Build fork to work with GRADLE. Run it ignoring the tests, since meta model generator is not properly configured:

gradlew clean build -Dorg.gradle.java.home=C:\R2DA\java\jdk-11.0.10 -x test

specification-with-projection

Support Projections with JpaSpecificationExecutor.findAll(Specification,Pageable) for Spring Data JPA

version 2.x.x for Spring Data JPA 2.x (Spring Boot 2.x)

version 1.x.x Spring Data JPA 1.x

How to use

• add dependency to pom

<!-- for Spring Data 2.x -->
<dependency>
    <groupId>th.co.geniustree.springdata.jpa</groupId>
    <artifactId>specification-with-projections</artifactId>
    <version>2.0.1</version>
</dependency>

<!-- for Spring Data 1.x -->
<dependency>
    <groupId>th.co.geniustree.springdata.jpa</groupId>
    <artifactId>specification-with-projections</artifactId>
    <version>1.0.6</version>
</dependency>

• add annotation @EnableJpaRepositories(repositoryBaseClass = JpaSpecificationExecutorWithProjectionImpl.class) on Application class (Spring Boot)
• create your repository and extends JpaSpecificationExecutorWithProjection

public interface DocumentRepository extends JpaRepository<Document,Integer>,JpaSpecificationExecutorWithProjection<Document,Integer> {
    /**
    * projection interface
    **/
    public static interface DocumentWithoutParent{
        Long getId();
        String getDescription();
        String getDocumentType();
        String getDocumentCategory();
        List<DocumentWithoutParent> getChild();
    }
}

• use it

      @Test
    public void specificationWithProjection() {
        Specifications<Document> where = Specifications.where(DocumentSpecs.idEq(1L));
        Page<DocumentRepository.DocumentWithoutParent> all = documentRepository.findAll(where, DocumentRepository.DocumentWithoutParent.class, new PageRequest(0,10));
        Assertions.assertThat(all).isNotEmpty();
    }

  • version 1.0.3 RELEASE add support for @NamedEntityGraph and AD-HOC entity graph (via JpaEntityGraph) http://docs.spring.io/spring-data/jpa/docs/1.10.4.RELEASE/reference/html/#jpa.entity-graph

JpaEntityGraph jpaEntityGraph = new JpaEntityGraph(
    "birth.sistRecvTm",
    EntityGraph.EntityGraphType.FETCH,
    new String[]{"sistRecvTm","birth","transfer","merger"}
  );
  BirthWithoutChild birth = birthRepository.findAll(createSpecBirth(searchData, type.toUpperCase()), BirthWithoutChild.class,jpaEntityGraph,pageable);