I have parametrised interface and parametrised class that implements this interface. Than I inject this class into 3 services and set typeParameterClass in @PostConstruct method. 2 classes return correct typeParameterClass, but other one returns typeParameterClass from another service and not the one that was setted in this class in @PostConstruct.
Like
ClassOneServiceImpl.getParameter() = ClassOne.class;
ClassTwoServiceImpl.getParameter() = ClassTwo.class;
ClassThreeServiceImpl.getParameter() = ClassOne.class;
I've added logging to initialisation, however I see that setted TypeParameterClass in setTypeParameterClass(Class clazz) is correct.
In local environment on jdk-17 Temurin the program is working fine.
Any suggestions why @PostCOnstruct not working as expected? Or may be the problem can occur in other places?
public interface PostgresDAO<T> {
void setTypeParameterClass(Class<T> clazz);
Entity findEntityById(Long id);
}
@Repository
@NoArgsConstructor
@Getter
public class PostgresDAOImpl<T> implements PostgresDAO<T> {
private Class<T> typeParameterClass
@PersistenceContext
private EntityManager em;
@Override
public void setTypeParameterClass(Class<T> clazz) {
this.typeParameterClass = clazz;
}
**** some code with EntityManager
}
And I have 3 services that are using PostgresDAOImpl with different parameter.
@Service
@RequiredArgsConstructor
public class ClassOneServiceImpl implements ClassOneService {
private final PostgresDAO<ParameterOne> dao;
@PostConstruct
public void enrichDao() {
dao.setTypeParameterClass(ParameterOne.class);
}
public Class getParameter() {
return dao.getTypeParameterClass();
}
***** some code
}
@Service
@RequiredArgsConstructor
public class ClassTwoServiceImpl implements ClassTwoService {
private final PostgresDAO<ParameterTwo> dao;
@PostConstruct
public void enrichDao() {
dao.setTypeParameterClass(ParameterTwo.class);
}
public Class getParameter() {
return dao.getTypeParameterClass();
}
***** some code
}
@Service
@RequiredArgsConstructor
public class ClassThreeServiceImpl implements ClassThreeService {
private final PostgresDAO<ParameterThree> dao;
@PostConstruct
public void enrichDao() {
dao.setTypeParameterClass(ParameterThree.class);
}
public Class getParameter() {
return dao.getTypeParameterClass();
}
***** some other code
}
javax.annotation dependency added
<!--need for postconstruct annotation in java 11 https://www.baeldung.com/spring-postconstruct-predestroy-->
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
<version>1.3.2</version>
</dependency>
Setup
- lombok 1.18.22
- spring-boot 2.7.0
openjdk version "11.0.4" 2019-07-16 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.4+11-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.4+11-LTS, mixed mode, sharing)
Answer code:
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class PostgresDAOConfig {
@Bean
public PostgresDAO<ParameterOne> deceptionDAO() {
PostgresDAOImpl<ParameterOne> result = new PostgresDAOImpl<>();
result.setParameterClass(ParameterOne.class);
return result;
}
@Bean
public PostgresDAO<ParameterTwo> deceptionDAO() {
PostgresDAOImpl<ParameterTwo> result = new PostgresDAOImpl<>();
result.setParameterClass(ParameterTwo.class);
return result;
}
@Bean
public PostgresDAO<ParameterThree> deceptionDAO() {
PostgresDAOImpl<ParameterThree> result = new PostgresDAOImpl<>();
result.setParameterClass(ParameterThree.class);
return result;
}
}
