Lambdas for Remaining Modules JPA -> ZK

Polishing - PR Comments and Closeable Warnings

Eclipse emits bogus warnings with exceptions in lambdas.
Even though the lambda might run on another thread, elipse thinks it could
cause the context to not be closed.

SPR-14854: MessageChannel is now a @FunctionalInterface

* Additional Lambda polishing and some code style fixes

spring-integration-event/src/test/java/org/springframework/integration/event/config/EventOutboundChannelAdapterParserTests.java

@@ -130,6 +130,7 @@ public class EventOutboundChannelAdapterParserTests {
 				new ClassPathXmlApplicationContext("EventOutboundChannelAdapterParserTestsWithPollable-context.xml",
 						EventOutboundChannelAdapterParserTests.class);
 		final CyclicBarrier barrier = new CyclicBarrier(2);
+		@SuppressWarnings("resource")
 		ApplicationListener<?> listener = event -> {
 			Object source = event.getSource();
 			if (source instanceof Message) {