Wie zwei Tabellen mithilfe von JPA Criteria Builder verbunden werden?

Ich habe eine SQL-Tabelle namens Schule, und eine andere heißt Student. Jede Schule hat einen Ausweis, und jeder Schüler hat einen "Schulausweis", dh die ID der Schule, der er angehört. Jetzt möchte ich alle Schulen finden, in denen es einen Studenten namens "John" gibt. Die SQL-Syntax wäre so etwas wie: Wie zwei Tabellen mithilfe von JPA Criteria Builder verbunden werden?

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

Ich habe jedoch den Frühling Boot Specification verwenden, um meine Query (dh verwenden Sie es mögen) zu machen:

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

Ich habe zu verwenden, dass weil es bereits eine Spezifikation und ich möchte nur ein neues oben drauf hinzuzufügen:

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

So, wie ich das tun kann?

Ich versuchte

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"); 
}

aber es funktioniert nicht. Jeder kann helfen?

EDIT: Die Klasse Student

@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; 
    } 
}

und die Schulklasse:

@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 
}

EDIT 2:

Der Fehler ist

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

Dank

0 Diese

Quelle

2016-07-07 Nicolas Ding

Zeigen Sie Ihre Entitätsklassen an. Joins wie diese werden normalerweise für Sie behandelt. – chrylis

Ich habe den Schüler und die Schulklasse hinzugefügt. –

können Sie eine vollständige Stapelverfolgung der Ausnahme angeben? –

ist, wie ich es

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();

Aber wie Sie haben Ihre Einheiten Setup, die einfach nicht JPA verwenden?

Quelle

2016-07-07 04:33:28

Hallo! Vor allem, danke für deine Antwort, ich werde sie jetzt ausprobieren. Zur Beantwortung Ihrer Frage besteht das Problem darin, dass der Code in Wirklichkeit komplexer ist und jemand bereits eine Spezifikation verwendet hat. Ich konnte einen Weg nicht finden, JPA und Spezifikation zu mischen –

Warum benutzen Sie nicht h? Und wo testest du, ob der Name John ist? –

Entschuldigung, in meinem Code wurde 'h' verwendet, um eine' Gruppe von' hinzuzufügen. –

Wie zwei Tabellen mithilfe von JPA Criteria Builder verbunden werden?

Antwort

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