Add Nullable annotation to parameter of overridden equals method.

Closes: #2450
Original pull request: #2451

Author: christophstrobl

src/main/java/org/springframework/data/redis/cache/NoOpCacheStatisticsCollector.java

@@ -18,6 +18,7 @@
 import java.time.Instant;
 import java.util.concurrent.TimeUnit;
 
+import org.springframework.lang.Nullable;
 import org.springframework.util.ObjectUtils;
 
 /**
@@ -112,7 +113,7 @@ public Instant getLastReset() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 
 			if (this == o) {
 				return true;

src/main/java/org/springframework/data/redis/connection/BitFieldSubCommands.java

@@ -147,7 +147,7 @@ public Iterator<BitFieldSubCommand> iterator() {
 	}
 
 	@Override
-	public boolean equals(Object o) {
+	public boolean equals(@Nullable Object o) {
 		if (this == o) {
 			return true;
 		}
@@ -432,7 +432,7 @@ public String toString() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 
 			if (this == o) {
 				return true;
@@ -544,7 +544,7 @@ public String asString() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 
 			if (this == o) {
 				return true;
@@ -592,7 +592,7 @@ public Offset getOffset() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 
 			if (this == o) {
 				return true;
@@ -676,7 +676,7 @@ public long getValue() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o) {
 				return true;
 			}
@@ -827,7 +827,7 @@ public enum Overflow {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 
 			if (this == o) {
 				return true;

src/main/java/org/springframework/data/redis/connection/ClusterCommandExecutor.java

@@ -678,7 +678,7 @@ public int getPosition() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o)
 				return true;
 			if (o == null || getClass() != o.getClass())

src/main/java/org/springframework/data/redis/connection/DefaultStringTuple.java

@@ -20,6 +20,7 @@
 import org.springframework.data.redis.connection.StringRedisConnection.StringTuple;
 import org.springframework.data.redis.connection.zset.DefaultTuple;
 import org.springframework.data.redis.connection.zset.Tuple;
+import org.springframework.lang.Nullable;
 import org.springframework.util.ObjectUtils;
 
 /**
@@ -78,7 +79,7 @@ public String toString() {
 	}
 
 	@Override
-	public boolean equals(Object o) {
+	public boolean equals(@Nullable Object o) {
 		if (this == o)
 			return true;
 		if (o == null || getClass() != o.getClass())

src/main/java/org/springframework/data/redis/connection/ReactiveRedisConnection.java

@@ -366,7 +366,7 @@ public O getOutput() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o)
 				return true;
 			if (o == null || getClass() != o.getClass())

src/main/java/org/springframework/data/redis/connection/ReactiveSubscription.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.data.redis.connection;
 
+import org.springframework.lang.Nullable;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
@@ -186,7 +187,7 @@ public M getMessage() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o)
 				return true;
 			if (o == null || getClass() != o.getClass())
@@ -252,7 +253,7 @@ public P getPattern() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o)
 				return true;
 			if (o == null || getClass() != o.getClass())

src/main/java/org/springframework/data/redis/connection/RedisClusterConfiguration.java

@@ -199,7 +199,7 @@ public void setPassword(RedisPassword password) {
 	}
 
 	@Override
-	public boolean equals(Object o) {
+	public boolean equals(@Nullable Object o) {
 		if (this == o) {
 			return true;
 		}

src/main/java/org/springframework/data/redis/connection/RedisNode.java

@@ -269,7 +269,7 @@ public int hashCode() {
 	}
 
 	@Override
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 
 		if (this == obj) {
 			return true;

src/main/java/org/springframework/data/redis/connection/RedisPassword.java

@@ -144,7 +144,7 @@ public String toString() {
 	}
 
 	@Override
-	public boolean equals(Object o) {
+	public boolean equals(@Nullable Object o) {
 
 		if (this == o)
 			return true;

src/main/java/org/springframework/data/redis/connection/RedisSentinelConfiguration.java

@@ -265,7 +265,7 @@ public RedisPassword getSentinelPassword() {
 	}
 
 	@Override
-	public boolean equals(Object o) {
+	public boolean equals(@Nullable Object o) {
 		if (this == o) {
 			return true;
 		}