Restore traditional AspectJ behavior through "spring.aop.ajc.ignore=true"

Closes gh-33704

framework-docs/modules/ROOT/pages/appendix.adoc

@@ -23,6 +23,12 @@ The following table lists all currently supported Spring properties.
 |===
 | Name | Description
 
+| `spring.aop.ajc.ignore`
+| Instructs Spring to ignore ajc-compiled aspects for Spring AOP proxying, restoring traditional
+Spring behavior for scenarios where both weaving and AspectJ auto-proxying are enabled. See
+{spring-framework-api}++/aop/aspectj/annotation/AbstractAspectJAdvisorFactory.html#IGNORE_AJC_PROPERTY_NAME++[`AbstractAspectJAdvisorFactory`]
+for details.
+
 | `spring.aot.enabled`
 | Indicates the application should run with AOT generated artifacts. See
 xref:core/aot.adoc[Ahead of Time Optimizations] and 
@@ -32,7 +38,7 @@ for details.
 | `spring.beaninfo.ignore`
 | Instructs Spring to use the `Introspector.IGNORE_ALL_BEANINFO` mode when calling the
 JavaBeans `Introspector`. See
-{spring-framework-api}++/beans/StandardBeanInfoFactory.html#IGNORE_BEANINFO_PROPERTY_NAME++[`CachedIntrospectionResults`]
+{spring-framework-api}++/beans/StandardBeanInfoFactory.html#IGNORE_BEANINFO_PROPERTY_NAME++[`StandardBeanInfoFactory`]
 for details.
 
 | `spring.cache.reactivestreams.ignore`
@@ -49,15 +55,13 @@ for details.
 
 | `spring.context.checkpoint`
 | Property that specifies a common context checkpoint. See
-xref:integration/checkpoint-restore.adoc#_automatic_checkpointrestore_at_startup[Automatic
-checkpoint/restore at startup] and
+xref:integration/checkpoint-restore.adoc#_automatic_checkpointrestore_at_startup[Automatic checkpoint/restore at startup] and
 {spring-framework-api}++/context/support/DefaultLifecycleProcessor.html#CHECKPOINT_PROPERTY_NAME++[`DefaultLifecycleProcessor`]
 for details.
 
 | `spring.context.exit`
 | Property for terminating the JVM when the context reaches a specific phase. See
-xref:integration/checkpoint-restore.adoc#_automatic_checkpointrestore_at_startup[Automatic
-checkpoint/restore at startup] and
+xref:integration/checkpoint-restore.adoc#_automatic_checkpointrestore_at_startup[Automatic checkpoint/restore at startup] and
 {spring-framework-api}++/context/support/DefaultLifecycleProcessor.html#EXIT_PROPERTY_NAME++[`DefaultLifecycleProcessor`]
 for details.
 

spring-aop/src/main/java/org/springframework/aop/aspectj/annotation/AbstractAspectJAdvisorFactory.java

@@ -18,6 +18,7 @@ package org.springframework.aop.aspectj.annotation;
 
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.util.Map;
 import java.util.StringTokenizer;
@@ -37,6 +38,7 @@ import org.aspectj.lang.reflect.PerClauseKind;
 
 import org.springframework.aop.framework.AopConfigException;
 import org.springframework.core.ParameterNameDiscoverer;
+import org.springframework.core.SpringProperties;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.lang.Nullable;
 
@@ -58,6 +60,23 @@ public abstract class AbstractAspectJAdvisorFactory implements AspectJAdvisorFac
 	private static final Class<?>[] ASPECTJ_ANNOTATION_CLASSES = new Class<?>[] {
 			Pointcut.class, Around.class, Before.class, After.class, AfterReturning.class, AfterThrowing.class};
 
+	private static final String AJC_MAGIC = "ajc$";
+
+	/**
+	 * System property that instructs Spring to ignore ajc-compiled aspects
+	 * for Spring AOP proxying, restoring traditional Spring behavior for
+	 * scenarios where both weaving and AspectJ auto-proxying are enabled.
+	 * <p>The default is "false". Consider switching this to "true" if you
+	 * encounter double execution of your aspects in a given build setup.
+	 * Note that we recommend restructuring your AspectJ configuration to
+	 * avoid such double exposure of an AspectJ aspect to begin with.
+	 * @since 6.1.15
+	 */
+	public static final String IGNORE_AJC_PROPERTY_NAME = "spring.aop.ajc.ignore";
+
+	private static final boolean shouldIgnoreAjcCompiledAspects =
+			SpringProperties.getFlag(IGNORE_AJC_PROPERTY_NAME);
+
 
 	/** Logger available to subclasses. */
 	protected final Log logger = LogFactory.getLog(getClass());
@@ -67,7 +86,8 @@ public abstract class AbstractAspectJAdvisorFactory implements AspectJAdvisorFac
 
 	@Override
 	public boolean isAspect(Class<?> clazz) {
-		return (AnnotationUtils.findAnnotation(clazz, Aspect.class) != null);
+		return (AnnotationUtils.findAnnotation(clazz, Aspect.class) != null &&
+				(!shouldIgnoreAjcCompiledAspects || !compiledByAjc(clazz)));
 	}
 
 	@Override
@@ -114,6 +134,16 @@ public abstract class AbstractAspectJAdvisorFactory implements AspectJAdvisorFac
 		}
 	}
 
+	private static boolean compiledByAjc(Class<?> clazz) {
+		for (Field field : clazz.getDeclaredFields()) {
+			System.out.println(clazz + ": " + field.getName());
+			if (field.getName().startsWith(AJC_MAGIC)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
 
 	/**
 	 * Enum for AspectJ annotation types.