Updated docs and comments to reflect as Optional.absent

README.md

@@ -91,7 +91,7 @@ releaseLock() or lockItem.close()
 
 ### Acquire lock with timeout
 You can acquire a lock via two different methods: acquireLock or tryAcquireLock. The difference between the
-two methods is that tryAcquireLock will return Optional.absent() if the lock was not acquired, whereas
+two methods is that tryAcquireLock will return Optional.empty() if the lock was not acquired, whereas
 acquireLock will throw a LockNotGrantedException. Both methods provide optional parameters where you can specify
 an additional timeout for acquiring the lock. Then they will try to acquire the lock for that amount of time
 before giving up. They do this by continually polling DynamoDB according to an interval you set up. Remember that

src/main/java/com/amazonaws/services/dynamodbv2/AcquireLockOptions.java

@@ -409,7 +409,7 @@ Map<String, AttributeValue> getAdditionalAttributes() {
     /**
      * Constructs a SessionMonitor object for LockItem instantiation
      *
-     * @return <code>Optional.absent()</code> if no call to
+     * @return <code>Optional.empty()</code> if no call to
      * {with,set}SessionMonitor was made, else a SessionMonitor object
      * with the desired properties
      */

src/main/java/com/amazonaws/services/dynamodbv2/AmazonDynamoDBLockClient.java

@@ -264,7 +264,7 @@ public AmazonDynamoDBLockClient(final AmazonDynamoDBLockClientOptions amazonDyna
         Objects.requireNonNull(amazonDynamoDBLockClientOptions.getOwnerName(), "Owner name cannot be null");
         Objects.requireNonNull(amazonDynamoDBLockClientOptions.getTimeUnit(), "Time unit cannot be null");
         Objects.requireNonNull(amazonDynamoDBLockClientOptions.getPartitionKeyName(), "Partition Key Name cannot be null");
-        Objects.requireNonNull(amazonDynamoDBLockClientOptions.getSortKeyName(), "Sort Key Name cannot be null (use Optional.absent())");
+        Objects.requireNonNull(amazonDynamoDBLockClientOptions.getSortKeyName(), "Sort Key Name cannot be null (use Optional.empty())");
         Objects.requireNonNull(amazonDynamoDBLockClientOptions.getNamedThreadCreator(), "Named thread creator cannot be null");
         this.dynamoDB = amazonDynamoDBLockClientOptions.getDynamoDBClient();
         this.tableName = amazonDynamoDBLockClientOptions.getTableName();

src/main/java/com/amazonaws/services/dynamodbv2/AmazonDynamoDBLockClientOptions.java

@@ -272,7 +272,7 @@ String getPartitionKeyName() {
 
     /**
      * @return sortKeyName
-     * The sort key name. If this is set to Optional.absent(), then it means that the table only uses a partition key.
+     * The sort key name. If this is set to Optional.empty(), then it means that the table only uses a partition key.
      */
     Optional<String> getSortKeyName() {
         return this.sortKeyName;

src/main/java/com/amazonaws/services/dynamodbv2/LockItem.java

@@ -58,7 +58,7 @@ public class LockItem implements Closeable {
      * @param client                        The AmazonDynamoDBLockClient object associated with this lock
      * @param partitionKey                  The key representing the lock
      * @param sortKey                       The sort key, if the DynamoDB table supports sort keys (or
-     *                                      Optional.absent otherwise)
+     *                                      Optional.empty otherwise)
      * @param data                          The data stored in the lock (can be null)
      * @param deleteLockItemOnClose         Whether or not to delete the lock item when releasing it
      * @param ownerName                     The owner associated with the lock