diff --git a/pom.xml b/pom.xml
index 185e3c8..7103068 100644
--- a/pom.xml
+++ b/pom.xml
@@ -33,7 +33,7 @@
     <properties>
         <gson.ver>2.8.5</gson.ver>
         <vksdk.ver>0.5.13-SNAPSHOT</vksdk.ver>
-        <log4j.ver>1.2.17</log4j.ver>
+        <slf4j.ver>1.7.26</slf4j.ver>
     </properties>
 
     <dependencies>
@@ -43,9 +43,9 @@
             <version>${gson.ver}</version>
         </dependency>
         <dependency>
-            <groupId>log4j</groupId>
-            <artifactId>log4j</artifactId>
-            <version>${log4j.ver}</version>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${slf4j.ver}</version>
         </dependency>
 
         <dependency>
diff --git a/src/main/java/org/sadtech/bot/core/domain/BoxAnswer.java b/src/main/java/org/sadtech/bot/core/domain/BoxAnswer.java
index e944b40..9248802 100644
--- a/src/main/java/org/sadtech/bot/core/domain/BoxAnswer.java
+++ b/src/main/java/org/sadtech/bot/core/domain/BoxAnswer.java
@@ -14,7 +14,7 @@ public class BoxAnswer {
 
     }
 
-    public BoxAnswer(BoxAnswer target) {
+    private BoxAnswer(BoxAnswer target) {
         if (target != null) {
             this.message = target.getMessage();
             this.keyboard = target.getKeyboard();
@@ -69,6 +69,45 @@ public class BoxAnswer {
         return new BoxAnswer(this);
     }
 
+    public static Builder builder() {
+        return new BoxAnswer().new Builder();
+    }
+
+    public class Builder {
+        private Builder() {
+
+        }
+
+        public Builder message(String message) {
+            BoxAnswer.this.message = message;
+            return this;
+        }
+
+        public Builder keyBoard(String keyBoard) {
+            BoxAnswer.this.keyboard = keyBoard;
+            return this;
+        }
+
+        public Builder lat(Float lat) {
+            BoxAnswer.this.lat = lat;
+            return this;
+        }
+
+        public Builder aLong(Float aLong) {
+            BoxAnswer.this.aLong = aLong;
+            return this;
+        }
+
+        public Builder steckerId(Integer stickerId) {
+            BoxAnswer.this.stickerId = stickerId;
+            return this;
+        }
+
+        public BoxAnswer build() {
+            return BoxAnswer.this;
+        }
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
diff --git a/src/main/java/org/sadtech/bot/core/domain/MailSend.java b/src/main/java/org/sadtech/bot/core/domain/MailSend.java
deleted file mode 100644
index 8238818..0000000
--- a/src/main/java/org/sadtech/bot/core/domain/MailSend.java
+++ /dev/null
@@ -1,66 +0,0 @@
-package org.sadtech.bot.core.domain;
-
-public class MailSend {
-
-    private String message;
-    private String keyboard;
-    private Float lat;
-    private Float aLong;
-    private Integer stickerId;
-
-    public MailSend() {
-
-    }
-
-    public String getKeyboard() {
-        return keyboard;
-    }
-
-    public void setKeyboard(String keyboard) {
-        this.keyboard = keyboard;
-    }
-
-    public String getMessage() {
-        return message;
-    }
-
-    public void setMessage(String message) {
-        this.message = message;
-    }
-
-    public Float getLat() {
-        return lat;
-    }
-
-    public void setLat(Float lat) {
-        this.lat = lat;
-    }
-
-    public Float getaLong() {
-        return aLong;
-    }
-
-    public void setaLong(Float aLong) {
-        this.aLong = aLong;
-    }
-
-    public Integer getStickerId() {
-        return stickerId;
-    }
-
-    public void setStickerId(Integer stickerId) {
-        this.stickerId = stickerId;
-    }
-
-    @Override
-    public String toString() {
-        return "MailSend{" +
-                "message='" + message + '\'' +
-                ", keyboard='" + keyboard + '\'' +
-                ", lat=" + lat +
-                ", aLong=" + aLong +
-                ", stickerId=" + stickerId +
-                '}';
-    }
-
-}
diff --git a/src/main/java/org/sadtech/bot/core/sender/Sent.java b/src/main/java/org/sadtech/bot/core/sender/Sent.java
index 63a33ba..120e56c 100644
--- a/src/main/java/org/sadtech/bot/core/sender/Sent.java
+++ b/src/main/java/org/sadtech/bot/core/sender/Sent.java
@@ -4,8 +4,8 @@ import org.sadtech.bot.core.domain.BoxAnswer;
 
 public interface Sent {
 
-    void send(Integer idPerson, String message);
+    void send(Integer personId, String message);
 
-    void send(Integer idPerson, BoxAnswer boxAnswer);
+    void send(Integer personId, BoxAnswer boxAnswer);
 
 }
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 7232f89..c592287 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
@@ -1,15 +1,16 @@
 package org.sadtech.bot.core.service.impl;
 
 import com.google.gson.JsonObject;
-import org.apache.log4j.Logger;
 import org.sadtech.bot.core.repository.EventRepository;
 import org.sadtech.bot.core.service.RawEventService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.Queue;
 
 public class RawEventServiceImpl implements RawEventService {
 
-    private static final Logger log = Logger.getLogger(RawEventServiceImpl.class);
+    private static final Logger log = LoggerFactory.getLogger(RawEventServiceImpl.class);
 
     private final EventRepository eventRepository;