Consistently declare Object::equals argument as @Nullable

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

@@ -117,7 +117,7 @@ public class TypePatternClassFilter implements ClassFilter {
 	}
 
 	@Override
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		return (this == obj || (obj instanceof TypePatternClassFilter that &&
 				ObjectUtils.nullSafeEquals(this.typePattern, that.typePattern)));
 	}

spring-aop/src/main/java/org/springframework/aop/support/RootClassFilter.java

@@ -19,6 +19,7 @@ package org.springframework.aop.support;
 import java.io.Serializable;
 
 import org.springframework.aop.ClassFilter;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -45,7 +46,7 @@ public class RootClassFilter implements ClassFilter, Serializable {
 	}
 
 	@Override
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		return (this == obj || (obj instanceof RootClassFilter that &&
 				this.clazz.equals(that.clazz)));
 	}

spring-aop/src/main/java/org/springframework/aop/support/annotation/AnnotationMatchingPointcut.java

@@ -183,7 +183,7 @@ public class AnnotationMatchingPointcut implements Pointcut {
 		}
 
 		@Override
-		public boolean equals(Object obj) {
+		public boolean equals(@Nullable Object obj) {
 			if (this == obj) {
 				return true;
 			}