Consistently declare Object::equals argument as @Nullable

spring-web/src/main/java/org/springframework/http/DefaultHttpStatusCode.java

@@ -19,6 +19,7 @@ package org.springframework.http;
 import java.io.Serializable;
 
 import org.springframework.lang.NonNull;
+import org.springframework.lang.Nullable;
 
 /**
  * Default implementation of {@link HttpStatusCode}.
@@ -89,7 +90,7 @@ final class DefaultHttpStatusCode
 	}
 
 	@Override
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		return (this == obj) || (obj instanceof HttpStatusCode that && this.value == that.value());
 	}
 

spring-web/src/main/java/org/springframework/http/HttpMethod.java

@@ -170,7 +170,7 @@ public final class HttpMethod implements Comparable<HttpMethod>, Serializable {
 	}
 
 	@Override
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		return (this == obj) || (obj instanceof HttpMethod that && this.name.equals(that.name));
 	}
 

spring-web/src/main/java/org/springframework/web/cors/CorsConfiguration.java

@@ -743,7 +743,7 @@ public class CorsConfiguration {
 		}
 
 		@Override
-		public boolean equals(Object other) {
+		public boolean equals(@Nullable Object other) {
 			if (this == other) {
 				return true;
 			}

spring-web/src/test/java/org/springframework/http/codec/xml/Jaxb2XmlDecoderTests.java

@@ -41,6 +41,7 @@ import org.springframework.http.codec.xml.jaxb.XmlRootElementWithNameAndNamespac
 import org.springframework.http.codec.xml.jaxb.XmlType;
 import org.springframework.http.codec.xml.jaxb.XmlTypeWithName;
 import org.springframework.http.codec.xml.jaxb.XmlTypeWithNameAndNamespace;
+import org.springframework.lang.Nullable;
 import org.springframework.util.MimeType;
 import org.springframework.web.testfixture.xml.Pojo;
 
@@ -308,7 +309,7 @@ public class Jaxb2XmlDecoderTests extends AbstractLeakCheckingTests {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o) {
 				return true;
 			}

spring-web/src/test/java/org/springframework/http/converter/xml/Jaxb2CollectionHttpMessageConverterTests.java

@@ -35,6 +35,7 @@ import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.Resource;
 import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.lang.Nullable;
 import org.springframework.web.testfixture.http.MockHttpInputMessage;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -221,7 +222,7 @@ public class Jaxb2CollectionHttpMessageConverterTests {
 		public String external;
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o) {
 				return true;
 			}
@@ -252,7 +253,7 @@ public class Jaxb2CollectionHttpMessageConverterTests {
 		public String s = "Hello World";
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o) {
 				return true;
 			}

spring-web/src/testFixtures/java/org/springframework/web/testfixture/xml/Pojo.java

@@ -18,6 +18,8 @@ package org.springframework.web.testfixture.xml;
 
 import jakarta.xml.bind.annotation.XmlRootElement;
 
+import org.springframework.lang.Nullable;
+
 /**
  * @author Sebastien Deleuze
  */
@@ -53,7 +55,7 @@ public class Pojo {
 	}
 
 	@Override
-	public boolean equals(Object o) {
+	public boolean equals(@Nullable Object o) {
 		if (this == o) {
 			return true;
 		}