org.mockito.exceptions.base.MockitoException: Checked exception is invalid for this method - mockito

Question

I am trying to test service layer using junit5 with spring boot 2.6.2, and I want to test throwing exception if the account not found,
I wrote the below test method
#Test
void getUserAccountWithUserAccountNotFoundExceptionTest() {
/**
* TODO tried to to test it but getting this error
* Checked exception is invalid for this method
*/
when(this.systemUserRepository.findByEmailAddress(emailAddress)).thenThrow(UserAccountNotFoundException.class);
Assertions.assertThrows(UserAccountNotFoundException.class, ()->{
this.manageUserAccountService.getUserAccount(emailAddress);
});
}
snippet of the service Implementation
#Service
public class ManageUserAccountServiceImpl {
.............
#Override
public UserAccountDto getUserAccount(String emailAddress) throws UserAccountNotFoundException {
......
.......
}
..........
}
User Account not found exception class
public class UserAccountNotFoundException extends UserAccountException {
public UserAccountNotFoundException() {
super();
}
public UserAccountNotFoundException(int errorCode, String errorMessage) {
super(errorCode, errorMessage);
}
public UserAccountNotFoundException(Throwable cause, boolean enableSuppression, boolean writableStackTrace,
int errorCode, String errorMessage) {
super(cause, enableSuppression, writableStackTrace, errorCode, errorMessage);
}
public UserAccountNotFoundException(Throwable cause, int errorCode, String errorMessage) {
super(cause, errorCode, errorMessage);
}
}
User account exception class
public class UserAccountException extends Exception {
/**
*
*/
private static final long serialVersionUID = -591169136507677996L;
protected ErrorInfoDto errorInfoDto;
public UserAccountException() {
super();
}
public UserAccountException(Throwable cause, boolean enableSuppression,
boolean writableStackTrace,int errorCode, String errorMessage) {
this.errorInfoDto = formErrorInfoDto(errorCode, errorMessage);
}
public UserAccountException(int errorCode,String errorMessage) {
this.errorInfoDto = formErrorInfoDto(errorCode, errorMessage);
}
public UserAccountException(Throwable cause,int errorCode, String errorMessage) {
this.errorInfoDto = formErrorInfoDto(errorCode, errorMessage);
}
private ErrorInfoDto formErrorInfoDto(int errorCode, String errorMessage) {
ErrorInfoDto errorInfoDto = null;
errorInfoDto = new ErrorInfoDto();
errorInfoDto.setErrorCode(errorCode);
errorInfoDto.setErrorMessage(errorMessage);
return errorInfoDto;
}
public ErrorInfoDto getErrorInfoDto() {
return errorInfoDto;
}
}
Repository interface
public interface SystemUserRepository extends JpaRepository<SystemUser, Long> {
long countByEmailAddress(String emailAddress);
long countByMobileNo(String mobileNo);
Optional<SystemUser> findByEmailAddress(String emailAddress);
}

Answer 1

The Mockito exception says it alone - the line when(this.systemUserRepository.findByEmailAddress(emailAddress)).thenThrow(UserAccountNotFoundException.class); instructs Mockito to throw exception when systemUserRepository.findByEmailAddress(...) is called.
However, the posted code for SystemUserRepository does declare any checked exception on the method: Optional<SystemUser> findByEmailAddress(String emailAddress);
Note also that SystemUserRepository handles the case of user not found by giving an Optional.empty() and not by throwing an exception.