Refactor JdkSerializationRedisSerializer.

* Annotate deserialize(..) with @Override.
* Cleanup source code.
* Edit Javadoc.

Closes #2610

src/main/java/org/springframework/data/redis/serializer/JdkSerializationRedisSerializer.java

@@ -20,18 +20,23 @@ import org.springframework.core.serializer.DefaultDeserializer;
 import org.springframework.core.serializer.DefaultSerializer;
 import org.springframework.core.serializer.support.DeserializingConverter;
 import org.springframework.core.serializer.support.SerializingConverter;
+import org.springframework.data.redis.util.RedisAssertions;
 import org.springframework.lang.Nullable;
-import org.springframework.util.Assert;
 
 /**
- * Java Serialization Redis serializer. Delegates to the default (Java based) {@link DefaultSerializer serializer} and
- * {@link DefaultDeserializer}. This {@link RedisSerializer serializer} can be constructed with either custom
- * {@link ClassLoader} or own {@link Converter converters}.
+ * Java Serialization {@link RedisSerializer}.
+ * <p>
+ * Delegates to the default (Java-based) {@link DefaultSerializer serializer}
+ * and {@link DefaultDeserializer deserializer}.
+ * <p>
+ * This {@link RedisSerializer serializer} can be constructed with either a custom {@link ClassLoader}
+ * or custom {@link Converter converters}.
  *
  * @author Mark Pollack
  * @author Costin Leau
  * @author Mark Paluch
  * @author Christoph Strobl
+ * @author John Blum
  */
 public class JdkSerializationRedisSerializer implements RedisSerializer<Object> {
 
@@ -39,16 +44,18 @@ public class JdkSerializationRedisSerializer implements RedisSerializer<Object>
 	private final Converter<byte[], Object> deserializer;
 
 	/**
-	 * Creates a new {@link JdkSerializationRedisSerializer} using the default class loader.
+	 * Creates a new {@link JdkSerializationRedisSerializer} using the default {@link ClassLoader}.
 	 */
 	public JdkSerializationRedisSerializer() {
 		this(new SerializingConverter(), new DeserializingConverter());
 	}
 
 	/**
-	 * Creates a new {@link JdkSerializationRedisSerializer} using a {@link ClassLoader}.
+	 * Creates a new {@link JdkSerializationRedisSerializer} with the given {@link ClassLoader} used to
+	 * resolve {@link Class types} during deserialization.
 	 *
-	 * @param classLoader the {@link ClassLoader} to use for deserialization. Can be {@literal null}.
+	 * @param classLoader {@link ClassLoader} used to resolve {@link Class types} for deserialization;
+	 * can be {@literal null}.
 	 * @since 1.7
 	 */
 	public JdkSerializationRedisSerializer(@Nullable ClassLoader classLoader) {
@@ -56,22 +63,25 @@ public class JdkSerializationRedisSerializer implements RedisSerializer<Object>
 	}
 
 	/**
-	 * Creates a new {@link JdkSerializationRedisSerializer} using a {@link Converter converters} to serialize and
-	 * deserialize objects.
+	 * Creates a new {@link JdkSerializationRedisSerializer} using {@link Converter converters} to serialize and
+	 * deserialize {@link Object objects}.
 	 *
-	 * @param serializer must not be {@literal null}
-	 * @param deserializer must not be {@literal null}
+	 * @param serializer {@link Converter} used to serialize an {@link Object} to a byte array;
+	 * must not be {@literal null}.
+	 * @param deserializer {@link Converter} used to deserialize and convert a byte arra into an {@link Object};
+	 * must not be {@literal null}
+	 * @throws IllegalArgumentException if either the given {@code serializer} or {@code deserializer}
+	 * are {@literal null}.
 	 * @since 1.7
 	 */
-	public JdkSerializationRedisSerializer(Converter<Object, byte[]> serializer, Converter<byte[], Object> deserializer) {
+	public JdkSerializationRedisSerializer(Converter<Object, byte[]> serializer,
+			Converter<byte[], Object> deserializer) {
 
-		Assert.notNull(serializer, "Serializer must not be null");
-		Assert.notNull(deserializer, "Deserializer must not be null");
-
-		this.serializer = serializer;
-		this.deserializer = deserializer;
+		this.serializer = RedisAssertions.requireObject(serializer, "Serializer must not be null");
+		this.deserializer = RedisAssertions.requireObject(deserializer, "Deserializer must not be null");
 	}
 
+	@Override
 	public Object deserialize(@Nullable byte[] bytes) {
 
 		if (SerializationUtils.isEmpty(bytes)) {
@@ -80,20 +90,22 @@ public class JdkSerializationRedisSerializer implements RedisSerializer<Object>
 
 		try {
 			return deserializer.convert(bytes);
-		} catch (Exception ex) {
-			throw new SerializationException("Cannot deserialize", ex);
+		} catch (Exception cause) {
+			throw new SerializationException("Cannot deserialize", cause);
 		}
 	}
 
 	@Override
 	public byte[] serialize(@Nullable Object object) {
+
 		if (object == null) {
 			return SerializationUtils.EMPTY_ARRAY;
 		}
+
 		try {
 			return serializer.convert(object);
-		} catch (Exception ex) {
-			throw new SerializationException("Cannot serialize", ex);
+		} catch (Exception cause) {
+			throw new SerializationException("Cannot serialize", cause);
 		}
 	}
 }