Changed package naming across all examples.

poison-pill/src/main/java/com/iluwatar/poisonpill/SimpleMessage.java

@@ -0,0 +1,39 @@
+package com.iluwatar.poisonpill;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * {@link Message} basic implementation
+ */
+public class SimpleMessage implements Message {
+
+	private Map<Headers, String> headers = new HashMap<>();
+	private String body;
+
+	@Override
+	public void addHeader(Headers header, String value) {
+		headers.put(header, value);
+	}
+
+	@Override
+	public String getHeader(Headers header) {
+		return headers.get(header);
+	}
+
+	@Override
+	public Map<Headers, String> getHeaders() {
+		return Collections.unmodifiableMap(headers);
+	}
+
+	@Override
+	public void setBody(String body) {
+		this.body = body;
+	}
+
+	@Override
+	public String getBody() {
+		return body;
+	}
+}