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How to inject appllication,properties value based on field availability?

By : gtomoe
Date : September 15 2020, 01:00 PM
will be helpful for those in need I think the real question is what do you do with that ApplicationPropertyHandler?
One possible solution is to not use values at all, it wasn't presented among answers so I add it here.
code :

public class Main {
   public static void main(String [] args){...}

public class MyConfigurationProperties {

   public static class Http {
       private int port = 8080; // getters/setters, 0 is a default

   public static class Https {
       private int port = 0; // getters/setters, 0 is a default


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Using @Qualifier based on @Inject field CDI

By : Georff
Date : March 29 2020, 07:55 AM
this one helps. I'm having trouble with CDI conditional injection to use a kind of Strategy in EJB's injections. , Try this...
code :
public class someManagedBean {

    private BeanInterface myEJB;

@Target({ElementType.FIELD, ElementType.METHOD})
public @interface MyOwnQualifier {
    SomeCondition condition();

public class BeanInterfaceFactory {

    SomeBean someBean

    public BeanInterface getBeanInterfaceEJBImpl() {
        if(someBean.getCondition()) {         
            return new BeanInterfaceEJBImpl();
        } else {

public enum RoleCondition {
    ADMIN("ADMIN User");

Is it possible to inject different repository classes based on application.properties?

By : Wai Yan Linn Htet
Date : March 29 2020, 07:55 AM
help you fix your problem I assume both repositories have a common interface where you want to load the actual bean. I'd try something like this: (I didn't test it)
code :
MongoRepository mongoRepository;
CrudRepository crudRepository;

boolean isMongo;

private Repository actualRepository;

  public void init() {
    actualRepository = isMongo ? mongoRepository : crudRepository;
public Repository actualRepository(@Value("isMongo") boolean isMongo, MongoRepository mongoRepository, CrudRepository crudRepository) {
  isMongo ? mongoRepository : crudRepository;

Spring - Inject Dependency based on properties

By : Mayank goyal
Date : March 29 2020, 07:55 AM
wish help you to fix your issue If you really only need a single bean, then create a conditional configuration
code :
@ConditionalOnProperty(name = "fileStore.class", havingValue="FileStoreA")
public class FileStoreAConfiguration {
    public IFileStore fileStore() {
        return new FileStoreA(...);

@ConditionalOnProperty(name = "fileStore.class", havingValue="FileStoreB")
public class FileStoreBConfiguration {
    public IFileStore fileStore() {
        return new FileStoreB(...);

Spring, inject properties in a Bean instance based one of that Bean's field value, is it possible?

By : Antonio
Date : March 29 2020, 07:55 AM
should help you out Are you using just spring or also spring-boot?
What about injecting org.springframework.core.env.Environment to your pojo and configuring it with it.
code :
public class ServiceConfig {

    private String url;
    private String endpoint;
    private String serviceName;

    public ServiceConfig(String serviceName, Environment env) {
        // TODO assert on serviceName not empty 
        this.serviceName = serviceName;
        this.url = env.getProperty(serviceName.concat(".url");
        this.endpoint = env.getProperty(serviceName.concat(".endpoint"); 
public class ServiceConfig {

    private String url;
    private String endpoint;

    // getters setters
public class ServicesConfiguration {

    ServiceConfig service1(){
        return new ServiceConfig();

    ServiceConfig service2(){
        return new ServiceConfig();

Getters/properties availability based on object's state (based on parsing state, for example)

By : conduitOf
Date : March 29 2020, 07:55 AM
it should still fix some issue One option: have the parse() method return the parse result (instead of storing it in the parser's state). That result could be an abstract class with two concrete subclasses: one for success (with getter(s) for the relevant result info) and one for failure (with getter(s) for the failure reason).
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