一個外鍵一對多春季啓動JPA的Informix

Question

複合鍵這是Informix數據庫的當前結構：

Table: msg_body 
     id (PK) 
     kanal 
     sender 
     ... 

Table: msg_user 
     id (PK, FK) 
     empfaenger (PK) 
     datum 
     ... 

一個MSG_USER有一個或多個msg_bodies。

msg_body域類：

import javax.persistence.*; 
import java.io.Serializable; 
import java.sql.Timestamp; 

@Entity 
@Table(name="msg_body") 
public class MessageBody implements Serializable { 
    @Id 
    @Column(name="id") 
    private int mb_id; 
    @Column(name="kanal") 
    private String channel; 
    @Column(name="gueltig_von") 
    private Timestamp validFrom; 
    @Column(name="gueltig_bis") 
    private Timestamp validTo; 
    @Column(name="sender") 
    private String sender; 
    @Column(name="erstell_datum") 
    private Timestamp createDate; 
    @Column(name="prioritaet") 
    private int priority; 
    @Column(name="nachricht") 
    private String message; 
    @Column(name="info") 
    private String info; 
    @Column(name="gueltig") 
    private char valid; 

    @ManyToOne 
    private MessageUser messageUser; 

    //getter + setter 
} 

MSG_USER域類：

import java.io.Serializable; 
import java.sql.Timestamp; 
import java.util.HashSet; 
import java.util.Set; 
import javax.persistence.*; 

@Entity 
@Table(name="msg_user") 
public class MessageUser implements Serializable { 
    @EmbeddedId 
    UserId mu_id; 

    @MapsId("mb_id") 
    @JoinColumn(name = "mu_id", referencedColumnName = "id") 
    @OneToMany 
    private Set<MessageBody> msg_bodies = new HashSet<>(); 

    @Column(name = "datum") 
    private Timestamp receiverDate; 
    @Column(name = "versuch") 
    private Timestamp tryTime; 
    @Column(name = "versuch_anzahl") 
    private int tryAmount; 
    @Column(name = "status") 
    private int state; 
    @Column(name = "ip") 
    private char ip; 

    // getter + setter + hashcode + equals 
} 

複合鍵類：

import java.io.Serializable; 
import javax.persistence.*; 

@Embeddable 
public class UserId implements Serializable 
{ 
    @Column(name="id") 
    private int mb_id; 
    @Column(name="empfaenger") 
    private String receiver; 

    // getter + setter + hashcode + equals 
} 

應用類：

import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.EnableAutoConfiguration; 
import org.springframework.boot.context.web.SpringBootServletInitializer; 
import org.springframework.context.annotation.ComponentScan; 
import org.springframework.context.annotation.Configuration; 
import org.springframework.data.jpa.repository.config.EnableJpaRepositories; 

@Configuration 
@ComponentScan("at.company.badge_service") 
@EnableAutoConfiguration 
@EnableJpaRepositories(basePackages = {"at.company.badge_service.repository"}) 

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

的目標是運行該語句：

public interface BARepository extends JpaRepository<MessageBody, Long> 
{ 
    @Query("SELECT COUNT(mu.id) FROM MessageUser mu WHERE mu.receiver = :username") 
    Long countBA(@Param("username") String username); 
} 

application.properties文件：

spring.main.show-banner=false 
security.basic.enabled=false 
spring.thymeleaf.cache=false 

# JACKSON 
spring.jackson.mapper.default-view-inclusion=true 
#spring.jackson.deserialization.fail-on-unknown-properties=false 

security.user.name: username 
security.user.password: password 

spring.view.prefix: /WEB-INF/views/ 
spring.view.suffix: .jsp 

# DATABASE 
spring.jpa.database: INFORMIX 
spring.jpa.hibernate.ddl-auto: validate 
spring.jpa.properties.hibernate.default_batch_fetch_size: 100 
spring.datasource.jndi-name=jdbc/msgdb 

錯誤代碼NullPointerException異常：

2015-04-24 09:30:04,702 [RMI TCP Connection(3)-127.0.0.1] ERROR o.s.boot.SpringApplication - Application startup failed 
    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NullPointerException 
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1566) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE] 
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE] 
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE] 
     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE] 
     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE] 
     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE] 
     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE] 
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [na:1.7.0_02] 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [na:1.7.0_02] 
     at java.lang.Thread.run(Thread.java:722) [na:1.7.0_02] 
    Caused by: java.lang.NullPointerException: null 
    Apr 24, 2015 9:30:04 AM org.apache.catalina.core.ContainerBase addChildInternal 
     at org.hibernate.cfg.annotations.CollectionBinder.bindCollectionSecondPass(CollectionBinder.java:1460) ~[hibernate-core-4.3.7.Final.jar:4.3.7.Final] 
     at org.hibernate.cfg.annotations.CollectionBinder.bindOneToManySecondPass(CollectionBinder.java:864) ~[hibernate-core-4.3.7.Final.jar:4.3.7.Final] 
    Schwerwiegend: ContainerBase.addChild: start: 
     at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:779) ~[hibernate-core-4.3.7.Final.jar:4.3.7.Final] 
    org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/badge_service]] 
     at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:728) ~[hibernate-core-4.3.7.Final.jar:4.3.7.Final]at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) 
     at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1426) ~[hibernate-core-4.3.7.Final.jar:4.3.7.Final] 

     at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618) 
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1625) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE] 
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1562) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE] 
     at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565) 
     ... 58 common frames omitted 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
     at java.lang.Thread.run(Thread.java:722) 
    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NullPointerException 
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1566) 
     at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
     ... 40 more 
    Caused by: java.lang.NullPointerException 
     at org.hibernate.cfg.annotations.CollectionBinder.bindCollectionSecondPass(CollectionBinder.java:1460) 
     at org.hibernate.cfg.annotations.CollectionBinder.bindOneToManySecondPass(CollectionBinder.java:864) 
     at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60) 
     at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:343) 
     at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318) 
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1625) 
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1562) 
     ... 58 more 

    Apr 24, 2015 9:30:04 AM org.apache.tomcat.util.modeler.BaseModelMBean invoke 
    Schwerwiegend: Exception invoking method manageApp 
    java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/badge_service]] 
     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904) 
     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) 
     at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649) 
     at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618) 
     at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565) 
     at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553) 
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808) 
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667) 
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
     at java.lang.Thread.run(Thread.java:722) 

    Apr 24, 2015 9:30:04 AM org.apache.tomcat.util.modeler.BaseModelMBean invoke 
    Schwerwiegend: Exception invoking method createStandardContext 
    javax.management.RuntimeOperationsException: Exception invoking method manageApp 
     at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:309) 
     at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) 
     at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:791) 
     at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618) 
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
     at java.lang.Thread.run(Thread.java:722) 
    Caused by: java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/badge_service]] 
     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:601) 
     at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) 
     ... 31 more 

我試圖在網上找到一個解決方案，但他們沒有一個在我的情況下工作。尤其是組合鍵中的外鍵似乎是一個罕見的問題。 我很清楚，將代理鍵添加到msg_user-table會容易得多，但我必須解決這個問題，所以我會很高興如果有人能告訴我如何編寫域類的代碼正確的關係。 如果您需要更多信息，請不要猶豫，向他們索要！ 非常感謝提前！

Answer 1

過了一會兒，我發現自己的解決方案：

消息體domainclass：

import javax.persistence.*; 
import java.io.Serializable; 
import java.sql.Timestamp; 
import java.util.HashSet; 
import java.util.Set; 

@Entity 
@Table(name="msg_body") 
public class MessageBody implements Serializable 
{ 
    @Id 
    @Column(name="id") 
    private int msgb_id; 

    @Column(name="kanal", columnDefinition = "char") 
    private String channel; 

    @Column(name="gueltig_von") 
    private Timestamp validFrom; 

    @Column(name="gueltig_bis") 
    private Timestamp validTo; 

    @Column(name="sender") 
    private String sender; 

    @Column(name="erstell_datum") 
    private Timestamp createDate; 

    @Column(name="prioritaet") 
    private int priority; 

    @Column(name="nachricht") 
    private String message; 

    @Column(name="info", columnDefinition = "lvarchar") 
    private String info; 

    @Column(name="gueltig") 
    private char valid; 

    @OneToMany 
    @JoinColumn(name = "id") 
    private Set<MessageUser> message_users = new HashSet<>(); 

    // getter + setter 
} 

CompositeKey domainclass：

import java.io.Serializable; 
import javax.persistence.*; 

@Embeddable 
public class MessageUserPK implements Serializable 
{ 
    private int mb_id; 
    private String receiver; 

    // getter + setter + hashcode + equals 
} 

MessageUser domainclass：

import java.io.Serializable; 
import java.sql.Timestamp; 
import javax.persistence.*; 

@Entity 
@Table(name="msg_user") 
public class MessageUser implements Serializable 
{ 
    @EmbeddedId 
    @AttributeOverrides 
    ({ 
      @AttributeOverride(name = "mb_id", column = @Column(name = "id")), 
      @AttributeOverride(name = "receiver", column = @Column(name = "empfaenger")) 
    }) 
    MessageUserPK mu_id; 

    @Column(name = "datum") 
    private Timestamp receiverDate; 

    @Column(name = "versuch") 
    private Timestamp tryTime; 

    @Column(name = "versuch_anzahl") 
    private int tryAmount; 

    @Column(name = "status") 
    private int state; 

    @Column(name = "ip") 
    private char ip; 

    @ManyToOne 
    @MapsId("mb_id") 
    @JoinColumn(name = "id") 
    private MessageBody messageBody; 

    // getter + setter + hashcode + equals 
} 

這個關係在問題中是雙向的，但我把Collection放在MessageBody-Domainclass中。經過一些其他修復，如「AttributOverrides」，它的工作。希望我能幫助解決方案的另一個！