I have the following code:
public interface PolicyDetailsService {
public void display();
}
Following are the implementations
@Service("PolicyDetailsServiceImpl")
public class PolicyDetailsServiceImpl implements PolicyDetailsService {
@Override
public void display() {
System.out.println("PolicyDetailsServiceImpl displayed");
}
}
public class PreneedPolicyDetailsServiceImpl implements PolicyDetailsService {
@Override
public void display() {
System.out.println("PreneedPolicyDetailsServiceImpl displayed");
}
}
public class PreneedTrustPolicyDetailsServiceImpl implements PolicyDetailsService {
@Override
public void display() {
System.out.println("PreneedTrustPolicyDetailsServiceImpl displayed");
}
}
I am creating the objects by creating beans like the following,
@Bean(name = { "AGENCY-PLI", "AGENCY-PMM" })
public PolicyDetailsServiceImpl getPolicyDetailsServiceImpl(
@Autowired PolicyDetailsServiceImpl policyDetailsServiceImpl) {
return policyDetailsServiceImpl;
}
@Bean(name = { "AFS-AFS", "AFS-PMM" })
public PreneedPolicyDetailsServiceImpl getPreneedPolicyDetailsServiceImpl() {
return new PreneedPolicyDetailsServiceImpl();
}
@Bean({ "AFS-PMT" })
public PreneedTrustPolicyDetailsServiceImpl getPreneedTrustPolicyDetailsServiceImpl() {
return new PreneedTrustPolicyDetailsServiceImpl();
}
The controller where i am using the services,
@Autowired
Map<String, PolicyDetailsService> policyDetails;
@GetMapping("/display/{displayName}")
public String display(@PathVariable String displayName) {
try {
policyDetails.get(displayName).display();
}catch(Exception e) {
e.printStackTrace();
}
return "Display Succesfull";
}
What i want to acheive: If I pass either "AGENCY-PLI" or "AGENCY-PMM" in the REST service call, the map should return PolicyDetailsServiceImpl object. It is currently working for "AGENCY-PLI". On passing "AGENCY-PMM" i am getting NullPointerException as the map is not returing any object. My understanding is, the "AGENCY-PLI" is acting as a primary name and the other names are aliases. So if i used it like the following,
@Autowired
@Qualifier("AGENCY-PMM")
private PolicyDetailsService policyDetailsService;
I would get the correct object reference. So, my question: Is there a way i can get the object from the map on passing aliases.
Actually I think the solution can be done without holding a map. Here is a possible solution you can try.
@Autowired
ApplicationContext applicationContext;
@GetMapping("/display/{displayName}")
public String display(@PathVariable String displayName) {
try {
PolicyDetailsService service = applicationContext.getBean(displayName, PolicyDetailsService.class);
service.display();
}catch(Exception e) {
e.printStackTrace();
}
return "Display Succesfull";
}
In addition, I am wondering why you create a PolicyDetailsServiceImpl
bean using @Service
and another using @Bean
, is it a typo? In case you would like to create one Singleton, I think you better remove the @Service
in PolicyDetailsServiceImpl
and add the name in @Bean(name=xxx)
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