verify the cache entry is constructed (#99)

Author: reugn

src/main/java/com/aerospike/mapper/tools/ClassCache.java

@@ -56,7 +56,7 @@ public <T> ClassCacheEntry<T> loadClass(@NotNull Class<T> clazz, IBaseAeroMapper
         }
 
         ClassCacheEntry<T> entry = (ClassCacheEntry<T>) cacheMap.get(clazz);
-        if (entry == null) {
+        if (entry == null || entry.isNotConstructed()) {
             synchronized (lock) {
                 entry = (ClassCacheEntry<T>) cacheMap.get(clazz);
                 if (entry == null) {
@@ -85,6 +85,9 @@ public <T> ClassCacheEntry<T> loadClass(@NotNull Class<T> clazz, IBaseAeroMapper
                     } catch (IllegalArgumentException iae) {
                         cacheMap.remove(clazz);
                         return null;
+                    } catch (Exception e) {
+                        cacheMap.remove(clazz);
+                        throw e;
                     }
                 }
             }

src/main/java/com/aerospike/mapper/tools/ClassCacheEntry.java

@@ -101,6 +101,7 @@ private enum FactoryMethodType {
     private String shortenedClassName;
     private boolean isChildClass = false;
 
+    private volatile boolean constructed;
 
     // package visibility only.
     ClassCacheEntry(@NotNull Class<T> clazz, IBaseAeroMapper mapper, ClassConfig config,
@@ -160,9 +161,14 @@ public ClassCacheEntry<T> construct() {
         ClassCache.getInstance().setStoredName(this, this.shortenedClassName);
 
         this.checkRecordSettingsAgainstSuperClasses();
+        constructed = true;
         return this;
     }
 
+    public boolean isNotConstructed() {
+        return !constructed;
+    }
+
     public Policy getReadPolicy() {
         return readPolicy;
     }