How can i fix this Exception? -> Caused by: java.lang.IllegalArgumentException: Not a managed type: - spring

Question

i have got this Exception
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dumpController' defined in file [...\tech\backend\webapplication\com\controller\DumpController.class]: Unsatisfied dependency expressed through constructor parameter 0: Error creating bean with name 'dumpService' defined in file [...\tech\backend\webapplication\com\service\DumpService.class]: Unsatisfied dependency expressed through constructor parameter 0: Error creating bean with name 'dumpRepository' defined in tech.backend.webapplication.com.repo.DumpRepository defined in #EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Not a managed type: class tech.backend.webapplication.com.model.Dump
...
Caused by: java.lang.IllegalArgumentException: Not a managed type: class tech.backend.webapplication.com.model.Dump
...
Process finished with exit code 1
Here are my classes:
MainClass
package tech.backend.webapplication;
#SpringBootApplication
public class WebapplicationApplication {
public static void main(String[] args) {
SpringApplication.run(WebapplicationApplication.class, args);
}
}
ModelClass:
package tech.backend.webapplication.com.model;
#Getter
#Setter
#AllArgsConstructor
#NoArgsConstructor
#ToString
#Entity
public class Dump implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
private String email;
}
Repository:
package tech.backend.webapplication.com.repo;
#Repository
public interface DumpRepository extends JpaRepository<Dump, Long> {
void deleteDumpById(Long id);
Optional<Dump> findDumpById(Long id);
}
Service:
package tech.backend.webapplication.com.service;
#Service
#RequiredArgsConstructor
#Slf4j
#Transactional
public class DumpService {
private final DumpRepository dumpRepository;
public Dump addDump(Dump dump) {
dump.setName("Johannes");
dump.setEmail("Johannes#mail.com");
return dumpRepository.save(dump);
}
public List<Dump> getAllDumps() {
return dumpRepository.findAll();
}
public Dump getDumpById(Long id) {
return dumpRepository.findDumpById(id)
.orElseThrow(() -> new DumpNotFoundException("Dump by id " + id + "was not found"));
}
public Dump updateDump(Dump dump) {
return dumpRepository.save(dump);
}
public void deleteDump(Long id) {
dumpRepository.deleteDumpById(id);
}
}
Controller:
package tech.backend.webapplication.com.controller;
#RestController
#RequestMapping("/dump")
#RequiredArgsConstructor
#Slf4j
public class DumpController {
private final DumpService dumpService;
#GetMapping("/all")
public ResponseEntity<List<Dump>> getAllDumps() {
List<Dump> dumps = dumpService.getAllDumps();
return new ResponseEntity<>(dumps, HttpStatus.OK);
}
#GetMapping("/find/{id}")
public ResponseEntity<Dump> getDumpById(#PathVariable("id") Long id) {
Dump dump = dumpService.getDumpById(id);
return new ResponseEntity<>(dump, HttpStatus.OK);
}
#PostMapping("/add")
public ResponseEntity<Dump> addDump(#RequestBody Dump dump) {
Dump newDump = dumpService.addDump(dump);
return new ResponseEntity<>(newDump, HttpStatus.CREATED);
}
#PutMapping("/update")
public ResponseEntity<Dump> updateDump(#RequestBody Dump dump) {
Dump updatedDump = dumpService.updateDump(dump);
return new ResponseEntity<>(updatedDump, HttpStatus.CREATED);
}
#DeleteMapping("/delete/{id}")
public ResponseEntity<?> deleteDump(#PathVariable("id") Long id) {
dumpService.deleteDump(id);
return new ResponseEntity<>(HttpStatus.OK);
}
}
The packages are as follows:
java
tech.backend.application
com
controller
exception
model
repo
service
WebapplicationApplication (class)
ressources
Can somebody help me to fix this error?
I would appreciate that :)
Thanks
Every time I start the application, this exception is the output

Answer 1

Spring Boot's auto-configuration probably cannot find your entity Dump.
Add the #EntityScan annotation to your application class or a configuration class, for example:
package tech.backend.webapplication;
#SpringBootApplication
#EntityScan("tech.backend.webapplication.com.model")
public class WebapplicationApplication {
public static void main(String[] args) {
SpringApplication.run(WebapplicationApplication.class, args);
}
}

Answer 2

On multi-modules this issue can happen,you can do on your main class,
#SpringBootApplication
#ComponentScan(basePackages = {"tech.backend.webapplication.*"})
public class WebapplicationApplication {
public static void main(String[] args) {
SpringApplication.run(WebapplicationApplication.class, args);
}
}