fix java doc issues (#9253)

Summary: Pull Request resolved: #9253

Reviewed By: jay-zhuang

Differential Revision: D32990516

Pulled By: mrambacher

fbshipit-source-id: c7cdb6562ac6871bca6ea0d9efa454f3a902a137

java/src/main/java/org/rocksdb/ColumnFamilyOptionsInterface.java

@@ -14,6 +14,8 @@ public interface ColumnFamilyOptionsInterface<T extends ColumnFamilyOptionsInter
    * The function recovers options to a previous version. Only 4.6 or later
    * versions are supported.
    *
+   * @param majorVersion The major version to recover default values of options
+   * @param minorVersion The minor version to recover default values of options
    * @return the instance of the current object.
    */
   T oldDefaults(int majorVersion, int minorVersion);
@@ -30,8 +32,8 @@ public interface ColumnFamilyOptionsInterface<T extends ColumnFamilyOptionsInter
    * Some functions that make it easier to optimize RocksDB
    * Use this if your DB is very small (like under 1GB) and you don't want to
    * spend lots of memory for memtables.
-   * An optional cache object is passed in to be used as the block cache
    *
+   * @param cache An optional cache object is passed in to be used as the block cache
    * @return the instance of the current object.
    */
   T optimizeForSmallDb(Cache cache);

java/src/main/java/org/rocksdb/EventListener.java

@@ -303,6 +303,8 @@ void onBackgroundError(
    * false, then they won't be called.
    *
    * Default: false
+   *
+   * @return whether to callback when file read/write is finished
    */
   boolean shouldBeNotifiedOnFileIO();
 
@@ -316,6 +318,7 @@ void onBackgroundError(
    *
    * @param backgroundErrorReason background error reason code
    * @param backgroundError background error codes
+   * @return whether to suppress the automatic recovery
    */
   boolean onErrorRecoveryBegin(
       final BackgroundErrorReason backgroundErrorReason, final Status backgroundError);

java/src/main/java/org/rocksdb/SstFileWriter.java

@@ -244,6 +244,7 @@ public void finish() throws RocksDBException {
   /**
    * Return the current file size.
    *
+   * @return the current file size.
    * @throws RocksDBException thrown if error happens in underlying
    *    native library.
    */

java/src/main/java/org/rocksdb/WriteBatchInterface.java

@@ -50,7 +50,7 @@ void put(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value)
      *     Supports direct buffer only.
      * @param value the value associated with the specified key. It is using position and limit.
      *     Supports direct buffer only.
-     * @throws RocksDBException
+     * @throws RocksDBException thrown if error happens in underlying native library.
      */
     void put(final ByteBuffer key, final ByteBuffer value) throws RocksDBException;
 
@@ -64,7 +64,7 @@ void put(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value)
      *     Supports direct buffer only.
      * @param value the value associated with the specified key. It is using position and limit.
      *     Supports direct buffer only.
-     * @throws RocksDBException
+     * @throws RocksDBException thrown if error happens in underlying native library.
      */
     void put(ColumnFamilyHandle columnFamilyHandle, final ByteBuffer key, final ByteBuffer value)
         throws RocksDBException;