我無法一起使用彈簧數據jpa預測和規格。我有以下設置 -如何使用彈簧數據jpa的投影和規格?
實體 -
@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();
}
國家規範 -
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);
}
};
}
}
庫 -
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
}
前兩種方法findByName和findAllProjectedBy工作正常。 而第三方法findAllProjectedBy(規格說明書)拋出以下異常 -
所致:java.util.NoSuchElementException:在 的java.util.ArrayList $ Itr.next(ArrayList.java:854)空〜 [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]在 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]在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]在 org.springframework.transaction.interceptor.TransactionInterceptor $ 1.proceedWithInvocation(TransactionInterceptor.java:99) 〜[彈簧-TX-4.3.5.RELEASE.jar:4.3.5。 org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) 〜[spring-tx-4.3.5.RELEASE.jar:4.3.5.RELEASE] at org.springframework.transaction在 .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.ExposeInvocationIn terrier.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.RELEAS E] ... 11個普通幀 省略
這怎麼能實現?有任何想法嗎?