Getting empty contents in the Postman API when filtering through Spring data Specification - spring

Question

I'm using the Spring Data JPA Specifications for Filtering data.
But When i'm hitting this URL http://localhost:9091/api/student/all?salary_like=1500
if i'm filtering through name also getting empty contents.
i'm getting the empty contents here.
But in eclipse console it's generating the correct query:
Hibernate: select student0_.id as id1_0_, student0_.address as address2_0_, student0_.age as age3_0_, student0_.name as name4_0_, student0_.salary as salary5_0_ from student_data_with_projection student0_ where (student0_.name like ?) and (student0_.age like ?) and (student0_.address like ?) and student0_.salary=1500.0 limit ?
And My code is:
POJO
#Data
#Component
#NoArgsConstructor
#AllArgsConstructor
#Entity
#Setter
#Getter
#Table(name = "student_data_with_projection")
public class Student {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "name")
private String name;
#Column(name = "age")
private int age;
#Column(name = "salary")
private Float salary;
#Column(name = "address")
private String address;
}
Controller
#RestController
#RequestMapping(path = "api/student/") //This is a Base URL in Our Controller.
public class StudentController {
#Autowired
StudentRepository studentRepository;
#GetMapping(path = "all")
public #ResponseBody
Iterable<Student> getAllStudentWIthProjection(#RequestParam(required = false, defaultValue = "") String name_like,
#RequestParam(required = false, defaultValue = "") int age_like,
#RequestParam(required = false) Float salary_like,
#RequestParam(required = false, defaultValue = "") String address_like,
#RequestParam(required = false, defaultValue = "0") int pageNum,
#RequestParam(required = false, defaultValue = "20") int pageSize) {
StudentSpecification spec1 =
new StudentSpecification(new SearchCriteria("name", ":", name_like));
StudentSpecification spec2 =
new StudentSpecification(new SearchCriteria("age", ":", age_like));
StudentSpecification spec3 =
new StudentSpecification(new SearchCriteria("address", ":", address_like));
Specification<Student> specGroup = Specification.where(spec1).and(spec2).and(spec3);
if (salary_like != null) {
StudentSpecification spec4 =
new StudentSpecification(new SearchCriteria("salary", ":", salary_like));
specGroup = specGroup.and(spec4);
}
Page<Student> findAll = studentRepository.findAll(specGroup, PageRequest.of(pageNum, pageSize));
return findAll;
}
}
Repository
public interface StudentRepository extends PagingAndSortingRepository<Student, Long>, JpaSpecificationExecutor<Student> {
}
Specification
#AllArgsConstructor
public class StudentSpecification implements Specification<Student> {
private SearchCriteria criteria;
public StudentSpecification(SearchCriteria searchCriteria) {
super();
this.criteria=searchCriteria;
}
public SearchCriteria getCriteria() {
return criteria;
}
#Override
public Predicate toPredicate
(Root<Student> root, CriteriaQuery<?> query, CriteriaBuilder builder) {
if (criteria.getOperation().equalsIgnoreCase(">")) {
if (root.get(criteria.getKey()).getJavaType() == Date.class) {
return builder.greaterThanOrEqualTo(root.<Date>get(criteria.getKey()), (Date)criteria.getValue());
} else {
return builder.greaterThanOrEqualTo(
root.<String> get(criteria.getKey()), criteria.getValue().toString());
}
}
else if (criteria.getOperation().equalsIgnoreCase("<")) {
if (root.get(criteria.getKey()).getJavaType() == Date.class) {
return builder.lessThanOrEqualTo(root.<Date>get(criteria.getKey()), (Date)criteria.getValue());
} else {
return builder.lessThanOrEqualTo(
root.<String> get(criteria.getKey()), criteria.getValue().toString());
}
}
else if (criteria.getOperation().equalsIgnoreCase(":")) {
if (root.get(criteria.getKey()).getJavaType() == String.class) {
return builder.like(
root.<String>get(criteria.getKey()), "%" + criteria.getValue() + "%");
} else {
return builder.equal(root.get(criteria.getKey()), criteria.getValue());
}
}
return null;
}
}
Criteria
#Data
#AllArgsConstructor
public class SearchCriteria {
private String key;
private String operation;
private Object value;
public SearchCriteria(String key, String operation, Object value) {
super();
this.key = key;
this.operation = operation;
this.value = value;
}
/* Getter and Setter */
}
I have uploaded the code in GitHub: https://github.com/avinashm294/Filters.git
How can i fix this to filter my data.

Answer 1

I had used the #Getter and #Setter annotation of lombok in the POJO which was not working. After Adding the getter and setter explicitly now it's working.

Answer 2

the like in the query work as =
you need to append % before and after the name
example
StudentSpecification spec1 =
new StudentSpecification(new SearchCriteria("name", ":", "%"+name_like+"%"));