Added null check for EndpointExecutor 'getActiveCount()' and adjusted MessageSelector definition for generic Message.

spring-integration-core/src/main/java/org/springframework/integration/bus/EndpointExecutor.java

@@ -127,6 +127,9 @@ public class EndpointExecutor implements Lifecycle {
 	}
 
 	public int getActiveCount() {
+		if (this.threadPoolExecutor == null) {
+			return 0;
+		}
 		return this.threadPoolExecutor.getActiveCount();
 	}
 

spring-integration-core/src/main/java/org/springframework/integration/message/MessageSelector.java

@@ -23,6 +23,6 @@ package org.springframework.integration.message;
  */
 public interface MessageSelector {
 
-	boolean accept(Message message);
+	boolean accept(Message<?> message);
 
 }