Add doc

java/org/rocksdb/Iterator.java

@@ -109,8 +109,9 @@ public class Iterator {
    * If an error has occurred, return it.  Else return an ok status.
    * If non-blocking IO is requested and this operation cannot be
    * satisfied without doing some IO, then this returns Status::Incomplete().
+   *
    */
-  public void status(){
+  public void status() throws RocksDBException {
     assert(isInitialized());
     status0(nativeHandle_);
   }

java/org/rocksdb/RocksDB.java

@@ -143,6 +143,8 @@ public class RocksDB {
    *
    * Caller should close the iterator when it is no longer needed.
    * The returned iterator should be closed before this db is closed.
+   *
+   * @return instance of iterator object.
    */
   public Iterator newIterator() {
     return new Iterator(iterator0(nativeHandle_));

java/rocksjni/portal.h

@@ -224,7 +224,7 @@ class IteratorJni {
   }
 
   // Get the field id of the member variable of org.rocksdb.Iterator
-  // that stores the pointer to rocksdb::Iterator
+  // that stores the pointer to rocksdb::Iterator.
   static jfieldID getHandleFieldID(JNIEnv* env) {
     static jfieldID fid = env->GetFieldID(
         getJClass(env), "nativeHandle_", "J");
@@ -232,7 +232,7 @@ class IteratorJni {
     return fid;
   }
 
-  // Get the pointer to rocksdb::Iterator
+  // Get the pointer to rocksdb::Iterator.
   static rocksdb::Iterator* getHandle(JNIEnv* env, jobject jobj) {
     return reinterpret_cast<rocksdb::Iterator*>(
         env->GetLongField(jobj, getHandleFieldID(env)));

java/rocksjni/rocksjni.cc

@@ -297,6 +297,11 @@ void Java_org_rocksdb_RocksDB_close0(
   rocksdb::RocksDBJni::setHandle(env, java_db, nullptr);
 }
 
+/*
+ * Class:     org_rocksdb_RocksDB
+ * Method:    iterator0
+ * Signature: (J)J
+ */
 jlong Java_org_rocksdb_RocksDB_iterator0(
     JNIEnv* env, jobject jdb, jlong db_handle) {
   auto db = reinterpret_cast<rocksdb::DB*>(db_handle);