[Java] Fixed the Java compilation error caused by PlainTableFactory API change.

Summary: Fixed the Java compilation error caused by PlainTableFactory API change.

Test Plan:
make rocksdbjava
make jdb_bench
cd java;./jdb_bench.sh

Reviewers: sdong, ljin, ankgup87, swapnilghike, zzbennett, rsumbaly, igor

Reviewed By: igor

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D20295

java/rocksjni/table.cc

@@ -17,9 +17,10 @@
 jlong Java_org_rocksdb_PlainTableConfig_newTableFactoryHandle(
     JNIEnv* env, jobject jobj, jint jkey_size, jint jbloom_bits_per_key,
     jdouble jhash_table_ratio, jint jindex_sparseness) {
-  return reinterpret_cast<jlong>(rocksdb::NewPlainTableFactory(
-          static_cast<uint32_t>(jkey_size),
-          static_cast<int>(jbloom_bits_per_key),
-          static_cast<double>(jhash_table_ratio),
-          static_cast<size_t>(jindex_sparseness)));
+  rocksdb::PlainTableOptions options = rocksdb::PlainTableOptions();
+  options.user_key_len = jkey_size;
+  options.bloom_bits_per_key = jbloom_bits_per_key;
+  options.hash_table_ratio = jhash_table_ratio;
+  options.index_sparseness = jindex_sparseness;
+  return reinterpret_cast<jlong>(rocksdb::NewPlainTableFactory(options));
 }