Add more support with Spring for Apache Kafka

Closes gh-921

Author: artembilan

samples/kafka/src/main/java/com/example/kafka/KafkaApplication.java

@@ -10,7 +10,12 @@
 import org.springframework.kafka.config.TopicBuilder;
 import org.springframework.kafka.core.ConsumerFactory;
 import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.nativex.hint.TypeHint;
 
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+@TypeHint(types = KafkaApplication.Greeting.class)
 @SpringBootApplication
 public class KafkaApplication {
 
@@ -19,8 +24,8 @@ public static void main(String[] args) {
 	}
 
 	@KafkaListener(id = "graal", topics = "graal")
-	public void listen(String in) {
-		System.out.println("++++++Received:" + in);
+	public void listen(Greeting in) {
+		System.out.println("++++++Received: " + in);
 	}
 
 	@Bean
@@ -29,15 +34,39 @@ public NewTopic topic() {
 	}
 
 	@Bean
-	public ApplicationRunner runner(KafkaTemplate<String, String> template,
-				ConsumerFactory<String, String> cf) {
+	public ApplicationRunner runner(KafkaTemplate<String, Greeting> template,
+			ConsumerFactory<String, Greeting> cf) {
+
+		cf.addListener(new ConsumerFactory.Listener<String, Greeting>() {
 
-		cf.addListener(new ConsumerFactory.Listener() { });
+		});
 		return args -> {
-			template.send("graal", "foo");
-			System.out.println("++++++Sent:foo");
+			Greeting data = new Greeting("Hello from GraalVM!");
+			template.send("graal", data);
+			System.out.println("++++++Sent: " + data);
 			Thread.sleep(5000);
 		};
 	}
 
+	public static class Greeting {
+
+		private final String message;
+
+		@JsonCreator
+		public Greeting(@JsonProperty("message") String message) {
+			this.message = message;
+		}
+
+		public String getMessage() {
+			return this.message;
+		}
+
+		@Override public String toString() {
+			return "Greeting{" +
+					"message='" + this.message + '\'' +
+					'}';
+		}
+
+	}
+
 }

samples/kafka/src/main/resources/application.properties

@@ -1 +1,4 @@
 spring.kafka.consumer.auto-offset-reset=earliest
+spring.kafka.consumer.value-deserializer=org.springframework.kafka.support.serializer.JsonDeserializer
+spring.kafka.consumer.properties[spring.json.trusted.packages]=com.example.kafka
+spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer

samples/kafka/verify.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 sleep 2
-if [[ `cat target/native/test-output.txt | grep "++++++Received:foo"` ]]; then
+if [[ `cat target/native/test-output.txt | grep "++++++Received: Greeting{message='Hello from GraalVM!'}"` ]]; then
 	exit 0
 else
 	exit 1

spring-native-configuration/src/main/java/org/springframework/kafka/annotation/KafkaHints.java

@@ -53,8 +53,11 @@
 import org.springframework.kafka.listener.ContainerProperties;
 import org.springframework.kafka.support.LoggingProducerListener;
 import org.springframework.kafka.support.ProducerListener;
+import org.springframework.kafka.support.serializer.JsonDeserializer;
 import org.springframework.kafka.support.serializer.JsonSerializer;
 import org.springframework.nativex.hint.AccessBits;
+import org.springframework.nativex.hint.InitializationHint;
+import org.springframework.nativex.hint.InitializationTime;
 import org.springframework.nativex.hint.NativeHint;
 import org.springframework.nativex.hint.JdkProxyHint;
 import org.springframework.nativex.hint.TypeHint;
@@ -118,6 +121,7 @@
 				DefaultPartitioner.class,
 				StringDeserializer.class,
 				StringSerializer.class,
+				JsonDeserializer.class,
 				JsonSerializer.class,
 				ByteArrayDeserializer.class,
 				ByteArraySerializer.class
@@ -173,5 +177,13 @@
 		})
 	}
 )
+@NativeHint(trigger = org.springframework.kafka.support.KafkaUtils.class,
+		initialization =
+		@InitializationHint(initTime = InitializationTime.BUILD,
+				types = {
+				org.springframework.kafka.support.JacksonUtils.class,
+						org.springframework.kafka.support.KafkaUtils.class,
+						org.springframework.kafka.support.JacksonPresent.class
+		}))
 public class KafkaHints implements NativeConfiguration {
 }