使用外键保存复合主键

使用复合主键创建实体时出现问题，此键也是外键。这是我的表格和关系tables schematics 。当我想创建新闻实体时，我收到错误消息，并创建newsTranslation。 NewsTranslation具有引用新闻表的外键的复合主键。使用外键保存复合主键

这是我的代码：

NewsAggregate

@AggregateRoot 
@Entity 
@Table(name = "news") 
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) 
public class NewsAggregate extends AuditingAggregateRoot implements Serializable { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "news_id") 
    private Long newsId; 

    @ManyToOne 
    @JoinColumn(name = "id") 
    private UserAggregate authorId; 

    @Column(name = "publish_time") 
    private ZonedDateTime publishTime; 

    @Column(name = "published", nullable = false) 
    private boolean published = false; 

    @ManyToMany 
    @JoinTable(
     name = "tags_news", 
     joinColumns = {@JoinColumn(name = "news_id", referencedColumnName = "news_id")}, 
     inverseJoinColumns = {@JoinColumn(name = "tag", referencedColumnName = "tag")}) 
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) 
    private Set<Tags> tags = new HashSet<Tags>(); 

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, 
     orphanRemoval = true) 
    private List<NewsTranslation> newsTranslation; 



    public NewsAggregate(UserAggregate authorId, Set<Tags> tags, String langCode, 
         String title, String shortDescription, String longDescription) { 
     this.authorId = authorId; 
     this.tags = tags; 
     newsTranslation.add(
      new NewsTranslation(this, langCode, title, shortDescription, longDescription) 
     ); 


    } 

//Getters, equal, hashCode

NewsTranslation

@Entity 
@Table(name = "news_translation") 
/*@IdClass(NewsLangId.class)*/ 
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) 
public class NewsTranslation implements Serializable { 

    private static final long serialVersionUID = 7576921328990303444L; 

    @EmbeddedId 
    private NewsLangId newsLangId; 

    @Column(name = "title", length = TITLE_MAX_LENGTH, nullable = false) 
    private String title; 

    @Column(name = "short_description", length = SHORT_DESC_MAX_LENGTH, nullable = false) 
    private String shortDescription; 

    @Column(name = "long_description", nullable = false) 
    private String longDescription; 

    @ManyToOne 
    @JoinColumn(name = "news_id", insertable = false, updatable = false) 
    private NewsAggregate newsAggregate; 

    @ManyToOne 
    @JoinColumn(name = "lang_code", insertable = false, updatable = false) 
    private Languages languages; 

    public NewsTranslation() { 
    } 

    protected NewsTranslation(NewsAggregate newsAggregate, String langCode,String title, String shortDescription, String longDescription) { 
     System.out.println(">>>>>>>>>>>>>>>.. NewsTranslation constructor"); 
     this.title = title; 
     this.shortDescription = shortDescription; 
     this.longDescription = longDescription; 
     this.newsAggregate = newsAggregate; 
     this.languages = new Languages(); 
     this.newsLangId = new NewsLangId(this.newsAggregate.getId(), langCode); 
     System.out.println(">>>>>>>>> NewsTranslation : title = "+this.title+", shortDescription = "+this.shortDescription+ 
     ", longDescription = "+this.longDescription+", newsAggregate = "+this.newsAggregate +", languages = "+this.languages); 

    } 

// getters, setters

标签

@Entity 
@Table(name = "tags") 
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) 
public class Tags implements Serializable { 
private static final long serialVersionUID = 2995101252921266446L; 

@Id 
@Column(name = "tag", length = TAG_MAX_LENGTH, unique = true) 
private String tag; 

public Tags() { 
} 

private Tags(Builder builder) { 
    this.tag = Preconditions.checkNotNull(builder.tag); 
} 

public void setTag(String tag) { 
    this.tag = tag; 
}

NewsLangId

@Embeddable 
public class NewsLangId implements Serializable { 

private static final long serialVersionUID = -4822628791720244835L; 

@Column(name = "news_id") 
private long newsId; 
@Column(name = "lang_code") 
private String langCode; 

public NewsLangId() { 
} 

public NewsLangId(long newsId, String langCode) { 
    System.out.println("Create NewsLangId: "+newsId+", "+langCode); 
    this.newsId = newsId; 
    this.langCode = langCode; 
} 

// getters, setters, equal, hashcode

在NewsFactory我想创建NewsAggregate与NewsTranlation，但我有错误消息NullPointer。

新闻工厂

Set<Tags> tagsSet = new HashSet<Tags>(tagsRepository.findAll()); 
     UserAggregate login = userRepository.findOneByLogin("admin").get(); 


     NewsAggregate news = new NewsAggregate(login,tagsSet, createNewsDto.getLangCode(), createNewsDto.getTitle(), 
      createNewsDto.getShortDescription(),createNewsDto.getLongDescription()); 

     log.info(">>>>>>>>>>>> NewsFactory: newsAggregate = "+news); 

     return news;

错误：

java.lang.NullPointerException: null 
    at it.seiton.aexea.domain.model.news.NewsTranslation.<init>(NewsTranslation.java:55) 
    at it.seiton.aexea.domain.model.news.NewsAggregate.<init>(NewsAggregate.java:61) 
    at it.seiton.aexea.domain.model.news.NewsFactory.createNews(NewsFactory.java:55) 
    at it.seiton.aexea.domain.service.impl.NewsServiceDefault.createNews(NewsServiceDefault.java:29) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) 
    at com.sun.proxy.$Proxy184.createNews(Unknown Source) 
    at it.seiton.aexea.web.rest.NewsResource.createNews(NewsResource.java:43) 
    at it.seiton.aexea.web.rest.NewsResource$$FastClassBySpringC530334.invoke(<generated>) 
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) 
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 
    at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:85) 
    at it.seiton.aexea.aop.logging.LoggingAspect.logAround(LoggingAspect.java:51) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:620) 
    at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:609) 
    at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:68) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:59) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655) 
    at it.seiton.aexea.web.rest.NewsResource$$EnhancerBySpringCGLIB$$c9591bb7.createNews(<generated>) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:817) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:731) 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:968) 
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:870) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) 
    at com.codahale.metrics.servlet.AbstractInstrumentedFilter.doFilter(AbstractInstrumentedFilter.java:104) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at com.hazelcast.web.WebFilter.doFilter(WebFilter.java:360) 
    at io.undertow..core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:237) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:92) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:112) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:207) 
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176) 
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) 
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) 
    at org.springframework.web.filter.OncePerRequestFilter.doOncePerRequestFilter.java:107) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:87) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) 
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) 
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) 
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) 
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
    at io.undertow.security.handlers.AbstractConfiityHandler.handleRequest(AbstractConfidentialityHandler.java:46) 
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) 
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) 
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) 
    at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
    at io.undertow.servlet.handlers.SessionRestoringHandler.handleRequest(SessionRestoringHandler.java:119) 
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284) 
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263) 
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81) 
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174) 
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202) 
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at java.lang.Thread.run(Thread.java:745)

PS。对不起我的英语不好。

来源

2016-04-27 Michał Niedziela

你能粘贴你的标签实体吗？ – cralfaro

那么NewsTranslation中的第55行是什么？ –

@cralfaro我添加标签实体。 –

我通过更改生成的主键解决了我的问题。现在java生成id，而不是postgresql。

NewsAggregate

@AggregateRoot 
@Entity 
@Table(name = "news") 
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) 
public class NewsAggregate extends AuditingAggregateRoot implements Serializable { 
    private static final Logger log = LoggerFactory.getLogger(NewsAggregate.class); 


@Id 
@Column(name = "news_id") 
private String newsId; 

@ManyToOne 
@JoinColumn(name = "author_id", referencedColumnName = "id") 
private UserAggregate authorId; 

@Column(name = "publish_date") 
private ZonedDateTime publishTime = null; 

@ManyToMany(cascade = CascadeType.ALL) 
@JoinTable(
    name = "tags_news", 
    joinColumns = {@JoinColumn(name = "news_id", referencedColumnName = "news_id")}, 
    inverseJoinColumns = {@JoinColumn(name = "tag", referencedColumnName = "tag")}) 
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) 
private Set<Tags> tags = new HashSet<Tags>(); 

@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true) 
@JoinColumn(name = "news_id", referencedColumnName = "news_id") 
@Fetch(FetchMode.JOIN) 
private List<NewsTranslation> newsTranslation = new ArrayList<NewsTranslation>(); 

public NewsAggregate(Set<Tags> tags, UserAggregate authorId) { 
    this.newsId = generateId(authorId.getId()); 
    this.tags = tags; 
    this.authorId = authorId; 
    this.publishTime = ZonedDateTime.now(); 
} 

private NewsAggregate(Builder builder) { 
    this.authorId = Preconditions.checkNotNull(builder.authorId); 
    this.publishTime = builder.publishTime; 
    this.tags = Preconditions.checkNotNull(builder.tags); 
    this.newsTranslation = Preconditions.checkNotNull(builder.newsTranslation); 
} 

private String generateId(long userId) { 
    return ZonedDateTime.now().toInstant().toEpochMilli() + "_" + userId; 
} 

public static NewsAggregate createNews(Set<Tags> tags, UserAggregate authorId, CreateNewsDto createNewsDto) { 

    NewsAggregate news = new NewsAggregate(tags, authorId); 
    log.info(">>>>>>>>>>>>>>>>>> news_id = "+news.getNewsId()); 
    NewsLangId newsLangId = new NewsLangId(news.getNewsId(), "en"); 

    NewsTranslation newsTranslation = new NewsTranslation(newsLangId, createNewsDto.getTitle(), 
     createNewsDto.getShortDescription(), createNewsDto.getLongDescription()); 

    List<NewsTranslation> newsTranslations = new ArrayList<>(); 
    newsTranslations.add(newsTranslation); 

    news.addTranslation(newsTranslations); 
    return news; 
} 

private void addTranslation(List<NewsTranslation> newsTranslations) { 
    this.newsTranslation = newsTranslations; 
}

感谢所有为有趣。我希望这将是有益的。

来源

2016-04-28 21:38:25

使用外键保存复合主键

回答

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