[BAEL-18364] move spring-rest-*** articles - 1

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

@@ -0,0 +1,30 @@
+package com.baeldung.caffeine;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class DataObject {
+    private final String data;
+
+    private static int objectCounter = 0;
+    private static final Logger log = LoggerFactory.getLogger(DataObject.class);
+
+    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++;
+        log.info("Init DataObject#{} with '{}'", objectCounter, data);
+        return new DataObject(data);
+    }
+}