GH-2246: Partition attribute SpEL expression

Fixes: gh-2246

When partition attribute is specified as a SpEL expression on PartitionOffset
annotation, it doesn not resolve the value from the expression. Fixing this issue.

Adding test to verify.

**Cherry-pick to 3.0.x**

Author: tsalso

spring-kafka/src/main/java/org/springframework/kafka/annotation/KafkaListenerAnnotationBeanPostProcessor.java

@@ -867,7 +867,7 @@ private List<TopicPartitionOffset> resolveTopicPartitionsList(TopicPartition top
 		for (String partition : partitions) {
 			resolvePartitionAsInteger((String) topic, resolveExpression(partition), result, null, false, false);
 		}
-		if (partitionOffsets.length == 1 && partitionOffsets[0].partition().equals("*")) {
+		if (partitionOffsets.length == 1 && resolveExpression(partitionOffsets[0].partition()).equals("*")) {
 			result.forEach(tpo -> {
 				tpo.setOffset(resolveInitialOffset(tpo.getTopic(), partitionOffsets[0]));
 				tpo.setRelativeToCurrent(isRelative(tpo.getTopic(), partitionOffsets[0]));

spring-kafka/src/test/java/org/springframework/kafka/annotation/EnableKafkaIntegrationTests.java

@@ -175,10 +175,11 @@
  * @author Venil Noronha
  * @author Dimitri Penner
  * @author Nakul Mishra
+ * @author Soby Chacko
  */
 @SpringJUnitConfig
 @DirtiesContext
-@EmbeddedKafka(topics = { "annotated1", "annotated2", "annotated3",
+@EmbeddedKafka(topics = { "annotated1", "annotated2", "annotated3", "annotated3x",
 		"annotated4", "annotated5", "annotated6", "annotated7", "annotated8", "annotated8reply",
 		"annotated9", "annotated10",
 		"annotated11", "annotated12", "annotated13", "annotated14", "annotated15", "annotated16", "annotated17",
@@ -311,6 +312,10 @@ public void manyTests() throws Exception {
 		assertThat(this.listener.capturedRecord.value()).isEqualTo("foo");
 		assertThat(this.config.listen3Exception).isNotNull();
 
+		template.send("annotated3x", 0, "foo");
+		assertThat(this.listener.latch3x.await(60, TimeUnit.SECONDS)).isTrue();
+		assertThat(this.listener.capturedRecord.value()).isEqualTo("foo");
+
 		template.send("annotated4", 0, "foo");
 		assertThat(this.listener.latch4.await(60, TimeUnit.SECONDS)).isTrue();
 		assertThat(this.listener.capturedRecord.value()).isEqualTo("foo");
@@ -1832,6 +1837,8 @@ static class Listener implements ConsumerSeekAware {
 
 		final CountDownLatch latch3 = new CountDownLatch(1);
 
+		final CountDownLatch latch3x = new CountDownLatch(1);
+
 		final CountDownLatch latch4 = new CountDownLatch(1);
 
 		final CountDownLatch latch5 = new CountDownLatch(1);
@@ -2010,6 +2017,14 @@ public void listen3(ConsumerRecord<?, ?> record) {
 			this.latch3.countDown();
 		}
 
+		@KafkaListener(id = "partitionExpression", topicPartitions = @TopicPartition(topic = "${topicThree:annotated3x}",
+				partitions = "${zero:0}",
+				partitionOffsets = @PartitionOffset(partition = "#{'*'}", initialOffset = "0")))
+		public void listenPartitionSpelExpression(ConsumerRecord<?, ?> record) {
+			this.capturedRecord = record;
+			this.latch3x.countDown();
+		}
+
 		@KafkaListener(id = "#{'qux'}", topics = "annotated4",
 				containerFactory = "kafkaManualAckListenerContainerFactory", containerGroup = "qux#{'Group'}",
 				properties = {