Spring data jpa repository findBy returning null even if data present in DB - spring

Question

I am using spring data JPA, facing issue as result is always coming NULL even if record present into DB.
I tried debugging spring code and checked whether statement created correctly or not. Statement is created correctly and parameter is also populated correctly.
Configuration: -
Spring-boot = 2.0.5.RELEASE
Oracle DB = Oracle Database 11g Release 11.2.0.2.0 - 64bit
POM
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<exclusions>
<exclusion>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jdbc</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc7</artifactId>
<version>12.1.0</version>
</dependency>
</dependencies>
Entity class:
#Entity()
public class User {
#Id
#GeneratedValue(strategy=GenerationType.SEQUENCE, generator = "user_Sequence")
#SequenceGenerator(name = "user_Sequence", sequenceName = "USER_SEQ")
private Long id;
#Column(unique=true)
private String userName;
private String password;
//getter & setter
Repository class
#Repository
public interface UserRepository extends
org.springframework.data.repository.CrudRepository<User, Long>{
User findByUserName(String userName);
User save(User user);
}
Service class
#Service("loginService")
public class LoginService implements ILoginService {
#Autowired
UserRepository userRepository;
#Override
public boolean isValidUser(String userName, String password) {
User user = userRepository.findByUserName(userName);
if(user != null && user.getUserName().equals(userName) && user.equals(password)){
return true;
} else {
return false;
}
}
}
Debug Screenshot : -
Debug Screenshot parameter value is "admin" and SQL formed
SQL Formed : -
select user0_."id" as id1_2_, user0_."password" as password2_2_, user0_."user_name" as user_name3_2_ from "user" user0_ where user0_."user_name"=?
If I run same query in DB, result is : -
Result Screenshot

Answer 1

Since you are not using your column name as your field names it needs to know what to map to in your entity.
Change your field to either be user_name or change:
#Column(unique=true)
private String userName;
to
#Column(name="user_name", unique=true)
private String userName;
thus it will be able to know what column it references;
https://www.concretepage.com/spring-5/spring-data-crudrepository-example

Answer 2

use findByNameEqualsAndStatus in Repository

Answer 3

Below are things that work for me. I am using Oracle 19C with org.hibernate.dialect.Oracle12cDialect.
grant all on <schema>.<table> to <user>;
grant all on <schema>.<sequence> to <user>;