Move Batch Listener check to start()

- SI adds the listener after Spring has called APS

Author: garyrussell

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/listener/SimpleMessageListenerContainer.java

@@ -525,9 +525,6 @@ protected final boolean sharedConnectionEnabled() {
 
 	@Override
 	protected void doInitialize() {
-		Assert.state(!this.consumerBatchEnabled || getMessageListener() instanceof BatchMessageListener
-				|| getMessageListener() instanceof ChannelAwareBatchMessageListener,
-				"When setting 'consumerBatchEnabled' to true, the listener must support batching");
 		Assert.state(!this.consumerBatchEnabled  || isDeBatchingEnabled(),
 				"When setting 'consumerBatchEnabled' to true, 'deBatchingEnabled' must also be true");
 	}
@@ -543,6 +540,9 @@ public int getActiveConsumerCount() {
 	 */
 	@Override
 	protected void doStart() {
+		Assert.state(!this.consumerBatchEnabled || getMessageListener() instanceof BatchMessageListener
+				|| getMessageListener() instanceof ChannelAwareBatchMessageListener,
+				"When setting 'consumerBatchEnabled' to true, the listener must support batching");
 		checkListenerContainerAware();
 		super.doStart();
 		synchronized (this.consumersMonitor) {