diff --git a/.gitignore b/.gitignore
index 260dbbf..4f65755 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@ out
 .idea
 .gradle
 *.iml
-*.class
\ No newline at end of file
+*.class
+.idea
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
deleted file mode 100644
index 5d1912a..0000000
--- a/.idea/workspace.xml
+++ /dev/null
@@ -1,1142 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ChangeListManager">
-    <list default="true" id="8a106497-0776-4132-961a-0ff15939e866" name="Default" comment="remove workspace config">
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/example/cryptotrading/Part3CryptoPlatform.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/example/cryptotrading/Part3CryptoPlatform.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/example/cryptotrading/external/CryptoConnectionHolder.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/example/cryptotrading/external/CryptoConnectionHolder.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/example/cryptotrading/external/ReactiveCryptoListener.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/example/cryptotrading/external/ReactiveCryptoListener.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/example/essential/Part1CreationTransformationTermination.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/example/essential/Part1CreationTransformationTermination.java" afterDir="false" />
-    </list>
-    <option name="TRACKING_ENABLED" value="true" />
-    <option name="SHOW_DIALOG" value="false" />
-    <option name="HIGHLIGHT_CONFLICTS" value="true" />
-    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
-    <option name="LAST_RESOLUTION" value="IGNORE" />
-  </component>
-  <component name="ExternalProjectsData">
-    <projectState path="$PROJECT_DIR$">
-      <ProjectState />
-    </projectState>
-  </component>
-  <component name="FileEditorManager">
-    <leaf>
-      <file leaf-file-name="CryptoConnectionHolder.java" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/com/example/cryptotrading/external/CryptoConnectionHolder.java">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="60">
-              <caret line="8" column="13" selection-start-line="8" selection-start-column="13" selection-end-line="8" selection-end-column="13" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file leaf-file-name="Part21CreationTransformationTermination.java" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/com/example/advanced/Part21CreationTransformationTermination.java">
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-            <state relative-caret-position="1005">
-              <caret line="72" selection-start-line="72" selection-end-line="72" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file leaf-file-name="Part3CryptoPlatform.java" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/com/example/cryptotrading/Part3CryptoPlatform.java">
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-            <state relative-caret-position="375">
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-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file leaf-file-name="ReactiveCryptoListener.java" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/com/example/cryptotrading/external/ReactiveCryptoListener.java">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="183">
-              <caret line="35" selection-start-line="35" selection-end-line="35" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file leaf-file-name="StatisticUtils.java" pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/src/main/java/com/example/cryptotrading/utils/StatisticUtils.java">
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-            <state relative-caret-position="345">
-              <caret line="36" column="18" lean-forward="true" selection-start-line="36" selection-start-column="18" selection-end-line="36" selection-end-column="18" />
-              <folding>
-                <element signature="imports" expanded="true" />
-              </folding>
-            </state>
-          </provider>
-        </entry>
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-  <component name="Git.Settings">
-    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
-  </component>
-  <component name="GradleLocalSettings">
-    <option name="myGradleHomes">
-      <map>
-        <entry key="$PROJECT_DIR$" value="$USER_HOME$/.gradle/wrapper/dists/gradle-4.0-all/ac27o8rbd0ic8ih41or9l32mv/gradle-4.0" />
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-      <map>
-        <entry key="$PROJECT_DIR$" value="4.0" />
-      </map>
-    </option>
-    <option name="availableProjects">
-      <map>
-        <entry>
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-              <option name="name" value="crypto-trading-platform" />
-              <option name="path" value="$PROJECT_DIR$" />
-            </ExternalProjectPojo>
-          </key>
-          <value>
-            <list>
-              <ExternalProjectPojo>
-                <option name="name" value="crypto-trading-platform" />
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-            </list>
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-    <option name="availableTasks">
-      <map>
-        <entry key="$PROJECT_DIR$">
-          <value>
-            <list>
-              <ExternalTaskPojo>
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-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="components" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
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-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
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-                <option name="name" value="projects" />
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-                <option name="name" value="classes" />
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-              <ExternalTaskPojo>
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-                <option name="name" value="wrapper" />
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-                <option name="name" value="javadoc" />
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-                <option name="name" value="jar" />
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-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
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-                <option name="name" value="processResources" />
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-                <option name="name" value="tasks" />
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-                <option name="description" value="Initializes a new Gradle build." />
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-                <option name="name" value="buildNeeded" />
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-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="properties" />
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-            </list>
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-    </option>
-    <option name="modificationStamps">
-      <map>
-        <entry key="$PROJECT_DIR$" value="4542198956000" />
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-    <option name="projectBuildClasspath">
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-          <value>
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-              <option name="modulesBuildClasspath">
-                <map>
-                  <entry key="$PROJECT_DIR$">
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-                      <ExternalModuleBuildClasspathPojo>
-                        <option name="path" value="$PROJECT_DIR$" />
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-              <option name="projectBuildClasspath">
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-      <provider selected="true" editor-type-id="text-editor">
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-        </state>
-      </provider>
-    </entry>
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-      <provider selected="true" editor-type-id="text-editor">
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-    </entry>
-    <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/io.projectreactor/reactor-core/3.2.0.BUILD-SNAPSHOT/6a57578f62998106a4c1dc3f04f9ee8d5d0900b3/reactor-core-3.2.0.BUILD-SNAPSHOT-sources.jar!/reactor/core/publisher/OnNextFailureStrategy.java">
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-    <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/io.projectreactor/reactor-core/3.2.0.BUILD-SNAPSHOT/6a57578f62998106a4c1dc3f04f9ee8d5d0900b3/reactor-core-3.2.0.BUILD-SNAPSHOT-sources.jar!/reactor/core/publisher/Hooks.java">
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-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/build.gradle">
-      <provider selected="true" editor-type-id="text-editor">
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-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/example/advanced/Part23ResilienceResponsive.java">
-      <provider selected="true" editor-type-id="text-editor">
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-    <entry file="file://$PROJECT_DIR$/src/main/java/com/example/advanced/Part22MultithreadingParallelization.java">
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-        </state>
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-      </provider>
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-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/example/essential/Part1CreationTransformationTermination.java">
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-    </entry>
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-      <provider selected="true" editor-type-id="text-editor">
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-        </state>
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-        </state>
-      </provider>
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-    <entry file="file://$PROJECT_DIR$/src/main/java/com/example/cryptotrading/external/CryptoConnectionHolder.java">
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-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/example/cryptotrading/external/ReactiveCryptoListener.java">
-      <provider selected="true" editor-type-id="text-editor">
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-          <caret line="35" selection-start-line="35" selection-end-line="35" />
-        </state>
-      </provider>
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-    <entry file="file://$PROJECT_DIR$/src/main/java/com/example/cryptotrading/Part3CryptoPlatform.java">
-      <provider selected="true" editor-type-id="text-editor">
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-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/example/cryptotrading/utils/StatisticUtils.java">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="345">
-          <caret line="36" column="18" lean-forward="true" selection-start-line="36" selection-start-column="18" selection-end-line="36" selection-end-column="18" />
-          <folding>
-            <element signature="imports" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-  </component>
-</project>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index feb4c66..c9c495a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,9 +2,19 @@ group 'com.example'
 version '0.0.1-SNAPSHOT'
 
 apply plugin: 'java'
+apply plugin: "net.ltgt.apt"
+buildscript {
+    repositories {
+        maven {
+            url "https://plugins.gradle.org/m2/"
+        }
+    }
+    dependencies {
+        classpath "net.ltgt.gradle:gradle-apt-plugin:0.13"
+    }
+}
 
-sourceCompatibility = 1.8
-
+sourceCompatibility = 1.9
 
 repositories {
     mavenCentral()
@@ -13,7 +23,7 @@ repositories {
 }
 
 ext {
-    lombokVersion = '1.16.18'
+    lombokVersion = '1.16.20'
     jacksonVersion = '2.9.2'
     socketioVersion = '1.0.0'
     reactorVersion = '3.2.0.BUILD-SNAPSHOT'
@@ -24,7 +34,7 @@ ext {
 }
 
 dependencies {
-    compile group: 'io.reactivex', name:'rxjava', version: rxJava1Version
+    compile group: 'io.reactivex', name: 'rxjava', version: rxJava1Version
     compile group: 'io.socket', name: 'socket.io-client', version: socketioVersion
     compile group: 'io.projectreactor.ipc', name: 'reactor-netty', version: reactorNettyVersion
     compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: jacksonVersion
@@ -32,7 +42,11 @@ dependencies {
     compile group: 'junit', name: 'junit', version: '4.12'
     compile group: 'io.projectreactor', name: 'reactor-test', version: reactorVersion
 
-    testCompile group: 'org.powermock', name:'powermock-module-junit4', version: powerMockVersion
+    compileOnly group: 'org.projectlombok', name: 'lombok', version: lombokVersion
+
+    apt group: 'org.projectlombok', name: 'lombok', version: lombokVersion
+
+    testCompile group: 'org.powermock', name: 'powermock-module-junit4', version: powerMockVersion
     testCompile group: 'org.powermock', name: 'powermock-api-mockito2', version: powerMockVersion
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 4d1893f..a5fe1cb 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index f5df6d6..288472a 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
-#Sun Dec 03 12:42:02 EET 2017
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.5-bin.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-all.zip
+zipStoreBase=GRADLE_USER_HOME
diff --git a/src/main/java/com/example/common/StringEmitter.java b/src/main/java/com/example/common/StringEmitter.java
index a900af8..44ca941 100644
--- a/src/main/java/com/example/common/StringEmitter.java
+++ b/src/main/java/com/example/common/StringEmitter.java
@@ -3,6 +3,5 @@
 import java.util.function.Consumer;
 
 public interface StringEmitter {
-
     void onString(Consumer<String> consumer);
 }
diff --git a/src/main/java/com/example/cryptotrading/StatisticMessage.java b/src/main/java/com/example/cryptotrading/StatisticMessage.java
index 4b4c4a1..3798481 100644
--- a/src/main/java/com/example/cryptotrading/StatisticMessage.java
+++ b/src/main/java/com/example/cryptotrading/StatisticMessage.java
@@ -1,12 +1,19 @@
 package com.example.cryptotrading;
 
+import lombok.Data;
+import lombok.experimental.FieldDefaults;
+
 import java.time.Instant;
 
+import static lombok.AccessLevel.PRIVATE;
+
+@Data
+@FieldDefaults(level = PRIVATE, makeFinal = true)
 public class StatisticMessage {
-    private final long timestamp;
-    private final float data;
-    private final String currency;
-    private final StatisticMessage.Type type;
+    long timestamp;
+    float data;
+    String currency;
+    StatisticMessage.Type type;
 
     public StatisticMessage(float data, String currency, Type type) {
         this.timestamp = Instant.now().toEpochMilli();
@@ -15,56 +22,6 @@ public StatisticMessage(float data, String currency, Type type) {
         this.type = type;
     }
 
-    public float getData() {
-        return this.data;
-    }
-
-    public String getCurrency() {
-        return this.currency;
-    }
-
-    public Type getType() {
-        return this.type;
-    }
-
-    public long getTimestamp() {
-        return timestamp;
-    }
-
-    public boolean equals(Object o) {
-        if (o == this) return true;
-        if (!(o instanceof StatisticMessage)) return false;
-        final StatisticMessage other = (StatisticMessage) o;
-        if (Float.compare(this.getData(), other.getData()) != 0) return false;
-        final Object this$currency = this.getCurrency();
-        final Object other$currency = other.getCurrency();
-        if (this$currency == null ? other$currency != null : !this$currency.equals(other$currency)) return false;
-        final Object this$type = this.getType();
-        final Object other$type = other.getType();
-        if (this$type == null ? other$type != null : !this$type.equals(other$type)) return false;
-        final Object this$timestamp = this.getTimestamp();
-        final Object other$timestamp = other.getTimestamp();
-        if (!this$timestamp.equals(other$timestamp)) return false;
-        return true;
-    }
-
-    public int hashCode() {
-        final int PRIME = 59;
-        int result = 1;
-        result = result * PRIME + Float.floatToIntBits(this.getData());
-        final Object $currency = this.getCurrency();
-        result = result * PRIME + ($currency == null ? 43 : $currency.hashCode());
-        final Object $type = this.getType();
-        result = result * PRIME + ($type == null ? 43 : $type.hashCode());
-        final Object $timestamp = this.getTimestamp();
-        result = result * PRIME + ($timestamp.hashCode());
-        return result;
-    }
-
-    public String toString() {
-        return "StatisticMessage(data=" + this.getData() + ", currency=" + this.getCurrency() + ", type=" + this.getType() + ", timestamp=" + this.getTimestamp() + ")";
-    }
-
     public enum Type {
         PRICE, AVG
     }
diff --git a/src/main/java/com/example/cryptotrading/utils/StatisticUtils.java b/src/main/java/com/example/cryptotrading/utils/StatisticUtils.java
index cb04481..4b3bbbb 100644
--- a/src/main/java/com/example/cryptotrading/utils/StatisticUtils.java
+++ b/src/main/java/com/example/cryptotrading/utils/StatisticUtils.java
@@ -1,16 +1,19 @@
 package com.example.cryptotrading.utils;
 
 import com.example.cryptotrading.StatisticMessage;
+import lombok.experimental.FieldDefaults;
 import reactor.core.publisher.Flux;
 
 import java.util.Map;
 
+import static lombok.AccessLevel.PRIVATE;
+
+@FieldDefaults(level = PRIVATE, makeFinal = true)
 public class StatisticUtils {
-    private static final String PRICE_KEY = "PRICE";
-    private static final String CURRENCY_KEY = "FROMSYMBOL";
+    static String PRICE_KEY = "PRICE";
+    static String CURRENCY_KEY = "FROMSYMBOL";
 
-    public static Flux<StatisticMessage> transform(Flux<Map<String, Object>> input,
-                                                   Flux<Long> averagesTimeInterval) {
+    public static Flux<StatisticMessage> transform(Flux<Map<String, Object>> input, Flux<Long> averagesTimeInterval) {
         throw new RuntimeException("Not implemented yet");
 
 
@@ -21,24 +24,24 @@ public static Flux<StatisticMessage> transform(Flux<Map<String, Object>> input,
 //        return Flux.merge(
 
 
-                // --------------------------------------------------------------------------------------------------
-
-                // 1.1)   TODO Collect crypto currency price during the interval of seconds
-                //        HINT consider corner case when client did not send any info about interval (add initial interval (mergeWith(...)))
-                //        HINT use window + switchMap
-                // 1.2)   TODO group collected Maps result by currency
-                //        HINT to get currency name from the Map use CURRENCY_KEY constant
-                //        HINT for reduce consider to reuse Sum.empty and Sum#add
-                // 1.3.1) TODO Filter grouped stream on map without price info
-                // 1.3.2) TODO Grouped filtered stream reduce calculate average
-                // 1.3.3) TODO map to Statistic message using StatisticMessage#avg()
-                //input...,
-
-                //
-                // 2.1)   TODO hold latest event with currency price to send latest price if new incoming event does not include price info
-                //        HINT use .scan() + HashMap + .filter to ensure that after proper scan passed map include Price
-                // 2.2)   TODO map to Statistic message using StatisticMessage#price()
-                //input...
+        // --------------------------------------------------------------------------------------------------
+
+        // 1.1)   TODO Collect crypto currency price during the interval of seconds
+        //        HINT consider corner case when client did not send any info about interval (add initial interval (mergeWith(...)))
+        //        HINT use window + switchMap
+        // 1.2)   TODO group collected Maps result by currency
+        //        HINT to get currency name from the Map use CURRENCY_KEY constant
+        //        HINT for reduce consider to reuse Sum.empty and Sum#add
+        // 1.3.1) TODO Filter grouped stream on map without price info
+        // 1.3.2) TODO Grouped filtered stream reduce calculate average
+        // 1.3.3) TODO map to Statistic message using StatisticMessage#avg()
+        //input...,
+
+        //
+        // 2.1)   TODO hold latest event with currency price to send latest price if new incoming event does not include price info
+        //        HINT use .scan() + HashMap + .filter to ensure that after proper scan passed map include Price
+        // 2.2)   TODO map to Statistic message using StatisticMessage#price()
+        //input...
 //        );
     }
 
diff --git a/src/main/java/com/example/cryptotrading/utils/Sum.java b/src/main/java/com/example/cryptotrading/utils/Sum.java
index 2de5316..06d2b90 100644
--- a/src/main/java/com/example/cryptotrading/utils/Sum.java
+++ b/src/main/java/com/example/cryptotrading/utils/Sum.java
@@ -1,52 +1,13 @@
 package com.example.cryptotrading.utils;
 
-public class Sum {
-    private final float value;
-    private final int counter;
-
-    public Sum(float value, int counter) {
-        this.value = value;
-        this.counter = counter;
-    }
-
-    public Sum add(float value) {
-        return new Sum(this.value + value, this.counter + 1);
-    }
-
-    public float avg() {
-        return value / counter;
-    }
-
-    public static Sum empty() {
-        return new Sum(0, 0);
-    }
+import lombok.Data;
+import lombok.experimental.FieldDefaults;
 
-    public float getValue() {
-        return this.value;
-    }
+import static lombok.AccessLevel.PRIVATE;
 
-    public int getCounter() {
-        return this.counter;
-    }
-
-    public boolean equals(Object o) {
-        if (o == this) return true;
-        if (!(o instanceof Sum)) return false;
-        final Sum other = (Sum) o;
-        if (Float.compare(this.getValue(), other.getValue()) != 0) return false;
-        if (this.getCounter() != other.getCounter()) return false;
-        return true;
-    }
-
-    public int hashCode() {
-        final int PRIME = 59;
-        int result = 1;
-        result = result * PRIME + Float.floatToIntBits(this.getValue());
-        result = result * PRIME + this.getCounter();
-        return result;
-    }
-
-    public String toString() {
-        return "Sum(value=" + this.getValue() + ", counter=" + this.getCounter() + ")";
-    }
+@Data
+@FieldDefaults(level = PRIVATE, makeFinal = true)
+public class Sum {
+    float value;
+    int counter;
 }
diff --git a/src/main/java/com/example/essential/IndexedWord.java b/src/main/java/com/example/essential/IndexedWord.java
index f040196..3fd5cb0 100644
--- a/src/main/java/com/example/essential/IndexedWord.java
+++ b/src/main/java/com/example/essential/IndexedWord.java
@@ -1,45 +1,15 @@
 package com.example.essential;
 
-import java.util.Objects;
+import lombok.Data;
+import lombok.NonNull;
+import lombok.experimental.FieldDefaults;
 
-public class IndexedWord {
-    private final int index;
-    private final String word;
-
-    public IndexedWord(int index, String word) {
-        this.index = index;
-        this.word = Objects.requireNonNull(word);
-    }
-
-    public int getIndex() {
-        return this.index;
-    }
-
-    public String getWord() {
-        return this.word;
-    }
+import static lombok.AccessLevel.PRIVATE;
 
-    public boolean equals(Object o) {
-        if (o == this) return true;
-        if (!(o instanceof IndexedWord)) return false;
-        final IndexedWord other = (IndexedWord) o;
-        if (this.getIndex() != other.getIndex()) return false;
-        final Object this$word = this.getWord();
-        final Object other$word = other.getWord();
-        if (this$word == null ? other$word != null : !this$word.equals(other$word)) return false;
-        return true;
-    }
-
-    public int hashCode() {
-        final int PRIME = 59;
-        int result = 1;
-        result = result * PRIME + this.getIndex();
-        final Object $word = this.getWord();
-        result = result * PRIME + ($word == null ? 43 : $word.hashCode());
-        return result;
-    }
-
-    public String toString() {
-        return "IndexedWord(index=" + this.getIndex() + ", word=" + this.getWord() + ")";
-    }
+@Data
+@FieldDefaults(level = PRIVATE, makeFinal = true)
+public class IndexedWord {
+    int index;
+    @NonNull
+    String word;
 }
diff --git a/src/main/java/com/example/store/Order.java b/src/main/java/com/example/store/Order.java
index ae68582..a431cd4 100644
--- a/src/main/java/com/example/store/Order.java
+++ b/src/main/java/com/example/store/Order.java
@@ -1,19 +1,21 @@
 package com.example.store;
 
+import lombok.Data;
+import lombok.NonNull;
+import lombok.experimental.FieldDefaults;
 import rx.Observable;
 
-import java.util.Objects;
+import static lombok.AccessLevel.PRIVATE;
 
+@Data
+@FieldDefaults(level = PRIVATE, makeFinal = true)
 public class Order {
-    private final String id;
-    private final String userId;
-    private final Iterable<String> productsIds;
-
-    public Order(String id, String userId, Iterable<String> productsIds) {
-        this.id = Objects.requireNonNull(id);
-        this.userId = Objects.requireNonNull(userId);
-        this.productsIds = Objects.requireNonNull(productsIds);
-    }
+    @NonNull
+    String id;
+    @NonNull
+    String userId;
+    @NonNull
+    Iterable<String> productsIds;
 
     public Observable<Long> getTotalPrice() {
         // TODO: use reduce to find the sum;
@@ -22,49 +24,4 @@ public Observable<Long> getTotalPrice() {
         // HINT: Observable.from + Observable#map + Observable#reduce
         throw new RuntimeException("Not implemented yet");
     }
-
-    public String getId() {
-        return this.id;
-    }
-
-    public String getUserId() {
-        return this.userId;
-    }
-
-    public Iterable<String> getProductsIds() {
-        return this.productsIds;
-    }
-
-    public boolean equals(Object o) {
-        if (o == this) return true;
-        if (!(o instanceof Order)) return false;
-        final Order other = (Order) o;
-        final Object this$id = this.getId();
-        final Object other$id = other.getId();
-        if (this$id == null ? other$id != null : !this$id.equals(other$id)) return false;
-        final Object this$userId = this.getUserId();
-        final Object other$userId = other.getUserId();
-        if (this$userId == null ? other$userId != null : !this$userId.equals(other$userId)) return false;
-        final Object this$productsIds = this.getProductsIds();
-        final Object other$productsIds = other.getProductsIds();
-        if (this$productsIds == null ? other$productsIds != null : !this$productsIds.equals(other$productsIds))
-            return false;
-        return true;
-    }
-
-    public int hashCode() {
-        final int PRIME = 59;
-        int result = 1;
-        final Object $id = this.getId();
-        result = result * PRIME + ($id == null ? 43 : $id.hashCode());
-        final Object $userId = this.getUserId();
-        result = result * PRIME + ($userId == null ? 43 : $userId.hashCode());
-        final Object $productsIds = this.getProductsIds();
-        result = result * PRIME + ($productsIds == null ? 43 : $productsIds.hashCode());
-        return result;
-    }
-
-    public String toString() {
-        return "Order(id=" + this.getId() + ", userId=" + this.getUserId() + ", productsIds=" + this.getProductsIds() + ")";
-    }
 }
diff --git a/src/main/java/com/example/store/Product.java b/src/main/java/com/example/store/Product.java
index cad44df..7eb60f6 100644
--- a/src/main/java/com/example/store/Product.java
+++ b/src/main/java/com/example/store/Product.java
@@ -1,57 +1,17 @@
 package com.example.store;
 
-import java.util.Objects;
+import lombok.Data;
+import lombok.NonNull;
+import lombok.experimental.FieldDefaults;
 
-public class Product {
-    private final String id;
-    private final String name;
-    private final long price;
-
-    public Product(String id, String name, long price) {
-        this.id = Objects.requireNonNull(id);
-        this.name = Objects.requireNonNull(name);
-        this.price = Objects.requireNonNull(price);
-    }
-
-    public String getId() {
-        return this.id;
-    }
-
-    public String getName() {
-        return this.name;
-    }
+import static lombok.AccessLevel.PRIVATE;
 
-    public long getPrice() {
-        return this.price;
-    }
-
-    public boolean equals(Object o) {
-        if (o == this) return true;
-        if (!(o instanceof Product)) return false;
-        final Product other = (Product) o;
-        final Object this$id = this.getId();
-        final Object other$id = other.getId();
-        if (this$id == null ? other$id != null : !this$id.equals(other$id)) return false;
-        final Object this$name = this.getName();
-        final Object other$name = other.getName();
-        if (this$name == null ? other$name != null : !this$name.equals(other$name)) return false;
-        if (this.getPrice() != other.getPrice()) return false;
-        return true;
-    }
-
-    public int hashCode() {
-        final int PRIME = 59;
-        int result = 1;
-        final Object $id = this.getId();
-        result = result * PRIME + ($id == null ? 43 : $id.hashCode());
-        final Object $name = this.getName();
-        result = result * PRIME + ($name == null ? 43 : $name.hashCode());
-        final long $price = this.getPrice();
-        result = result * PRIME + (int) ($price >>> 32 ^ $price);
-        return result;
-    }
-
-    public String toString() {
-        return "Product(id=" + this.getId() + ", name=" + this.getName() + ", price=" + this.getPrice() + ")";
-    }
+@Data
+@FieldDefaults(level = PRIVATE, makeFinal = true)
+public class Product {
+    @NonNull
+    String id;
+    @NonNull
+    String name;
+    long price;
 }
diff --git a/src/main/java/com/example/store/ProductsCatalog.java b/src/main/java/com/example/store/ProductsCatalog.java
index 9ab06c9..8c23069 100644
--- a/src/main/java/com/example/store/ProductsCatalog.java
+++ b/src/main/java/com/example/store/ProductsCatalog.java
@@ -1,12 +1,18 @@
 package com.example.store;
 
+import lombok.experimental.FieldDefaults;
+
+import java.security.SecureRandom;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Random;
 
+import static lombok.AccessLevel.PRIVATE;
+
+@FieldDefaults(level = PRIVATE, makeFinal = true)
 public class ProductsCatalog {
-    private static Random random = new Random();
-    private static List<String> PRODUCTS_NAMES = Arrays.asList(
+    static Random random = new SecureRandom();
+    static List<String> PRODUCTS_NAMES = Arrays.asList(
             "Phone",
             "TV",
             "SonyPlayStation",
diff --git a/src/main/java/com/example/store/UserActivityUtils.java b/src/main/java/com/example/store/UserActivityUtils.java
index fc48135..69e3d0b 100644
--- a/src/main/java/com/example/store/UserActivityUtils.java
+++ b/src/main/java/com/example/store/UserActivityUtils.java
@@ -4,7 +4,6 @@
 import rx.Observable;
 
 public class UserActivityUtils {
-
     public static Observable<Product> findMostExpansivePurchase(Observable<Order> ordersHistory) {
         // TODO: flatten all Products inside Orders and using reduce find one with the highest price
         throw new RuntimeException("Not implemented yet");
diff --git a/src/test/java/com/example/common/TestStringEmitter.java b/src/test/java/com/example/common/TestStringEmitter.java
index b6795cb..d6fd922 100644
--- a/src/test/java/com/example/common/TestStringEmitter.java
+++ b/src/test/java/com/example/common/TestStringEmitter.java
@@ -3,8 +3,7 @@
 import java.util.function.Consumer;
 
 public class TestStringEmitter implements StringEmitter {
-
-   public Consumer<String> consumer;
+    public Consumer<String> consumer;
 
     @Override
     public void onString(Consumer<String> consumer) {
diff --git a/src/test/java/com/example/cryptotrading/utils/StatisticUtilsTest.java b/src/test/java/com/example/cryptotrading/utils/StatisticUtilsTest.java
index f3e9052..a6c2009 100644
--- a/src/test/java/com/example/cryptotrading/utils/StatisticUtilsTest.java
+++ b/src/test/java/com/example/cryptotrading/utils/StatisticUtilsTest.java
@@ -3,7 +3,6 @@
 import org.junit.Test;
 
 public class StatisticUtilsTest {
-
     //FIXME consider to verify all corner cases
 
     @Test