Improve Javadoc

java/src/main/java/org/rocksdb/AbstractCompactionFilter.java

@@ -8,7 +8,8 @@ package org.rocksdb;
  * A CompactionFilter allows an application to modify/delete a key-value at
  * the time of compaction.
  *
- * At present we just permit an overriding Java class to wrap a C++ implementation
+ * At present we just permit an overriding Java class to wrap a C++
+ * implementation
  */
 public abstract class AbstractCompactionFilter<T extends AbstractSlice<?>>
     extends RocksObject {
@@ -18,10 +19,10 @@ public abstract class AbstractCompactionFilter<T extends AbstractSlice<?>>
   }
 
   /**
-   * Deletes underlying C++ comparator pointer.
+   * Deletes underlying C++ compaction pointer.
    *
    * Note that this function should be called only after all
-   * RocksDB instances referencing the comparator are closed.
+   * RocksDB instances referencing the compaction filter are closed.
    * Otherwise an undefined behavior will occur.
    */
   @Override

java/src/main/java/org/rocksdb/BackupEngine.java

@@ -30,6 +30,7 @@ public class BackupEngine extends RocksObject implements AutoCloseable {
    * @param options Any options for the backup engine
    *
    * @return A new BackupEngine instance
+   * @throws RocksDBException thrown if the backup engine could not be opened
    */
   public static BackupEngine open(final Env env,
       final BackupableDBOptions options) throws RocksDBException {
@@ -45,6 +46,8 @@ public class BackupEngine extends RocksObject implements AutoCloseable {
    * @param db The database to backup
    *
    * Note - This method is not thread safe
+   *
+   * @throws RocksDBException thrown if a new backup could not be created
    */
   public void createNewBackup(final RocksDB db) throws RocksDBException {
     createNewBackup(db, false);
@@ -68,6 +71,8 @@ public class BackupEngine extends RocksObject implements AutoCloseable {
    *                          parameter.
    *
    * Note - This method is not thread safe
+   *
+   * @throws RocksDBException thrown if a new backup could not be created
    */
   public void createNewBackup(
       final RocksDB db, final boolean flushBeforeBackup)
@@ -116,6 +121,8 @@ public class BackupEngine extends RocksObject implements AutoCloseable {
    * Deletes old backups, keeping just the latest numBackupsToKeep
    *
    * @param numBackupsToKeep The latest n backups to keep
+   *
+   * @throws RocksDBException thrown if the old backups could not be deleted
    */
   public void purgeOldBackups(
       final int numBackupsToKeep) throws RocksDBException {
@@ -127,6 +134,8 @@ public class BackupEngine extends RocksObject implements AutoCloseable {
    * Deletes a backup
    *
    * @param backupId The id of the backup to delete
+   *
+   * @throws RocksDBException thrown if the backup could not be deleted
    */
   public void deleteBackup(final int backupId) throws RocksDBException {
     assert (isOwningHandle());
@@ -152,6 +161,8 @@ public class BackupEngine extends RocksObject implements AutoCloseable {
    * @param walDir The location of the log files for your database,
    *               often the same as dbDir
    * @param restoreOptions Options for controlling the restore
+   *
+   * @throws RocksDBException thrown if the database could not be restored
    */
   public void restoreDbFromBackup(
       final int backupId, final String dbDir, final String walDir,
@@ -167,6 +178,8 @@ public class BackupEngine extends RocksObject implements AutoCloseable {
    * @param dbDir The directory to restore the backup to, i.e. where your database is
    * @param walDir The location of the log files for your database, often the same as dbDir
    * @param restoreOptions Options for controlling the restore
+   *
+   * @throws RocksDBException thrown if the database could not be restored
    */
   public void restoreDbFromLatestBackup(
       final String dbDir, final String walDir,
@@ -178,6 +191,8 @@ public class BackupEngine extends RocksObject implements AutoCloseable {
 
   /**
    * Close the Backup Engine
+   *
+   * @throws RocksDBException thrown if the backup engine could not be closed
    */
   @Override
   public void close() throws RocksDBException {