Fix variable hiding issues in BulkScanWorkerManager and MongoPersistenceProvider

- Renamed local variable 'instance' to 'manager' in BulkScanWorkerManager.handleStatic() to avoid shadowing the static field
- Renamed parameter 'serializers' to 'serializersToRegister' in MongoPersistenceProvider.registerSerializer() to avoid shadowing the static field
- Renamed parameter 'modules' to 'modulesToRegister' in MongoPersistenceProvider.registerModule() to avoid shadowing the static field

These changes resolve the variable hiding warnings identified in issue #17.

Author: TLS-Attacker Developer

src/main/java/de/rub/nds/crawler/core/BulkScanWorkerManager.java

@@ -41,8 +41,8 @@ public static Future<Document> handleStatic(
             ScanJobDescription scanJobDescription,
             int parallelConnectionThreads,
             int parallelScanThreads) {
-        BulkScanWorkerManager instance = getInstance();
-        return instance.handle(scanJobDescription, parallelConnectionThreads, parallelScanThreads);
+        BulkScanWorkerManager manager = getInstance();
+        return manager.handle(scanJobDescription, parallelConnectionThreads, parallelScanThreads);
     }
 
     private final Cache<String, BulkScanWorker<?>> bulkScanWorkers;

src/main/java/de/rub/nds/crawler/persistence/MongoPersistenceProvider.java

@@ -64,8 +64,8 @@ public static void registerSerializer(JsonSerializer<?> serializer) {
         }
     }
 
-    public static void registerSerializer(JsonSerializer<?>... serializers) {
-        for (JsonSerializer<?> serializer : serializers) {
+    public static void registerSerializer(JsonSerializer<?>... serializersToRegister) {
+        for (JsonSerializer<?> serializer : serializersToRegister) {
             registerSerializer(serializer);
         }
     }
@@ -79,8 +79,8 @@ public static void registerModule(Module module) {
         }
     }
 
-    public static void registerModule(Module... modules) {
-        for (Module module : modules) {
+    public static void registerModule(Module... modulesToRegister) {
+        for (Module module : modulesToRegister) {
             registerModule(module);
         }
     }