Add test method reflecting the fact that the only type of parameter that is supported by AggregatorAdapter is Collection<?> and not one of the Collection subclasses. This might change in a future version.

spring-integration-core/src/test/java/org/springframework/integration/router/AggregatorAdapterTests.java

@@ -19,6 +19,7 @@ package org.springframework.integration.router;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.List;
 
 import org.junit.Assert;
 import org.junit.Before;
@@ -107,6 +108,11 @@ public class AggregatorAdapterTests {
 		new AggregatorAdapter(simpleAggregator, "notEnoughParameters");
 	}
 
+	@Test(expected=MessagingConfigurationException.class)
+	public void testCollectionSubclassParameterUsingMethodName() {
+		new AggregatorAdapter(simpleAggregator, "collectionSubclassParameter");
+	}
+
 	@Test(expected=MessagingConfigurationException.class)
 	public void testInvalidParameterTypeUsingMethodObject() throws SecurityException, NoSuchMethodException {
 		new AggregatorAdapter(simpleAggregator, simpleAggregator.getClass().getMethod(
@@ -125,6 +131,12 @@ public class AggregatorAdapterTests {
 				"notEnoughParameters", new Class[] {} ));
 	}
 
+	@Test(expected= MessagingConfigurationException.class)
+	public void testCollectionSubclassParameterUsingMethodObject() throws SecurityException, NoSuchMethodException {
+		new AggregatorAdapter(simpleAggregator, simpleAggregator.getClass().getMethod(
+				"collectionSubclassParameter", new Class[] {List.class} ));
+	}
+
 	@Test(expected=IllegalArgumentException.class)
 	public void testNullObject() {
 		new AggregatorAdapter(null, "doesNotMatter");
@@ -222,6 +234,10 @@ public class AggregatorAdapterTests {
 		public Message<?> notEnoughParameters() {
 			return null;
 		}
+
+		public Message<?> collectionSubclassParameter(List<?> l1){
+			return null;
+		}
 	}
 
 }