[FIXED] How to make constructor called after autowired?

Issue

I am initializing a load cache in the constructor which needs autowired parameters. But due to spring bean sequence, I can' t get it right. So userLdapGroupsCache is created without setting timeout and size. Do you guys have any suggestion to fix this? Thanks.

  private LoadingCache<String, Set<String>> userLdapGroupsCache;

  @Autowired
  @Qualifier("cacheExpireTime")
  private int cacheExpireTime;

  @Autowired
  @Qualifier("cacheMaxSize")
  private int cacheMaxSize;

 public LdapAuthorization ()
  {
    userLdapGroupsCache = 
    CacheBuilder.newBuilder()
     .maximumSize(cacheMaxSize)
     .expireAfterWrite(cacheExpireTime, TimeUnit.MINUTES)
     .build(new CacheLoader<String, Set<String>>() {
              @Override
              public Set<String> load(String key) throws Exception {
                return getGroups(key);
              }
            });
  }

Solution

You have to put the initialization of that object inside a method annotated with @PostConstruct:

  @PostConstruct
  public void init()
  {
    userLdapGroupsCache = 
    CacheBuilder.newBuilder()
     .maximumSize(cacheMaxSize)
     .expireAfterWrite(cacheExpireTime, TimeUnit.MINUTES)
     ...
  }

Thanks to that it will be initialized with injected parameters as methods annotated with @PostConstruct are invoked after all of the fields have been injected into the bean.

Answered By - Maciej Kowalski