BAEL-1041 Introduction to Caffeine (#2585)

* BAEL-748 quick guide to @Value

* BAEL-748 changes from review

* BAEL-748 inject comma-separated values into array

* BAEL-768 Introduction to Netty

* BAEL-768 remove commented code

* BAEL-861 Introduction to Awaitility

* BAEL-861 rename Test to UnitTest

* BAEL-1041 Introduction in Caffeine

* BAEL-1041 fix test

* BAEL-1041 fix formatting

* BAEL-1041 fix expected/actual order

* BAEL-1041 remove trailing underscore

* Formatting after merge

* BAEL-1041 add spaces between data and assertions

* BAEL-1041 soft values example

* BAEL-1041 remove duplicate dependency

* BAEL-1041 formatting fix

* BAEL-1041 formatting fix

libraries/src/main/java/com/baeldung/caffeine/DataObject.java

@@ -0,0 +1,28 @@
+package com.baeldung.caffeine;
+
+final class DataObject {
+    private final String data;
+
+    private static int objectCounter = 0;
+
+    private DataObject(String data) {
+        this.data = data;
+    }
+
+    public String getData() {
+        return data;
+    }
+
+    @Override
+    public String toString() {
+        return "DataObject{" +
+                "data='" + data + '\'' +
+                '}';
+    }
+
+    public static DataObject get(String data) {
+        objectCounter++;
+        System.out.println(String.format("Initializing DataObject#%d with data '%s'", objectCounter, data));
+        return new DataObject(data);
+    }
+}