Reverse @OnToMany @JoinTable

mrBrown

Super-Moderator
Mitarbeiter
Entweder über ein Repository (sowas wie Project findByFile(File file)) oder die Beziehung bidirektional machen, ersteres ist aber meist der saubere Weg.
 

mrBrown

Super-Moderator
Mitarbeiter
Du nutzt doch Spring Data JPA?

Dann ist Project findByFile(File file); alles, was im Repository-Interface ergänzt werden muss.
 

Schuriko

Bekanntes Mitglied
Könntest du mir bitte erklären, warum Variante 1 besser ist wie Variante 2 und wie bei Variante 2 die Bidirektional Notation lauten müsste.
 

mrBrown

Super-Moderator
Mitarbeiter
Könntest du mir bitte erklären, warum Variante 1 besser ist wie Variante 2
Eine unidirektionale Beziehung ist nahezu immer einfacher zu modellieren und zu benutzen, weil du einfach nur eine Beziehung in eine Richtung hast, und nicht zwei Beziehungen, in zwei Richtungen.

und wie bei Variante 2 die Bidirektional Notation lauten müsste.
Ein @ManyToOne mit den Attributen des @OneToMany entsprechenden Attributen.
 

Schuriko

Bekanntes Mitglied
Wenn ich
Java:
public interface ProjectRepository extends CrudRepository<Project, Long> {
   
    Project findByFile(File file);
   
}

erhalte ich beim compilieren folgende Fehlermeldung
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'projectService': Unsatisfied dependency expressed through field 'projectRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'projectRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.abado.pts.entities.Project com.abado.pts.repositories.ProjectRepository.findByFile(com.abado.pts.entities.File)! No property file found for type Project! Did you mean 'files'?
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at com.abado.pts.ProjectToolSuiteApplication.main(ProjectToolSuiteApplication.java:10) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_191]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_191]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_191]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_191]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.1.1.RELEASE.jar:2.1.1.RELEASE]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'projectRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.abado.pts.entities.Project com.abado.pts.repositories.ProjectRepository.findByFile(com.abado.pts.entities.File)! No property file found for type Project! Did you mean 'files'?
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1745) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1237) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1164) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
... 24 common frames omitted
Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract com.abado.pts.entities.Project com.abado.pts.repositories.ProjectRepository.findByFile(com.abado.pts.entities.File)! No property file found for type Project! Did you mean 'files'?
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:82) ~[spring-data-jpa-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:103) ~[spring-data-jpa-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:208) ~[spring-data-jpa-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:79) ~[spring-data-jpa-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lookupQuery(RepositoryFactorySupport.java:566) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery$1(RepositoryFactorySupport.java:559) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) ~[na:1.8.0_191]
at java.util.Iterator.forEachRemaining(Unknown Source) ~[na:1.8.0_191]
at java.util.Collections$UnmodifiableCollection$1.forEachRemaining(Unknown Source) ~[na:1.8.0_191]
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_191]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.mapMethodsToQuery(RepositoryFactorySupport.java:561) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new$0(RepositoryFactorySupport.java:551) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at java.util.Optional.map(Unknown Source) ~[na:1.8.0_191]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:551) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:324) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:297) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.util.Lazy.getNullable(Lazy.java:211) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.util.Lazy.get(Lazy.java:94) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:300) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:119) ~[spring-data-jpa-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
... 34 common frames omitted
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property file found for type Project! Did you mean 'files'?
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:94) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:382) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:358) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.mapping.PropertyPath.lambda$from$0(PropertyPath.java:311) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at java.util.concurrent.ConcurrentMap.computeIfAbsent(Unknown Source) ~[na:1.8.0_191]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:293) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:276) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.query.parser.Part.<init>(Part.java:81) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new$0(PartTree.java:250) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) ~[na:1.8.0_191]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_191]
at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:251) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.query.parser.PartTree$Predicate.lambda$new$0(PartTree.java:380) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) ~[na:1.8.0_191]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_191]
at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_191]
at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:381) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:96) ~[spring-data-commons-2.1.3.RELEASE.jar:2.1.3.RELEASE]
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:76) ~[spring-data-jpa-2.1.3.RELEASE.jar:2.1.3.RELEASE]
... 60 common frames omitted
 

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