diff --git a/pom.xml b/pom.xml
index 6b43a82..add015f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>org.sadtech.bot</groupId>
     <artifactId>bot-core</artifactId>
-    <version>0.5.0-RELEASE</version>
+    <version>0.5.1-RELEASE</version>
     <packaging>jar</packaging>
 
     <build>
diff --git a/src/main/java/org/sadtech/bot/core/repository/impl/EventRepositoryQueue.java b/src/main/java/org/sadtech/bot/core/repository/impl/EventRepositoryQueue.java
index 8f191b5..ed9ad45 100644
--- a/src/main/java/org/sadtech/bot/core/repository/impl/EventRepositoryQueue.java
+++ b/src/main/java/org/sadtech/bot/core/repository/impl/EventRepositoryQueue.java
@@ -8,7 +8,7 @@ import java.util.concurrent.ConcurrentLinkedQueue;
 
 public class EventRepositoryQueue implements EventRepository<JsonObject> {
 
-    private Queue<JsonObject> jsonObjects = new ConcurrentLinkedQueue<>();
+    private final Queue<JsonObject> jsonObjects = new ConcurrentLinkedQueue<>();
 
     @Override
     public void add(JsonObject jsonObject) {
diff --git a/src/main/java/org/sadtech/bot/core/repository/impl/MailRepositoryList.java b/src/main/java/org/sadtech/bot/core/repository/impl/MailRepositoryList.java
index dc753f2..6012f54 100644
--- a/src/main/java/org/sadtech/bot/core/repository/impl/MailRepositoryList.java
+++ b/src/main/java/org/sadtech/bot/core/repository/impl/MailRepositoryList.java
@@ -11,7 +11,7 @@ import java.util.concurrent.ConcurrentLinkedQueue;
 
 public class MailRepositoryList implements EventRepository<Mail>, MailRepository {
 
-    private List<Mail> messages = new ArrayList<>();
+    private final List<Mail> messages = new ArrayList<>();
 
     @Override
     public void add(Mail mail) {
diff --git a/src/main/java/org/sadtech/bot/core/repository/impl/PersonRepositoryMap.java b/src/main/java/org/sadtech/bot/core/repository/impl/PersonRepositoryMap.java
index ba212f1..905befb 100644
--- a/src/main/java/org/sadtech/bot/core/repository/impl/PersonRepositoryMap.java
+++ b/src/main/java/org/sadtech/bot/core/repository/impl/PersonRepositoryMap.java
@@ -11,7 +11,7 @@ import java.util.concurrent.ConcurrentLinkedQueue;
 
 public class PersonRepositoryMap implements EventRepository<Person>, PersonRepository {
 
-    private Map<Integer, Person> personMap = new HashMap<>();
+    private final Map<Integer, Person> personMap = new HashMap<>();
 
     @Override
     public void add(Person person) {
diff --git a/src/main/java/org/sadtech/bot/core/repository/impl/TerminalComandRepositoryQueue.java b/src/main/java/org/sadtech/bot/core/repository/impl/TerminalComandRepositoryQueue.java
index 24cc99a..3e6b681 100644
--- a/src/main/java/org/sadtech/bot/core/repository/impl/TerminalComandRepositoryQueue.java
+++ b/src/main/java/org/sadtech/bot/core/repository/impl/TerminalComandRepositoryQueue.java
@@ -8,7 +8,7 @@ import java.util.concurrent.ConcurrentLinkedQueue;
 
 public class TerminalComandRepositoryQueue implements EventRepository<Mail> {
 
-    private Queue<Mail> mailQueue = new ConcurrentLinkedQueue<>();
+    private final Queue<Mail> mailQueue = new ConcurrentLinkedQueue<>();
 
     @Override
     public void add(Mail dataObject) {
diff --git a/src/main/java/org/sadtech/bot/core/service/RawEventService.java b/src/main/java/org/sadtech/bot/core/service/RawEventService.java
index f627bbd..46e43f3 100644
--- a/src/main/java/org/sadtech/bot/core/service/RawEventService.java
+++ b/src/main/java/org/sadtech/bot/core/service/RawEventService.java
@@ -15,6 +15,4 @@ public interface RawEventService {
 
     EventRepository getEventRepository();
 
-    void replacementEventRepository(EventRepository eventRepository);
-
 }
\ No newline at end of file
diff --git a/src/main/java/org/sadtech/bot/core/service/impl/RawEventServiceImpl.java b/src/main/java/org/sadtech/bot/core/service/impl/RawEventServiceImpl.java
index f67ea02..7232f89 100644
--- a/src/main/java/org/sadtech/bot/core/service/impl/RawEventServiceImpl.java
+++ b/src/main/java/org/sadtech/bot/core/service/impl/RawEventServiceImpl.java
@@ -9,9 +9,9 @@ import java.util.Queue;
 
 public class RawEventServiceImpl implements RawEventService {
 
-    public static final Logger log = Logger.getLogger(RawEventServiceImpl.class);
+    private static final Logger log = Logger.getLogger(RawEventServiceImpl.class);
 
-    private EventRepository eventRepository;
+    private final EventRepository eventRepository;
 
     public RawEventServiceImpl(EventRepository eventRepository) {
         this.eventRepository = eventRepository;
@@ -39,9 +39,4 @@ public class RawEventServiceImpl implements RawEventService {
         return eventRepository;
     }
 
-    @Override
-    public void replacementEventRepository(EventRepository eventRepository) {
-        this.eventRepository = eventRepository;
-    }
-
 }