A member variable's hashCode() value is different
- by Jacques René Mesrine
There's a piece of code that looks like this. The problem is that during bootup, 2 initialization takes place. (1) Some method does a reflection on ForumRepository & performs a newInstance() purely to invoke #setCacheEngine. (2) Another method following that invokes #start(). I am noticing that the hashCode of the #cache member variable is different sometimes in some weird scenarios. Since only 1 piece of code invokes #setCacheEngine, how can the hashCode change during runtime (I am assuming that a different instance will have a different hashCode). Is there a bug here somewhere ?
public class ForumRepository implements Cacheable
{
private static CacheEngine cache;
private static ForumRepository instance;
public void setCacheEngine(CacheEngine engine) { cache = engine; }
public synchronized static void start()
{
instance = new ForumRepository();
}
public synchronized static void addForum( ... )
{
cache.add( .. );
System.out.println( cache.hashCode() );
// snipped
}
public synchronized static void getForum( ... )
{
... cache.get( .. );
System.out.println( cache.hashCode() );
// snipped
}
}
