InvalidDataAccessApiUsageException trying to find using JPA query with Enum value

Enum def -

public enum someAccountType {
	ACCOUNT_NUMBER("account_number"),
	CREDIT_CARD("credit_card");

	public final String v;

	someAccountType(String value) {
		this.v = value;
	}
}

@AllArgsConstructor
@Getter
@Entity
@Builder
@Setter
public class SomeDetail {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    @Enumerated(EnumType.STRING)
	@Column(name="accountType")
	private Enum.someAccountType accountType;
    ..
}

Repository -

@Repository
public interface SomeDetailRepository extends JpaRepository<SomeDetail, Long> {

    List<someDetail> findByEncryptedIfscAndEncryptedAccountNoAndAccountTypeAndIsValid(
			String encryptedIfsc, String encryptedAccountNo, String accountType, Boolean isValid);

Service call -

List<SomeDetail> someDetails = someDetailRepository.findByEncryptedIfscAndEncryptedAccountNoAndAccountTypeAndIsValid(
				ben.getEncryptedIfsc(), ben.getEncryptedAccountNo(), Enum.someAccountType.CREDIT_CARD.v, isValid);

Exception -

org.springframework.dao.InvalidDataAccessApiUsageException: Parameter value [credit_card] did not match expected type [Enum$someAccountType (n/a)]; nested exception is java.lang.IllegalArgumentException: Parameter value [credit_card] did not match expected type [Enum$someAccountType (n/a)]

Why is it throwing this exception? I have defined @Enumerated(EnumType.STRING) so it should expect string type stored in db.

When using Enum with JPA, you need to rely on the Enum object, not on its attribute.
For instance, I'll change your repository method like this:

@Repository
public interface SomeDetailRepository extends JpaRepository<SomeDetail, Long> {

    List<someDetail> findByEncryptedIfscAndEncryptedAccountNoAndAccountTypeAndIsValid(
            String encryptedIfsc, String encryptedAccountNo, Enum.someAccountType accountType, Boolean isValid);

And use the enum val directly:

List<SomeDetail> someDetails = someDetailRepository.findByEncryptedIfscAndEncryptedAccountNoAndAccountTypeAndIsValid(
                ben.getEncryptedIfsc(), ben.getEncryptedAccountNo(), Enum.someAccountType.CREDIT_CARD, isValid);

By the way, in Java, always name your class, enum ... with a capital letter someAccountType -> SomeAccountType

What means @Enumarated

@Enumerated lets you specify how Hibernate will store the value in DB. You have two options (from the javadoc):

• EnumType.ORDINAL: Persist enumerated type property or field as an integer
• EnumType.STRING: Persist enumerated type property or field as a string

But it doesn't change how you use it in your repository code, it is changing only how Hibernate will store it.