Enhance logging in entity locator factory

Enhanced logging to provide more detailed information when an entity
locator is not found, specifically distinguishing cases where a class is
missing due to unsupported parameter combinations from other exceptions.

Change-Id: I1ba84c622719c9b87c7f82966be24c9942ef3f07
Signed-off-by: Patrizio <patrizio.gelosi@amarulasolutions.com>

src/main/java/com/googlesource/gerrit/plugins/chatgpt/mode/stateful/client/code/context/ondemand/locator/CodeLocatorFactory.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/chatgpt/mode/stateful/client/code/context/ondemand/locator/CodeLocatorFactory.java b/src/main/java/com/googlesource/gerrit/plugins/chatgpt/mode/stateful/client/code/context/ondemand/locator/CodeLocatorFactory.java
index a4e40d2..de3b042 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/chatgpt/mode/stateful/client/code/context/ondemand/locator/CodeLocatorFactory.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/chatgpt/mode/stateful/client/code/context/ondemand/locator/CodeLocatorFactory.java
@@ -59,9 +59,11 @@
             entityLocator = clazz
                     .getDeclaredConstructor(Configuration.class, GerritChange.class, GitRepoFiles.class)
                     .newInstance(config, change, gitRepoFiles);
-        } catch (ClassNotFoundException | InvocationTargetException | InstantiationException | IllegalAccessException |
-                 NoSuchMethodException e) {
-            log.warn("Entity locator `{}` class not found for Get-Context Item: {}", className, chatGptGetContextItem);
+        } catch (ClassNotFoundException e) {
+            log.warn("Entity locator class not found for Get-Context Item: {}", chatGptGetContextItem);
+            throw new CodeContextOnDemandLocatorException(e);
+        } catch (InvocationTargetException | InstantiationException | IllegalAccessException | NoSuchMethodException e) {
+            log.error("Error instantiating class: {}", className, e);
             throw new CodeContextOnDemandLocatorException(e);
         }
         return entityLocator;