }

        public void setMongoId(String mongoId) {
            this.mongoId = mongoId;
        }

    }   

CustomListValuePkey (ddbo.postgresql.objects)
    @Embeddable
    public class CustomListValuePkey implements Serializable {

        @Column
        private String listId;
        @Column
        private String valueIntId;

        public String getListId() {
            return listId;
        }

        public void setListId(String listId) {
            this.listId = listId;
        }

        public String getValueIntId() {
            return valueIntId;
        }

        public void setValueIntId(String valueIntId) {
            this.valueIntId = valueIntId;
        }
    }

CustomListValues.java (ddbo.postgresql.objects)
    @Entity
    @Table(name = "custom_list_values")
    public class CustomListValues implements Serializable {

        @EmbeddedId
        private CustomListValuePkey pkey;

        @Column
        private String valueText;

        @ManyToOne
        @JoinColumn(name = "listIntId")
        private CustomLists listId;


        public CustomLists getListId() {
            return listId;
        }

        public void setListId(CustomLists listId) {
            this.listId = listId;
        }

        public String getValueText() {
            return valueText;
        }

        public void setValueText(String valueText) {
            this.valueText = valueText;
        }

        public CustomListValuePkey getPkey() {
            return pkey;
        }

        public void setPkey(CustomListValuePkey pkey) {
            this.pkey = pkey;
        }
    }

SuiteAnalyticsConfig.java (ddbp.suiteanalytics.configuration)
    @Configuration
    @PropertySource({"classpath:application.properties"})
    @EnableJpaRepositories(
            basePackages = "com.xxx.ddbo.suiteanalytics.interfaces",
            entityManagerFactoryRef = "suiteanalyticsEntityManagerFactory",
            transactionManagerRef = "suiteanalyticsTransactionManager"
    )
    public class SuiteAnalyticsConfig {

        @Bean(name = "nsDataSource")
        @ConfigurationProperties(prefix="spring.suiteanalytics")
        public DataSource nsDataSource() {
            return DataSourceBuilder.create().build();
        }

        @Bean(name = "nsEntityManagerFactory")
        public LocalContainerEntityManagerFactoryBean nsEntityManagerFactory(
                EntityManagerFactoryBuilder builder,
                @Qualifier("nsDataSource") DataSource nsDataSource) {

            HashMap<String, Object> properties = new HashMap<>();
            properties.put("hibernate.dialect", "org.hibernate.dialect.Oracle10gDialect");

            return builder
                    .dataSource(nsDataSource)
                    .properties(properties)
                    .packages("com.xxx.ddbo.suiteanalytics.interfaces")
                    .persistenceUnit("ReturnReasonsBrand")
                    .build();
        }

        @Bean(name = "nsTransactionManager")
        public PlatformTransactionManager nsTransactionManager(
                @Qualifier("nsEntityManagerFactory") EntityManagerFactory nsEntityManagerFactory) {
            return new JpaTransactionManager(nsEntityManagerFactory);
        }
    }

ReturnReasonsBrandRepository.java (ddbo.suiteanalytics.interfaces)
    @Repository
    public interface ReturnReasonsBrandRepository extends JpaRepository<ReturnsReasonBrand,Integer> {
        // ReturnsReasonBrand findOneByRrBrandId(Integer id);
    }

CustomSegments.java (ddbo.suiteanalytics.logic)
    @Component
    public class CustomSegments {

        private final ReturnReasonsBrandRepository rrRepo;

        @Autowired
        public CustomSegments(ReturnReasonsBrandRepository rrRepo) {
            this.rrRepo = rrRepo;
        }

        public void printReturnReasonBrand(){
            List<ReturnsReasonBrand> brand = rrRepo.findAll();
            for(ReturnsReasonBrand rrBrand : brand){
                System.out.println(rrBrand.getRrBrandName());
            }
        }
    }

ReturnReasonsBrand.java (ddbo.suiteanalytics.objects)
    @Entity
    @Table(name = "rr_brand")
    public class ReturnsReasonBrand {

        @Id
        @Column(name = "RR_BRAND_ID")
        private Integer rrBrandId;
        @Column(name = "RR_BRAND_NAME")
        private String rrBrandName;

        public Integer getRrBrandId() {
            return rrBrandId;
        }

        public void setRrBrandId(Integer rrBrandId) {
            this.rrBrandId = rrBrandId;
        }

        public String getRrBrandName() {
            return rrBrandName;
        }

        public void setRrBrandName(String rrBrandName) {
            this.rrBrandName = rrBrandName;
        }
    }

完整的堆栈跟踪:

   2018-03-14 09:53:17.773  INFO 14512 --- [           main] com.xxx.ddbo.DdboApplication             : Starting DdboApplication on xxx with PID xxx (started by roberth in xxx)
2018-03-14 09:53:17.775  INFO 14512 --- [           main] com.xxx.ddbo.DdboApplication             : No active profile set, falling back to default profiles: default
2018-03-14 09:53:18.740  INFO 14512 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
    name: CustomListValues
    ...]
2018-03-14 09:53:18.808  INFO 14512 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.0.12.Final}
2018-03-14 09:53:18.809  INFO 14512 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2018-03-14 09:53:18.810  INFO 14512 --- [           main] org.hibernate.cfg.Environment            : HHH000021: Bytecode provider name : javassist
2018-03-14 09:53:18.848  INFO 14512 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2018-03-14 09:53:19.130  INFO 14512 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect
2018-03-14 09:53:19.365  INFO 14512 --- [           main] o.h.e.j.e.i.LobCreatorBuilderImpl        : HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
2018-03-14 09:53:19.366  INFO 14512 --- [           main] org.hibernate.type.BasicTypeRegistry     : HHH000270: Type registration [java.util.UUID] overrides previous : org.hibernate.type.UUIDBinaryType@3249a1ce
2018-03-14 09:53:19.503  WARN 14512 --- [           main] org.hibernate.mapping.RootClass          : HHH000038: Composite-id class does not override equals(): com.xxx.ddbo.postgresql.objects.CustomListValuePkey
2018-03-14 09:53:19.503  WARN 14512 --- [           main] org.hibernate.mapping.RootClass          : HHH000039: Composite-id class does not override hashCode(): com.xxx.ddbo.postgresql.objects.CustomListValuePkey
2018-03-14 09:53:19.698  INFO 14512 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
    name: ReturnReasonsBrand
    ...]
2018-03-14 09:53:35.120  INFO 14512 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.Oracle10gDialect
2018-03-14 09:53:36.268  INFO 14512 --- [           main] o.h.e.j.e.i.LobCreatorBuilderImpl        : HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4
2018-03-14 09:53:36.434  WARN 14512 --- [           main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'ddboApplication': Unsatisfied dependency expressed through field 'rrRepo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'returnReasonsBrandRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.xxx.ddbo.suiteanalytics.objects.ReturnsReasonBrand
2018-03-14 09:53:41.730 ERROR 14512 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'ddboApplication': Unsatisfied dependency expressed through field 'rrRepo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'returnReasonsBrandRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.xxx.ddbo.suiteanalytics.objects.ReturnsReasonBrand
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at com.xxx.ddbo.DdboApplication.main(DdboApplication.java:26) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'returnReasonsBrandRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.xxx.ddbo.suiteanalytics.objects.ReturnsReasonBrand
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    ... 18 common frames omitted
Caused by: java.lang.IllegalArgumentException: Not a managed type: class com.xxx.ddbo.suiteanalytics.objects.ReturnsReasonBrand
    at org.hibernate.jpa.internal.metamodel.MetamodelImpl.managedType(MetamodelImpl.java:210) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
    at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:70) ~[spring-data-jpa-1.11.10.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getEntityInformation(JpaEntityInformationSupport.java:68) ~[spring-data-jpa-1.11.10.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:173) ~[spring-data-jpa-1.11.10.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:106) ~[spring-data-jpa-1.11.10.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:88) ~[spring-data-jpa-1.11.10.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:198) ~[spring-data-commons-1.13.10.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:277) ~[spring-data-commons-1.13.10.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:263) ~[spring-data-commons-1.13.10.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:101) ~[spring-data-jpa-1.11.10.RELEASE.jar:na]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    ... 28 common frames omitted

最佳答案

entityManagerFactory -> packages 应该指向您的托管实体的包。这里你指向的是 com.xxx.ddbo.suiteanalytics.interfaces 而不是 com.xxx.ddbo.suiteanalytics.objects 包含了所有要被实体管理的实体经理。在 SuiteAnalyticsConfig 中更新 nsEntityManagerFactory 中的包名称。

return builder
              .dataSource(dataSource)
              .properties(properties)
              .packages("com.xxx.ddbo.suiteanalytics.objects")
              .persistenceUnit("foo")
              .build();

确保您还将 PostgresqlConfig 中的 entityManagerFactory 的包名称更新为 ddbo.postgresql.objects package

根据配置文件，数据源的配置属性也应该有数据源，例如

@ConfigurationProperties(prefix="spring.postgresql.datasource")

从 DdboApplication 中删除 @EnableJpaRepositories。

需要修复包结构或更新 ComponentScan 以查找 spring 组件。

Here是一个展示此操作的 repo 协议(protocol)。

关于java - Spring Data，多个数据源，不是托管类型异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49265309/

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