diff --git a/src/main/java/org/folio/edge/patron/cache/PatronIdCache.java b/src/main/java/org/folio/edge/patron/cache/PatronIdCache.java
index 465da42..13bc25a 100644
--- a/src/main/java/org/folio/edge/patron/cache/PatronIdCache.java
+++ b/src/main/java/org/folio/edge/patron/cache/PatronIdCache.java
@@ -26,16 +26,16 @@ private PatronIdCache(long ttl, long nullTokenTtl, int capacity) {
   }
 
   /**
-   * Get the PatronIdCache singleton. the singleton must be initialize before
+   * Get the PatronIdCache singleton. the singleton must be initialized before
    * calling this method.
    *
-   * @see {@link #initialize(long, int)}
+   * @see {@link #initialize(long, long, int)}
    *
    * @return the PatronIdCache singleton instance.
    */
   public static synchronized PatronIdCache getInstance() {
     if (instance == null) {
-      throw new NotInitializedException(
+      throw new PatronIdCacheNotInitializedException(
           "You must call PatronIdCache.initialize(ttl, capacity) before you can get the singleton instance");
     }
     return instance;
@@ -71,11 +71,11 @@ private String computeKey(String tenant, String externalId) {
     return String.format("%s:%s", tenant, externalId);
   }
 
-  public static class NotInitializedException extends RuntimeException {
+  public static class PatronIdCacheNotInitializedException extends RuntimeException {
 
     private static final long serialVersionUID = 4747532964596334577L;
 
-    public NotInitializedException(String msg) {
+    public PatronIdCacheNotInitializedException(String msg) {
       super(msg);
     }
   }
diff --git a/src/main/java/org/folio/edge/patron/utils/PatronIdHelper.java b/src/main/java/org/folio/edge/patron/utils/PatronIdHelper.java
index 3193fde..4419665 100644
--- a/src/main/java/org/folio/edge/patron/utils/PatronIdHelper.java
+++ b/src/main/java/org/folio/edge/patron/utils/PatronIdHelper.java
@@ -3,7 +3,6 @@
 import io.vertx.core.Future;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.folio.edge.core.cache.TokenCache.NotInitializedException;
 import org.folio.edge.patron.cache.PatronIdCache;
 
 public class PatronIdHelper {
@@ -19,7 +18,7 @@ public static Future<String> lookupPatron(PatronOkapiClient client, String tenan
     try {
       PatronIdCache cache = PatronIdCache.getInstance();
       patronId = cache.get(tenant, extPatronId);
-    } catch (NotInitializedException e) {
+    } catch (PatronIdCache.PatronIdCacheNotInitializedException e) {
       logger.warn("Failed to access PatronIdCache", e);
     }