Add Nullable annotation to parameter of overridden equals method.

Closes: #2450
Original pull request: #2451

src/test/java/org/springframework/data/redis/Address.java

@@ -17,6 +17,8 @@ package org.springframework.data.redis;
 
 import java.io.Serializable;
 
+import org.springframework.lang.Nullable;
+
 /**
  * Simple serializable class.
  *
@@ -84,7 +86,7 @@ public class Address implements Serializable {
 		return result;
 	}
 
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		if (this == obj)
 			return true;
 		if (obj == null)

src/test/java/org/springframework/data/redis/Person.java

@@ -17,6 +17,8 @@ package org.springframework.data.redis;
 
 import java.io.Serializable;
 
+import org.springframework.lang.Nullable;
+
 /**
  * Simple serializable class.
  *
@@ -89,7 +91,7 @@ public class Person implements Serializable {
 		return result;
 	}
 
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		if (this == obj)
 			return true;
 		if (obj == null)

src/test/java/org/springframework/data/redis/core/RedisKeyValueTemplateTests.java

@@ -44,6 +44,7 @@ import org.springframework.data.redis.core.mapping.RedisMappingContext;
 import org.springframework.data.redis.test.extension.RedisStanalone;
 import org.springframework.data.redis.test.extension.parametrized.MethodSource;
 import org.springframework.data.redis.test.extension.parametrized.ParameterizedRedisTest;
+import org.springframework.lang.Nullable;
 import org.springframework.util.ObjectUtils;
 
 /**
@@ -880,7 +881,7 @@ public class RedisKeyValueTemplateTests {
 		}
 
 		@Override
-		public boolean equals(Object obj) {
+		public boolean equals(@Nullable Object obj) {
 			if (this == obj) {
 				return true;
 			}

src/test/java/org/springframework/data/redis/repository/cdi/Person.java

@@ -18,6 +18,7 @@ package org.springframework.data.redis.repository.cdi;
 import org.springframework.data.annotation.Id;
 import org.springframework.data.redis.core.RedisHash;
 import org.springframework.data.redis.core.index.Indexed;
+import org.springframework.lang.Nullable;
 
 /**
  * @author Mark Paluch
@@ -46,7 +47,7 @@ class Person {
 	}
 
 	@Override
-	public boolean equals(Object o) {
+	public boolean equals(@Nullable Object o) {
 		if (this == o)
 			return true;
 		if (!(o instanceof Person))

src/test/java/org/springframework/data/redis/serializer/GenericJackson2JsonRedisSerializerUnitTests.java

@@ -49,6 +49,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.ObjectMapper.DefaultTyping;
 import com.fasterxml.jackson.databind.jsontype.TypeResolverBuilder;
 import com.fasterxml.jackson.databind.type.TypeFactory;
+import org.springframework.lang.Nullable;
 
 /**
  * Unit tests for {@link GenericJackson2JsonRedisSerializer}.
@@ -441,7 +442,7 @@ class GenericJackson2JsonRedisSerializerUnitTests {
 		}
 
 		@Override
-		public boolean equals(Object obj) {
+		public boolean equals(@Nullable Object obj) {
 			if (this == obj) {
 				return true;
 			}
@@ -480,7 +481,7 @@ class GenericJackson2JsonRedisSerializerUnitTests {
 		}
 
 		@Override
-		public boolean equals(Object obj) {
+		public boolean equals(@Nullable Object obj) {
 
 			if (this == obj) {
 				return true;