JPA Criteria Builder를 사용하여 두 테이블을 조인하는 방법은 무엇입니까?

나는 school이라는 SQL 테이블과 student라는 테이블을 가지고있다. 모든 학교에는 신분증이 있으며, 모든 학생에게는 소속 된 학교의 신분증 인 "학교 신분증"이 있습니다. 이제 "John"이라는 학생이있는 모든 학교를 찾고 싶습니다.JPA Criteria Builder를 사용하여 두 테이블을 조인하는 방법은 무엇입니까?

schoolDao.findAll(new mySpecification("John"));

나는 것을 사용해야합니다 :

SELECT * FROM school 
INNER JOIN student 
    on student.school_id = school.id 
where student.name = "John"

그러나, 내가 (예처럼 사용) 내 쿼리를 만들기 위해 봄 부팅 사양을 사용할 수 있습니다 SQL 구문 뭔가 같은 것 이미 사양이 있으므로 그냥 새로 추가하려고합니다.

schoolDao.findAll(
    (Specification) Specifications.where(new oldSpecification(), new mySpecification("John"));

어떻게 할 수 있습니까?

나는

public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query, CriteriaBuilder cb) { 
    if (this.filterTag == "") { 
     return null; 
    } 
    Class clazz = query.getResultType(); 
    if (clazz.equals(Long.class) || clazz.equals(long.class)) { 
     return null; 
    } 
    Join<School,Student> tags = root.join("student", JoinType.LEFT); 

    return cb.equal(tags.get("name"), "John"); 
}

을 시도했지만 작동하지 않습니다. 누구든지 도울 수 있니?

편집 : 학생 클래스

@Entity 
@Table(name = "student") 
public class School implements Serializable { 

    private static final long serialVersionUID = 1L; 

    @ManyToOne 
    private Long schoolId; 

    private String name; 

    public Long getSchoolId() { 
     return schoolId; 
    } 

    public void setSchoolId(Long schoolId) { 
     this.schoolId = schoolId; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 
}

및 학교 클래스 :

@Entity 
@Table(name = "school") 
public class School implements Serializable { 

    private static final long serialVersionUID = 1L; 

    //other fields 

    @OneToMany(targetEntity = Student.class, mappedBy = "schoolId") 
    @Transient 
    private List<Student> students = new ArrayList<Student>(); 

    //all getters and setters 
}

편집 2 :

오류가

java.lang.IllegalArgumentException: Unable to locate Attribute with the the given name [student] on this ManagedType [School] 
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:384) ~[spring-orm-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:227) ~[spring-orm-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:417) ~[spring-orm-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59) ~[spring-tx-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213) ~[spring-tx-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147) ~[spring-tx-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:131) ~[spring-data-jpa-1.9.1.RELEASE.jar!/:na] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) ~[spring-aop-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at com.sun.proxy.$Proxy113.findAll(Unknown Source) ~[na:na] 
    at com.visenze.evaluation.service.SearchExperimentService.getSearchExperiments(SearchExperimentService.java:132) ~[classes!/:na] 
    at com.visenze.evaluation.service.SearchExperimentService$$FastClassBySpringCGLIB$$30203a2c.invoke(<generated>) ~[classes!/:na] 
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:650) ~[spring-aop-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at com.visenze.evaluation.service.SearchExperimentService$$EnhancerBySpringCGLIB$$2cf73334.getSearchExperiments(<generated>) ~[classes!/:na] 
    at com.visenze.evaluation.controller.SearchExperimentController.getSearchExperiments(SearchExperimentController.java:126) ~[classes!/:na] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_92] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_92] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_92] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_92] 
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) [spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) [spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) [spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:242) [spring-boot-actuator-1.3.0.RELEASE.jar!/:1.3.0.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:111) [spring-boot-actuator-1.3.0.RELEASE.jar!/:1.3.0.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:169) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:48) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:158) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:53) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176) [spring-security-web-4.0.3.RELEASE.jar!/:4.0.3.RELEASE] 
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:87) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:103) [spring-boot-actuator-1.3.0.RELEASE.jar!/:1.3.0.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_92] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_92] 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.0.28.jar!/:8.0.28] 
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_92] 
Caused by: java.lang.IllegalArgumentException: Unable to locate Attribute with the the given name [ExperimentTag] on this ManagedType [com.visenze.evaluation.model.base.IdEntity] 
    at org.hibernate.jpa.internal.metamodel.AbstractManagedType.checkNotNull(AbstractManagedType.java:144) ~[hibernate-entitymanager-4.3.11.Final.jar!/:4.3.11.Final] 
    at org.hibernate.jpa.internal.metamodel.AbstractManagedType.getAttribute(AbstractManagedType.java:130) ~[hibernate-entitymanager-4.3.11.Final.jar!/:4.3.11.Final] 
    at org.hibernate.jpa.internal.metamodel.AbstractManagedType.getAttribute(AbstractManagedType.java:128) ~[hibernate-entitymanager-4.3.11.Final.jar!/:4.3.11.Final] 
    at org.hibernate.jpa.internal.metamodel.AbstractManagedType.getAttribute(AbstractManagedType.java:128) ~[hibernate-entitymanager-4.3.11.Final.jar!/:4.3.11.Final] 
    at org.hibernate.jpa.criteria.path.AbstractFromImpl.locateAttributeInternal(AbstractFromImpl.java:133) ~[hibernate-entitymanager-4.3.11.Final.jar!/:4.3.11.Final] 
    at org.hibernate.jpa.criteria.path.AbstractPathImpl.locateAttribute(AbstractPathImpl.java:221) ~[hibernate-entitymanager-4.3.11.Final.jar!/:4.3.11.Final] 
    at org.hibernate.jpa.criteria.path.AbstractFromImpl.join(AbstractFromImpl.java:419) ~[hibernate-entitymanager-4.3.11.Final.jar!/:4.3.11.Final] 
    at org.hibernate.jpa.criteria.path.AbstractFromImpl.join(AbstractFromImpl.java:405) ~[hibernate-entitymanager-4.3.11.Final.jar!/:4.3.11.Final] 
    at com.visenze.evaluation.dao.jpa.TagFilterSpecification.toPredicate(TagFilterSpecification.java:39) ~[classes!/:na] 
    at org.springframework.data.jpa.domain.Specifications$ComposedSpecification.toPredicate(Specifications.java:189) ~[spring-data-jpa-1.9.1.RELEASE.jar!/:na] 
    at org.springframework.data.jpa.domain.Specifications.toPredicate(Specifications.java:99) ~[spring-data-jpa-1.9.1.RELEASE.jar!/:na] 
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.applySpecificationToCriteria(SimpleJpaRepository.java:583) ~[spring-data-jpa-1.9.1.RELEASE.jar!/:na] 
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.getQuery(SimpleJpaRepository.java:534) ~[spring-data-jpa-1.9.1.RELEASE.jar!/:na] 
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.getQuery(SimpleJpaRepository.java:519) ~[spring-data-jpa-1.9.1.RELEASE.jar!/:na] 
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:401) ~[spring-data-jpa-1.9.1.RELEASE.jar!/:na] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_92] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_92] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_92] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_92] 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:483) ~[spring-data-commons-1.11.1.RELEASE.jar!/:na] 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:468) ~[spring-data-commons-1.11.1.RELEASE.jar!/:na] 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:440) ~[spring-data-commons-1.11.1.RELEASE.jar!/:na] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) ~[spring-data-commons-1.11.1.RELEASE.jar!/:na] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) ~[spring-tx-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) ~[spring-tx-4.2.3.RELEASE.jar!/:4.2.3.RELEASE] 
    ... 111 common frames omitted

감사

출처

2016-07-07 Nicolas Ding

엔티티 클래스를 표시하십시오. 이런 조인은 일반적으로 처리됩니다. – chrylis

나는 학생과 학교 수업을 추가했다. –

예외의 전체 스택 추적을 제공 할 수 있습니까? –

이것은 내가 그것을

EntityManager em = emf.createEntityManager(); 
    CriteriaBuilder cb = em.getCriteriaBuilder(); 
    CriteriaQuery<Object> cq = cb.createQuery(); 
    Root<Item> ri = cq.from(School.class); 

    // joins 
    Join<Object, Object> h = ri.join("Student"); 
    Query query = em.createQuery(cq); 
    List<Object[]> result = query.getResultList();

을하지만 어떻게 당신이 당신의 엔티티 설정, 단지 JPA를 사용하지 가지고?

출처

2016-07-07 04:33:28

안녕하세요! 우선, 귀하의 답변에 감사 드리며, 나는 지금 당장 그들을 시도 할 것입니다. 귀하의 질문에 대답하기 위해 문제는 코드가 실제로 더 복잡하고 누군가가 이미 사양을 사용하고 있다는 것입니다. JPA와 사양을 혼합하는 방법을 찾지 못했습니다. –

왜 h를 사용하지 않습니까? 그 이름이 존이라면 어디에서 시험할까요? –

죄송합니다. 내 코드에서'h'가'group by'을 추가하는 데 사용되었습니다. –

JPA Criteria Builder를 사용하여 두 테이블을 조인하는 방법은 무엇입니까?

답변

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