[pitboss] phase 20: Track M.2 — MessageHandler end-to-end (Kafka / SQS / Pub-Sub / NATS / RabbitMQ)

tests/dynamic_fixtures/message_handler/kafka_java/Benign.java

@@ -0,0 +1,9 @@
+// Phase 20 (Track M.2) — Kafka Java benign control.
+// `org.springframework.kafka` adapter marker preserved.
+public class Benign {
+    public Benign() {}
+
+    public void onMessage(String body) throws Exception {
+        new ProcessBuilder("echo", body).inheritIO().start().waitFor();
+    }
+}