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;
 		}

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

@@ -104,7 +104,7 @@ 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/RedisStandaloneConfiguration.java

@@ -129,7 +129,7 @@ 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/RedisStaticMasterReplicaConfiguration.java

@@ -155,7 +155,7 @@ public List<RedisStandaloneConfiguration> getNodes() {
 	}
 
 	@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/RedisStreamCommands.java

@@ -242,7 +242,7 @@ public boolean hasMinId() {
 		}
 
 		@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/RedisZSetCommands.java

@@ -317,7 +317,7 @@ public boolean isEmpty() {
 		}
 
 		@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/SentinelMasterId.java

@@ -16,6 +16,7 @@
 package org.springframework.data.redis.connection;
 
 import org.springframework.lang.NonNull;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 
@@ -46,7 +47,7 @@ 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/lettuce/LettuceConnection.java

@@ -1442,7 +1442,7 @@ public String name() {
 		}
 
 		@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/stream/Consumer.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.data.redis.connection.stream;
 
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 
@@ -64,7 +65,7 @@ public String getName() {
 	}
 
 	@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/stream/ReadOffset.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.data.redis.connection.stream;
 
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 
@@ -81,7 +82,7 @@ public String getOffset() {
 	}
 
 	@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/stream/RecordId.java

@@ -154,7 +154,7 @@ private Long value(int index) {
 	}
 
 	@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/stream/StreamOffset.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.data.redis.connection.stream;
 
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 
@@ -101,7 +102,7 @@ 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/stream/StreamReadOptions.java

@@ -131,7 +131,7 @@ 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/stream/StreamRecords.java

@@ -280,7 +280,7 @@ public String toString() {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 
 			if (o == null) {
 				return false;
@@ -430,7 +430,7 @@ 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/util/ByteArrayWrapper.java

@@ -17,6 +17,8 @@
 
 import java.util.Arrays;
 
+import org.springframework.lang.Nullable;
+
 /**
  * Simple wrapper class used for wrapping arrays so they can be used as keys inside maps.
  *
@@ -32,7 +34,7 @@ public ByteArrayWrapper(byte[] array) {
 		this.hashCode = Arrays.hashCode(array);
 	}
 
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		if (obj instanceof ByteArrayWrapper) {
 			return Arrays.equals(array, ((ByteArrayWrapper) obj).array);
 		}

src/main/java/org/springframework/data/redis/connection/zset/DefaultTuple.java

@@ -17,6 +17,8 @@
 
 import java.util.Arrays;
 
+import org.springframework.lang.Nullable;
+
 /**
  * Default implementation for {@link Tuple} interface.
  *
@@ -48,7 +50,7 @@ public byte[] getValue() {
 		return value;
 	}
 
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		if (this == obj)
 			return true;
 		if (obj == null)

src/main/java/org/springframework/data/redis/connection/zset/Weights.java

@@ -24,6 +24,7 @@
 import java.util.stream.DoubleStream;
 import java.util.stream.IntStream;
 
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 
@@ -144,7 +145,7 @@ public List<Double> toList() {
 	}
 
 	@Override
-	public boolean equals(Object o) {
+	public boolean equals(@Nullable Object o) {
 
 		if (this == o) {
 			return true;

src/main/java/org/springframework/data/redis/core/DefaultTypedTuple.java

@@ -59,7 +59,7 @@ public int hashCode() {
 		return result;
 	}
 
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		if (this == obj)
 			return true;
 		if (obj == null)