如何在弹簧数据jpa中使用投影和规格? [英] How to use projections and specifications with spring data jpa?

问题描述

我无法同时使用Spring Data JPA预测和规范.我有以下设置:

I'm not able to use Spring Data JPA projections and specifications together. I have the following setup:

实体:

@Entity
public class Country {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

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

    @Column(name = "CODE", nullable = false)
    private String code;

    ---getters & setters---

}

投影界面:

public interface CountryProjection {
    String getName();
}

国家/地区规格:

public class CountrySpecification {
    public static Specification<Country> predicateName(final String name) {
        return new Specification<Country>() {
            @Override
            public Predicate toPredicate(Root<Country> eventRoot, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
                return criteriaBuilder.equal(eventRoot.get(Country_.name), name);
            }
        };
    }
}

存储库:

public interface CountryRepository extends JpaRepository<Country, Long>, JpaSpecificationExecutor<Country> {
    List<CountryProjection> findByName(String name); // works fine
    List<CountryProjection> findAllProjectedBy(); // works fine
    List<CountryProjection> findAllProjectedBy(Specification<Country> specification); //throws Exception as shown below
}

前两个方法findByName和findAllProjectedBy可以正常工作. 而第三个方法findAllProjectedBy(Specification Specification)会引发以下异常-

The first two methods findByName and findAllProjectedBy works fine. Whereas the third method findAllProjectedBy(Specification specification) throws the following exception -

由以下原因引起:java.util.NoSuchElementException:在null java.util.ArrayList $ Itr.next(ArrayList.java:854)〜[na:1.8.0_102]在 java.util.Collections $ UnmodifiableCollection $ 1.next(Collections.java:1042) 〜[na:1.8.0_102]在 org.springframework.data.jpa.repository.query.CriteriaQueryParameterBinder.bind(CriteriaQueryParameterBinder.java:63) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.ParameterBinder.bind(ParameterBinder.java:100) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.ParameterBinder.bindAndPrepare(ParameterBinder.java:160) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.ParameterBinder.bindAndPrepare(ParameterBinder.java:151) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.PartTreeJpaQuery $ QueryPreparer.invokeBinding(PartTreeJpaQuery.java:218) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.PartTreeJpaQuery $ QueryPreparer.createQuery(PartTreeJpaQuery.java:142) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.PartTreeJpaQuery.doCreateQuery(PartTreeJpaQuery.java:78) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.AbstractJpaQuery.createQuery(AbstractJpaQuery.java:190) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.JpaQueryExecution $ CollectionExecution.doExecute(JpaQueryExecution.java:118) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:82) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:116) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:106) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.data.repository.core.support.RepositoryFactorySupport $ QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:482) 〜[spring-data-commons-1.12.6.RELEASE.jar:na]在 org.springframework.data.repository.core.support.RepositoryFactorySupport $ QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:460) 〜[spring-data-commons-1.12.6.RELEASE.jar:na]在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 〜[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) 〜[spring-data-commons-1.12.6.RELEASE.jar:na]在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 〜[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.transaction.interceptor.TransactionInterceptor $ 1.proceedWithInvocation(TransactionInterceptor.java:99) 〜[spring-tx-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) 〜[spring-tx-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) 〜[spring-tx-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 〜[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) 〜[spring-tx-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 〜[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor $ CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133) 〜[spring-data-jpa-1.10.6.RELEASE.jar:na]在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 〜[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) 〜[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 〜[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) 〜[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE]在 com.sun.proxy.$ Proxy82.findAllProjectedBy(未知来源)〜[na:na]位于 com.mmp.data.jpa.DataJpaApplication.run(DataJpaApplication.java:42) [classes/:na]位于 org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:800) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE] ... 11个常见框架 省略

Caused by: java.util.NoSuchElementException: null at java.util.ArrayList$Itr.next(ArrayList.java:854) ~[na:1.8.0_102] at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1042) ~[na:1.8.0_102] at org.springframework.data.jpa.repository.query.CriteriaQueryParameterBinder.bind(CriteriaQueryParameterBinder.java:63) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.ParameterBinder.bind(ParameterBinder.java:100) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.ParameterBinder.bindAndPrepare(ParameterBinder.java:160) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.ParameterBinder.bindAndPrepare(ParameterBinder.java:151) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.PartTreeJpaQuery$QueryPreparer.invokeBinding(PartTreeJpaQuery.java:218) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.PartTreeJpaQuery$QueryPreparer.createQuery(PartTreeJpaQuery.java:142) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.doCreateQuery(PartTreeJpaQuery.java:78) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.AbstractJpaQuery.createQuery(AbstractJpaQuery.java:190) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.JpaQueryExecution$CollectionExecution.doExecute(JpaQueryExecution.java:118) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:82) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:116) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:106) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:482) ~[spring-data-commons-1.12.6.RELEASE.jar:na] at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:460) ~[spring-data-commons-1.12.6.RELEASE.jar:na] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) ~[spring-data-commons-1.12.6.RELEASE.jar:na] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) ~[spring-tx-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) ~[spring-tx-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133) ~[spring-data-jpa-1.10.6.RELEASE.jar:na] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.5.RELEASE.jar:4.3.5.RELEASE] at com.sun.proxy.$Proxy82.findAllProjectedBy(Unknown Source) ~[na:na] at com.mmp.data.jpa.DataJpaApplication.run(DataJpaApplication.java:42) [classes/:na] at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:800) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE] ... 11 common frames omitted

如何实现?有什么想法吗?

How can this be achieved? Any ideas?

推荐答案

尚不支持混合使用投影"和规格".有一个错误对此进行跟踪.

The ability to mix Projections and Specifications are not yet supported. There is a bug tracking this.

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