Heroku shows Whitelabel Error Page but not on localhost - spring

Question

I have a Spring boot application with PostgreSQL. The app run very well on localhost with all the data from the PostgreSQL. I have successful upload the app to Heroku and migrated the database to Heroku PostgreSQL. The problem is when I click some of the links that retrieve data from PostgreSQL shows a White Error page. But on localhost every thing works fine.
Below is the Controller that link to the White Error Page.
#Controller
public class MahubiriController {
#Autowired
private MisaleRepository misaleRepository;
#GetMapping("/masomo/somolaleo")
public String masomoAngalia(Model model){
model.addAttribute("masomoYote", misaleRepository.findAllOrderByDateDesc() );
return "masomo";
} }
Below is the repository
#Repository
#Transactional
public interface MisaleRepository extends JpaRepository <Misale, String> {
#Query(value ="SELECT * FROM misale ORDER BY date DESC" , nativeQuery = true)
public List<Misale> findAllOrderByDateDesc();
}
Below is the Entity for the particular object
#Entity
#Table(name = "misale")
public class Misale {
#Id
#Column(name ="date")
private String date;
#Lob
#Column(name ="first_reading", columnDefinition="text")
private String firstReading;
#Lob
#Column(name ="second_reading", columnDefinition="text")
private String secondReading;
// Constructors, getter and setters
}
Below is the Query used to create the particular table on Postgresql
CREATE TABLE misale(date VARCHAR(20) NOT NULL PRIMARY KEY,
first_reading TEXT NOT NULL,
second_reading TEXT,gospel TEXT NOT NULL);
What could possibly be wrong on Heroku to lead to a White Error Page and not on a local host.
Update :
After implementing the Exception handling as suggested by # krishnkant jaiswal, I receive message "Unable to access lob str…le to access lob stream" as below.
timestamp "2021-04-03T01:26:43.791+00:00"
message "Unable to access lob stream; nested exception is org.hibernate.HibernateException: Unable to access lob stream"
details "uri=/masomo/somolaleo"

Answer 1

With the help of Exception handling and a long research, On my side it shows that you cannot use
#Lob and #Column(columnDefinition="text")
So I had to remove #Lob and leave #Column(columnDefinition="text")
#Column(columnDefinition="text")
Now I cloud retrieve the data from PostgreSQL without error.
Hope it might help someone else in future.