avoid hard-coded AOP dependency for ScopedObject check

org.springframework.transaction/src/main/java/org/springframework/transaction/support/TransactionSynchronizationUtils.java

@@ -21,9 +21,10 @@ import java.util.List;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.aop.scope.ScopedObject;
 import org.springframework.core.InfrastructureProxy;
 import org.springframework.util.Assert;
-import org.springframework.aop.scope.ScopedObject;
+import org.springframework.util.ClassUtils;
 
 /**
  * Utility methods for triggering specific {@link TransactionSynchronization}
@@ -38,6 +39,9 @@ public abstract class TransactionSynchronizationUtils {
 
 	private static final Log logger = LogFactory.getLog(TransactionSynchronizationUtils.class);
 
+	private static final boolean aopAvailable = ClassUtils.isPresent(
+			"org.springframework.aop.scope.ScopedObject", TransactionSynchronizationUtils.class.getClassLoader());
+
 
 	/**
 	 * Check whether the given resource transaction managers refers to the given
@@ -57,12 +61,15 @@ public abstract class TransactionSynchronizationUtils {
 	static Object unwrapResourceIfNecessary(Object resource) {
 		Assert.notNull(resource, "Resource must not be null");
 		Object resourceRef = resource;
-		if (resource instanceof ScopedObject) {
-			// First unwrap a scoped proxy.
-			resourceRef = ((ScopedObject) resource).getTargetObject();
+		// unwrap infrastructure proxy
+		if (resourceRef instanceof InfrastructureProxy) {
+			resourceRef = ((InfrastructureProxy) resourceRef).getWrappedObject();
+		}
+		if (aopAvailable) {
+			// now unwrap scoped proxy
+			resourceRef = ScopedProxyUnwrapper.unwrapIfNecessary(resource);
 		}
-		// Now unwrap infrastructure proxy
-		return (resourceRef instanceof InfrastructureProxy ? ((InfrastructureProxy) resourceRef).getWrappedObject() : resourceRef);
+		return resourceRef;
 	}
 
 
@@ -167,4 +174,20 @@ public abstract class TransactionSynchronizationUtils {
 		}
 	}
 
+
+	/**
+	 * Inner class to avoid hard-coded dependency on AOP module.
+	 */
+	private static class ScopedProxyUnwrapper {
+
+		public static Object unwrapIfNecessary(Object resource) {
+			if (resource instanceof ScopedObject) {
+				return ((ScopedObject) resource).getTargetObject();
+			}
+			else {
+				return resource;
+			}
+		}
+	}
+
 }