Fix [cast] compiler warnings

spring-aop/src/main/java/org/springframework/aop/aspectj/AspectJAdviceParameterNameDiscoverer.java

@@ -700,7 +700,7 @@ public class AspectJAdviceParameterNameDiscoverer implements ParameterNameDiscov
 				// 1 primitive arg, and one candidate...
 				for (int i = 0; i < this.argumentTypes.length; i++) {
 					if (isUnbound(i) && this.argumentTypes[i].isPrimitive()) {
-						bindParameterName(i, (String) varNames.get(0));
+						bindParameterName(i, varNames.get(0));
 						break;
 					}
 				}

spring-aop/src/main/java/org/springframework/aop/aspectj/autoproxy/AspectJAwareAdvisorAutoProxyCreator.java

@@ -77,7 +77,7 @@ public class AspectJAwareAdvisorAutoProxyCreator extends AbstractAdvisorAutoProx
 
 		// sort it
 		List<PartiallyComparableAdvisorHolder> sorted =
-				(List<PartiallyComparableAdvisorHolder>) PartialOrder.sort(partiallyComparableAdvisors);
+				PartialOrder.sort(partiallyComparableAdvisors);
 		if (sorted == null) {
 			// TODO: work harder to give a better error message here.
 			throw new IllegalArgumentException("Advice precedence circularity error");