问@OneToOne或@ManyToOne引用springboot中来自不同应用程序和数据库的实体的未知实体

EN

@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table(schema = "app1")
public class Flight implements Serializable {
    @Id
    @GeneratedValue(
            strategy = GenerationType.SEQUENCE,
            generator = "flight_sequence"
    )
    @SequenceGenerator(
            name = "flight_sequence",
            allocationSize = 1
    )
    @Column(nullable = false, updatable = false)
    private Long id;

    private String callsign;
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="aircraft_id", nullable=false)
    private Aircraft aircraft;
    private Date date;
    private Operator operator;
    private String origin;
    private String destination;
}

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(schema = "app2")
public class Aircraft implements Serializable {
    @Id
    @GeneratedValue(
            strategy = GenerationType.SEQUENCE,
            generator = "aircraft_sequence"
    )
    @SequenceGenerator(
            name = "aircraft_sequence",
            allocationSize = 1
    )
    @Column(nullable = false, updatable = false)
    private Long id;
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="operator_id", nullable=false)
    private Operator operator;
    private String registration;
    private String acType;
}

public interface FlightRepository extends JpaRepository<Flight, Long> {
    Flight findFirstByDestinationAndAircraftRegistrationOrderByDateDesc(String destination, String registration);
}

Caused by: org.hibernate.AnnotationException: @OneToOne or @ManyToOne on com.student.application.domain.app1.Flight.aircraft references an unknown entity: com.student.application.domain.app2.Aircraft
    at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:100)
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processEndOfQueue(InFlightMetadataCollectorImpl.java:1750)
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processFkSecondPassesInOrder(InFlightMetadataCollectorImpl.java:1694)
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1623)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:295)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1460)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1494)
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58)
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396)
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800)
    ... 86 more

@Configuration
@PropertySource({"classpath:application.properties"})
@EnableJpaRepositories(
        basePackages = "com.student.application.repository.app1",
        entityManagerFactoryRef = "app1EntityManager",
        transactionManagerRef = "app1TransactionManager")
public class App1DBConfiguration {
    @Autowired
    private Environment env;

    @Primary
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource app1DataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    @Primary
    public LocalContainerEntityManagerFactoryBean app1EntityManager() {
        LocalContainerEntityManagerFactoryBean em
                = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(app1DataSource());
        em.setPackagesToScan(
                "com.student.application.domain.app1");

        HibernateJpaVendorAdapter vendorAdapter
                = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);
        HashMap<String, Object> properties = new HashMap<>();
        properties.put("hibernate.hbm2ddl.auto",
                env.getProperty("spring.jpa.hibernate.ddl-auto"));
        properties.put("hibernate.dialect",
                env.getProperty("spring.jpa.properties.hibernate.dialect"));
        properties.put("hibernate.dialect.storage_engine",
                env.getProperty("spring.jpa.properties.hibernate.dialect.storage_engine"));
        em.setJpaPropertyMap(properties);

        return em;
    }

    @Primary
    @Bean
    public PlatformTransactionManager app1TransactionManager() {
        JpaTransactionManager transactionManager
                = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(
                app1EntityManager().getObject());
        return transactionManager;
    }
}

@Configuration
@PropertySource({"classpath:application.properties"})
@EnableJpaRepositories(
        basePackages = "com.student.application.repository.app2",
        entityManagerFactoryRef = "app2EntityManager",
        transactionManagerRef = "app2TransactionManager")
public class App2DBConfiguration {
    @Autowired
    private Environment env;

    @Bean
    @ConfigurationProperties(prefix = "spring.app2")
    public DataSource app2DataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean app2EntityManager() {
        LocalContainerEntityManagerFactoryBean em
                = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(app2DataSource());
        em.setPackagesToScan(
                "com.student.application.domain.app2");

        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);
        HashMap<String, Object> properties = new HashMap<>();
        properties.put("hibernate.hbm2ddl.auto",
                "none");
        properties.put("hibernate.implicit_naming_strategy", "org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy");
        properties.put("hibernate.physical_naming_strategy", "org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy");
        em.setJpaPropertyMap(properties);

        return em;
    }

    @Bean
    public PlatformTransactionManager app2TransactionManager() {
        JpaTransactionManager transactionManager
                = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(
                app2EntityManager().getObject());
        return transactionManager;
    }
}