Adding support for Windows JNI build

CMakeLists.txt

@@ -13,8 +13,8 @@
 #        cd build
 # 3. Run cmake to generate project files for Windows, add more options to enable required third-party libraries.
 #    See thirdparty.inc for more information.
-#        sample command: cmake -G "Visual Studio 12 Win64" -DGFLAGS=1 -DSNAPPY=1 -DJEMALLOC=1 ..
+#        sample command: cmake -G "Visual Studio 12 Win64" -DGFLAGS=1 -DSNAPPY=1 -DJEMALLOC=1 -DJNI=1 ..
-#        OR for VS Studio 15 cmake -G "Visual Studio 14 Win64" -DGFLAGS=1 -DSNAPPY=1 -DJEMALLOC=1 ..
+#        OR for VS Studio 15 cmake -G "Visual Studio 14 Win64" -DGFLAGS=1 -DSNAPPY=1 -DJEMALLOC=1 -DJNI=1 ..
 # 4. Then build the project in debug mode (you may want to add /m[:<N>] flag to run msbuild in <N> parallel threads
 #                                          or simply /m ot use all avail cores)
 #        msbuild rocksdb.sln
@@ -243,6 +243,7 @@ set(SOURCES
         util/xxhash.cc
         utilities/backupable/backupable_db.cc
         utilities/checkpoint/checkpoint.cc
+        utilities/compaction_filters/remove_emptyvalue_compactionfilter.cc
         utilities/document/document_db.cc
         utilities/document/json_document.cc
         utilities/document/json_document_builder.cc
@@ -288,6 +289,17 @@ set_target_properties(rocksdb${ARTIFACT_SUFFIX} PROPERTIES COMPILE_FLAGS "-DROCK
 add_dependencies(rocksdb${ARTIFACT_SUFFIX} GenerateBuildVersion)
 target_link_libraries(rocksdb${ARTIFACT_SUFFIX} ${LIBS})
 
+if (DEFINED JNI)
+  if (${JNI} EQUAL 1)
+    message(STATUS "JNI library is enabled")
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/java)
+  else()
+    message(STATUS "JNI library is disabled")
+  endif()
+else()
+  message(STATUS "JNI library is disabled")
+endif()
+
 set(APPS
         db/db_bench.cc
         db/memtablerep_bench.cc

java/CMakeLists.txt

@@ -0,0 +1,155 @@
+set(JNI_NATIVE_SOURCES
+        rocksjni/backupenginejni.cc
+        rocksjni/backupablejni.cc
+        rocksjni/checkpoint.cc
+        rocksjni/columnfamilyhandle.cc
+        rocksjni/compaction_filter.cc
+        rocksjni/comparator.cc
+        rocksjni/comparatorjnicallback.cc
+        rocksjni/env.cc
+        rocksjni/filter.cc
+        rocksjni/iterator.cc
+        rocksjni/loggerjnicallback.cc
+        rocksjni/memtablejni.cc
+        rocksjni/merge_operator.cc
+        rocksjni/options.cc
+        rocksjni/ratelimiterjni.cc
+        rocksjni/remove_emptyvalue_compactionfilterjni.cc
+        rocksjni/restorejni.cc
+        rocksjni/rocksjni.cc
+        rocksjni/slice.cc
+        rocksjni/snapshot.cc
+        rocksjni/statistics.cc
+        rocksjni/table.cc
+        rocksjni/transaction_log.cc
+        rocksjni/ttl.cc
+        rocksjni/write_batch.cc
+        rocksjni/writebatchhandlerjnicallback.cc
+        rocksjni/write_batch_with_index.cc
+        rocksjni/write_batch_test.cc
+)
+
+set(NATIVE_JAVA_CLASSES
+        org.rocksdb.AbstractCompactionFilter
+        org.rocksdb.AbstractComparator
+        org.rocksdb.AbstractSlice
+        org.rocksdb.BackupEngine
+        org.rocksdb.BackupableDB
+        org.rocksdb.BackupableDBOptions
+        org.rocksdb.BlockBasedTableConfig
+        org.rocksdb.BloomFilter
+        org.rocksdb.Checkpoint
+        org.rocksdb.ColumnFamilyHandle
+        org.rocksdb.ColumnFamilyOptions
+        org.rocksdb.Comparator
+        org.rocksdb.ComparatorOptions
+        org.rocksdb.DBOptions
+        org.rocksdb.DirectComparator
+        org.rocksdb.DirectSlice
+        org.rocksdb.Env
+        org.rocksdb.FlushOptions
+        org.rocksdb.Filter
+        org.rocksdb.GenericRateLimiterConfig
+        org.rocksdb.HashLinkedListMemTableConfig
+        org.rocksdb.HashSkipListMemTableConfig
+        org.rocksdb.Logger
+        org.rocksdb.MergeOperator
+        org.rocksdb.Options
+        org.rocksdb.PlainTableConfig
+        org.rocksdb.ReadOptions
+        org.rocksdb.RemoveEmptyValueCompactionFilter
+        org.rocksdb.RestoreBackupableDB
+        org.rocksdb.RestoreOptions
+        org.rocksdb.RocksDB
+        org.rocksdb.RocksEnv
+        org.rocksdb.RocksIterator
+        org.rocksdb.RocksMemEnv
+        org.rocksdb.SkipListMemTableConfig
+        org.rocksdb.Slice
+        org.rocksdb.Statistics
+        org.rocksdb.TransactionLogIterator
+        org.rocksdb.TtlDB
+        org.rocksdb.VectorMemTableConfig
+        org.rocksdb.Snapshot
+        org.rocksdb.StringAppendOperator
+        org.rocksdb.WriteBatch
+        org.rocksdb.WriteBatch.Handler
+        org.rocksdb.WriteOptions
+        org.rocksdb.WriteBatchWithIndex
+        org.rocksdb.WBWIRocksIterator
+        org.rocksdb.WriteBatchTest
+        org.rocksdb.WriteBatchTestInternalHelper
+)
+
+include_directories($ENV{JAVA_HOME}/include)
+include_directories($ENV{JAVA_HOME}/include/win32)
+include_directories(${PROJECT_SOURCE_DIR}/java)
+
+set(JAVA_TEST_LIBDIR ${PROJECT_SOURCE_DIR}/java/test-libs)
+set(JAVA_TMP_JAR ${JAVA_TEST_LIBDIR}/tmp.jar)
+set(JAVA_JUNIT_JAR ${JAVA_TEST_LIBDIR}/junit-4.12.jar)
+set(JAVA_HAMCR_JAR ${JAVA_TEST_LIBDIR}/hamcrest-core-1.3.jar)
+set(JAVA_MOCKITO_JAR ${JAVA_TEST_LIBDIR}/mockito-all-1.10.19.jar)
+set(JAVA_CGLIB_JAR ${JAVA_TEST_LIBDIR}/cglib-2.2.2.jar)
+set(JAVA_ASSERTJ_JAR ${JAVA_TEST_LIBDIR}/assertj-core-1.7.1.jar)
+set(JAVA_TESTCLASSPATH "${JAVA_JUNIT_JAR}\;${JAVA_HAMCR_JAR}\;${JAVA_MOCKITO_JAR}\;${JAVA_CGLIB_JAR}\;${JAVA_ASSERTJ_JAR}")
+
+if(NOT EXISTS ${PROJECT_SOURCE_DIR}/java/classes)
+  execute_process(COMMAND mkdir ${PROJECT_SOURCE_DIR}/java/classes)
+endif()
+
+if(NOT EXISTS ${JAVA_TEST_LIBDIR})
+  execute_process(COMMAND mkdir ${JAVA_TEST_LIBDIR})
+endif()
+
+if(NOT EXISTS ${JAVA_JUNIT_JAR})
+  message("Downloading ${JAVA_JUNIT_JAR}")
+  file(DOWNLOAD http://search.maven.org/remotecontent?filepath=junit/junit/4.12/junit-4.12.jar ${JAVA_TMP_JAR} STATUS downloadStatus)
+  list(GET downloadStatus 0 error_code)
+  if(NOT error_code EQUAL 0)
+    message(FATAL_ERROR "Failed downloading ${JAVA_JUNIT_JAR}")
+  endif()
+  file(RENAME ${JAVA_TMP_JAR} ${JAVA_JUNIT_JAR})
+endif()
+if(NOT EXISTS ${JAVA_HAMCR_JAR})
+  message("Downloading ${JAVA_HAMCR_JAR}")
+  file(DOWNLOAD http://search.maven.org/remotecontent?filepath=org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar ${JAVA_TMP_JAR} STATUS downloadStatus)
+  list(GET downloadStatus 0 error_code)
+  if(NOT error_code EQUAL 0)
+    message(FATAL_ERROR "Failed downloading ${JAVA_HAMCR_JAR}")
+  endif()
+  file(RENAME ${JAVA_TMP_JAR} ${JAVA_HAMCR_JAR})
+endif()
+if(NOT EXISTS ${JAVA_MOCKITO_JAR})
+  message("Downloading ${JAVA_MOCKITO_JAR}")
+  file(DOWNLOAD http://search.maven.org/remotecontent?filepath=org/mockito/mockito-all/1.10.19/mockito-all-1.10.19.jar ${JAVA_TMP_JAR} STATUS downloadStatus)
+  list(GET downloadStatus 0 error_code)
+  if(NOT error_code EQUAL 0)
+    message(FATAL_ERROR "Failed downloading ${JAVA_MOCKITO_JAR}")
+  endif()
+  file(RENAME ${JAVA_TMP_JAR} ${JAVA_MOCKITO_JAR})
+endif()
+if(NOT EXISTS ${JAVA_CGLIB_JAR})
+  message("Downloading ${JAVA_CGLIB_JAR}")
+  file(DOWNLOAD http://search.maven.org/remotecontent?filepath=cglib/cglib/2.2.2/cglib-2.2.2.jar ${JAVA_TMP_JAR} STATUS downloadStatus)
+  list(GET downloadStatus 0 error_code)
+  if(NOT error_code EQUAL 0)
+    message(FATAL_ERROR "Failed downloading ${JAVA_CGLIB_JAR}")
+  endif()
+  file(RENAME ${JAVA_TMP_JAR} ${JAVA_CGLIB_JAR})
+endif()
+if(NOT EXISTS ${JAVA_ASSERTJ_JAR})
+  message("Downloading ${JAVA_ASSERTJ_JAR}")
+  file(DOWNLOAD http://central.maven.org/maven2/org/assertj/assertj-core/1.7.1/assertj-core-1.7.1.jar ${JAVA_TMP_JAR} STATUS downloadStatus)
+  list(GET downloadStatus 0 error_code)
+  if(NOT error_code EQUAL 0)
+    message(FATAL_ERROR "Failed downloading ${JAVA_ASSERTJ_JAR}")
+  endif()
+  file(RENAME ${JAVA_TMP_JAR} ${JAVA_ASSERTJ_JAR})
+endif()
+
+execute_process(COMMAND javac -cp ${JAVA_TESTCLASSPATH} -d ${PROJECT_SOURCE_DIR}/java/classes ${PROJECT_SOURCE_DIR}/java/src/main/java/org/rocksdb/util/*.java ${PROJECT_SOURCE_DIR}/java/src/main/java/org/rocksdb/*.java ${PROJECT_SOURCE_DIR}/java/src/test/java/org/rocksdb/*.java)
+execute_process(COMMAND javah -cp ${PROJECT_SOURCE_DIR}/java/classes -d ${PROJECT_SOURCE_DIR}/java/include -jni ${NATIVE_JAVA_CLASSES})
+add_library(rocksdbjni${ARTIFACT_SUFFIX} SHARED ${JNI_NATIVE_SOURCES})
+set_target_properties(rocksdbjni${ARTIFACT_SUFFIX} PROPERTIES COMPILE_FLAGS "/Fd${CMAKE_CFG_INTDIR}/rocksdbjni${ARTIFACT_SUFFIX}.pdb")
+target_link_libraries(rocksdbjni${ARTIFACT_SUFFIX} rocksdblib${ARTIFACT_SUFFIX} ${LIBS})

java/rocksjni/backupablejni.cc

@@ -103,20 +103,14 @@ jintArray Java_org_rocksdb_BackupableDB_getCorruptedBackups(
   reinterpret_cast<rocksdb::BackupableDB*>(jhandle)->
       GetCorruptedBackups(&backup_ids);
   // store backupids in int array
-  const std::vector<rocksdb::BackupID>::size_type
+  std::vector<jint> int_backup_ids(backup_ids.begin(), backup_ids.end());
-      kIdSize = backup_ids.size();
-  int int_backup_ids[kIdSize];
-  for (std::vector<rocksdb::BackupID>::size_type i = 0;
-      i != kIdSize; i++) {
-    int_backup_ids[i] = backup_ids[i];
-  }
   // Store ints in java array
   jintArray ret_backup_ids;
   // Its ok to loose precision here (64->32)
-  jsize ret_backup_ids_size = static_cast<jsize>(kIdSize);
+  jsize ret_backup_ids_size = static_cast<jsize>(backup_ids.size());
   ret_backup_ids = env->NewIntArray(ret_backup_ids_size);
   env->SetIntArrayRegion(ret_backup_ids, 0, ret_backup_ids_size,
-      int_backup_ids);
+    int_backup_ids.data());
   return ret_backup_ids;
 }
 

java/rocksjni/backupenginejni.cc

@@ -81,20 +81,14 @@ jintArray Java_org_rocksdb_BackupEngine_getCorruptedBackups(
   std::vector<rocksdb::BackupID> backup_ids;
   backup_engine->GetCorruptedBackups(&backup_ids);
   // store backupids in int array
-  const std::vector<rocksdb::BackupID>::size_type
+  std::vector<jint> int_backup_ids(backup_ids.begin(), backup_ids.end());
-      kIdSize = backup_ids.size();
-  int int_backup_ids[kIdSize];
-  for (std::vector<rocksdb::BackupID>::size_type i = 0;
-      i != kIdSize; i++) {
-    int_backup_ids[i] = backup_ids[i];
-  }
   // Store ints in java array
   jintArray ret_backup_ids;
   // Its ok to loose precision here (64->32)
-  jsize ret_backup_ids_size = static_cast<jsize>(kIdSize);
+  jsize ret_backup_ids_size = static_cast<jsize>(backup_ids.size());
   ret_backup_ids = env->NewIntArray(ret_backup_ids_size);
   env->SetIntArrayRegion(ret_backup_ids, 0, ret_backup_ids_size,
-      int_backup_ids);
+      int_backup_ids.data());
   return ret_backup_ids;
 }
 

java/rocksjni/options.cc

@@ -8,7 +8,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <jni.h>
-#include <strings.h>
 #include <memory>
 
 #include "include/org_rocksdb_Options.h"
@@ -1180,7 +1179,7 @@ jbyte Java_org_rocksdb_Options_compactionStyle(
 void Java_org_rocksdb_Options_setMaxTableFilesSizeFIFO(
     JNIEnv* env, jobject jobj, jlong jhandle, jlong jmax_table_files_size) {
   reinterpret_cast<rocksdb::Options*>(jhandle)->compaction_options_fifo.max_table_files_size =
-    static_cast<long>(jmax_table_files_size);
+    static_cast<uint64_t>(jmax_table_files_size);
 }
 
 /*
@@ -2339,7 +2338,7 @@ jbyte Java_org_rocksdb_ColumnFamilyOptions_compactionStyle(
 void Java_org_rocksdb_ColumnFamilyOptions_setMaxTableFilesSizeFIFO(
     JNIEnv* env, jobject jobj, jlong jhandle, jlong jmax_table_files_size) {
   reinterpret_cast<rocksdb::ColumnFamilyOptions*>(jhandle)->compaction_options_fifo.max_table_files_size =
-    static_cast<long>(jmax_table_files_size);
+    static_cast<uint64_t>(jmax_table_files_size);
 }
 
 /*

java/rocksjni/portal.h

@@ -24,6 +24,11 @@
 #include "rocksjni/loggerjnicallback.h"
 #include "rocksjni/writebatchhandlerjnicallback.h"
 
+// Remove macro on windows
+#ifdef DELETE
+#undef DELETE
+#endif
+
 namespace rocksdb {
 
 // Detect if jlong overflows size_t

java/rocksjni/restorejni.cc

@@ -156,21 +156,14 @@ jintArray Java_org_rocksdb_RestoreBackupableDB_getCorruptedBackups(
   reinterpret_cast<rocksdb::RestoreBackupableDB*>(jhandle)->
       GetCorruptedBackups(&backup_ids);
   // store backupids in int array
-  const std::vector<rocksdb::BackupID>::size_type
+  std::vector<jint> int_backup_ids(backup_ids.begin(), backup_ids.end());
-        kIdSize = backup_ids.size();
-
-  int int_backup_ids[kIdSize];
-  for (std::vector<rocksdb::BackupID>::size_type i = 0;
-      i != kIdSize; i++) {
-    int_backup_ids[i] = backup_ids[i];
-  }
   // Store ints in java array
   jintArray ret_backup_ids;
   // Its ok to loose precision here (64->32)
-  jsize ret_backup_ids_size = static_cast<jsize>(kIdSize);
+  jsize ret_backup_ids_size = static_cast<jsize>(backup_ids.size());
   ret_backup_ids = env->NewIntArray(ret_backup_ids_size);
   env->SetIntArrayRegion(ret_backup_ids, 0, ret_backup_ids_size,
-      int_backup_ids);
+      int_backup_ids.data());
   return ret_backup_ids;
 }
 

java/rocksjni/rocksjni.cc

@@ -12,6 +12,7 @@
 #include <memory>
 #include <string>
 #include <vector>
+#include <algorithm>
 
 #include "include/org_rocksdb_RocksDB.h"
 #include "rocksdb/db.h"
@@ -19,6 +20,10 @@
 #include "rocksdb/types.h"
 #include "rocksjni/portal.h"
 
+#ifdef min
+#undef min
+#endif
+
 //////////////////////////////////////////////////////////////////////////////
 // rocksdb::DB::Open
 
@@ -688,8 +693,8 @@ jint rocksdb_get_helper(
     return kStatusError;
   }
 
-  int cvalue_len = static_cast<int>(cvalue.size());
+  jint cvalue_len = static_cast<jint>(cvalue.size());
-  int length = std::min(jentry_value_len, cvalue_len);
+  jint length = std::min(jentry_value_len, cvalue_len);
 
   env->SetByteArrayRegion(
       jentry_value, 0, length,

java/rocksjni/statistics.cc

@@ -20,7 +20,7 @@
  * Signature: (IJ)J
  */
 jlong Java_org_rocksdb_Statistics_getTickerCount0(
-    JNIEnv* env, jobject jobj, int tickerType, jlong handle) {
+    JNIEnv* env, jobject jobj, jint tickerType, jlong handle) {
   auto st = reinterpret_cast<rocksdb::Statistics*>(handle);
   assert(st != nullptr);
 
@@ -33,7 +33,7 @@ jlong Java_org_rocksdb_Statistics_getTickerCount0(
  * Signature: (IJ)Lorg/rocksdb/HistogramData;
  */
 jobject Java_org_rocksdb_Statistics_geHistogramData0(
-  JNIEnv* env, jobject jobj, int histogramType, jlong handle) {
+    JNIEnv* env, jobject jobj, jint histogramType, jlong handle) {
   auto st = reinterpret_cast<rocksdb::Statistics*>(handle);
   assert(st != nullptr);
 

java/src/main/java/org/rocksdb/NativeLibraryLoader.java

@@ -19,7 +19,7 @@ public class NativeLibraryLoader {
   private static final String jniLibraryName = Environment.getJniLibraryName("rocksdb");
   private static final String jniLibraryFileName = Environment.getJniLibraryFileName("rocksdb");
   private static final String tempFilePrefix = "librocksdbjni";
-  private static final String tempFileSuffix = "." + Environment.getJniLibraryExtension();
+  private static final String tempFileSuffix = Environment.getJniLibraryExtension();
 
   /**
    * Get a reference to the NativeLibraryLoader
@@ -75,37 +75,43 @@ public class NativeLibraryLoader {
   void loadLibraryFromJar(final String tmpDir)
       throws IOException {
     if (!initialized) {
-      final File temp;
+      System.load(loadLibraryFromJarToTemp(tmpDir).getAbsolutePath());
-      if (tmpDir == null || tmpDir.equals("")) {
-        temp = File.createTempFile(tempFilePrefix, tempFileSuffix);
-      } else {
-        temp = new File(tmpDir, jniLibraryFileName);
-        if (!temp.createNewFile()) {
-          throw new RuntimeException("File: " + temp.getAbsolutePath()
-              + " could not be created.");
-        }
-      }
-
-      if (!temp.exists()) {
-        throw new RuntimeException("File " + temp.getAbsolutePath() + " does not exist.");
-      } else {
-        temp.deleteOnExit();
-      }
-
-      // attempt to copy the library from the Jar file to the temp destination
-      try (final InputStream is = getClass().getClassLoader().
-          getResourceAsStream(jniLibraryFileName)) {
-        if (is == null) {
-          throw new RuntimeException(jniLibraryFileName + " was not found inside JAR.");
-        } else {
-          Files.copy(is, temp.toPath(), StandardCopyOption.REPLACE_EXISTING);
-        }
-      }
-
-      System.load(temp.getAbsolutePath());
       initialized = true;
     }
   }
+
+  File loadLibraryFromJarToTemp(final String tmpDir)
+          throws IOException {
+    final File temp;
+    if (tmpDir == null || tmpDir.isEmpty()) {
+      temp = File.createTempFile(tempFilePrefix, tempFileSuffix);
+    } else {
+      temp = new File(tmpDir, jniLibraryFileName);
+      if (!temp.createNewFile()) {
+        throw new RuntimeException("File: " + temp.getAbsolutePath()
+            + " could not be created.");
+      }
+    }
+
+    if (!temp.exists()) {
+      throw new RuntimeException("File " + temp.getAbsolutePath() + " does not exist.");
+    } else {
+      temp.deleteOnExit();
+    }
+
+    // attempt to copy the library from the Jar file to the temp destination
+    try (final InputStream is = getClass().getClassLoader().
+      getResourceAsStream(jniLibraryFileName)) {
+      if (is == null) {
+        throw new RuntimeException(jniLibraryFileName + " was not found inside JAR.");
+      } else {
+        Files.copy(is, temp.toPath(), StandardCopyOption.REPLACE_EXISTING);
+      }
+    }
+
+    return temp;
+  }
+
   /**
    * Private constructor to disallow instantiation
    */

java/src/main/java/org/rocksdb/util/Environment.java

@@ -42,7 +42,9 @@ public class Environment {
       return String.format("%sjni-osx", name);
     } else if (isSolaris()) {
       return String.format("%sjni-solaris%d", name, is64Bit() ? 64 : 32);
-    } 
+    } else if (isWindows() && is64Bit()) {
+      return String.format("%sjni-win64", name);
+    }
     throw new UnsupportedOperationException();
   }
 
@@ -55,11 +57,16 @@ public class Environment {
       return libraryFileName + ".so";
     } else if (isMac()) {
       return libraryFileName + (shared ? ".dylib" : ".jnilib");
+    } else if (isWindows()) {
+      return libraryFileName + ".dll";
     }
     throw new UnsupportedOperationException();
   }
 
   public static String getJniLibraryExtension() {
+    if (isWindows()) {
+      return ".dll";
+    }
     return (isMac()) ? ".jnilib" : ".so";
   }
 }

java/src/test/java/org/rocksdb/BackupableDBOptionsTest.java

@@ -5,18 +5,18 @@
 
 package org.rocksdb;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Random;
+
 import org.junit.ClassRule;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
-import java.util.Random;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
 public class BackupableDBOptionsTest {
 
-  private final static String ARBITRARY_PATH = "/tmp";
+  private final static String ARBITRARY_PATH = System.getProperty("java.io.tmpdir");
 
   @ClassRule
   public static final RocksMemoryResource rocksMemoryResource =

java/src/test/java/org/rocksdb/InfoLogLevelTest.java

@@ -4,6 +4,7 @@ import org.junit.ClassRule;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
+import org.rocksdb.util.Environment;
 
 import java.io.IOException;
 
@@ -113,7 +114,7 @@ public class InfoLogLevelTest {
    * @throws IOException if file is not found.
    */
   private String getLogContentsWithoutHeader() throws IOException {
-    final String separator = System.getProperty("line.separator");
+    final String separator = Environment.isWindows() ? "\n" : System.getProperty("line.separator");
     final String[] lines = new String(readAllBytes(get(
         dbFolder.getRoot().getAbsolutePath()+ "/LOG"))).split(separator);
 

java/src/test/java/org/rocksdb/NativeLibraryLoaderTest.java

@@ -21,7 +21,7 @@ public class NativeLibraryLoaderTest {
 
   @Test
   public void tempFolder() throws IOException {
-    NativeLibraryLoader.getInstance().loadLibraryFromJar(
+    NativeLibraryLoader.getInstance().loadLibraryFromJarToTemp(
         temporaryFolder.getRoot().getAbsolutePath());
     Path path = Paths.get(temporaryFolder.getRoot().getAbsolutePath(),
         Environment.getJniLibraryFileName("rocksdb"));

java/src/test/java/org/rocksdb/util/EnvironmentTest.java

@@ -117,16 +117,22 @@ public class EnvironmentTest {
     assertThat(Environment.isWindows()).isTrue();
   }
 
-  @Test(expected = UnsupportedOperationException.class)
+  @Test
-  public void failWinJniLibraryName(){
+  public void win64() {
     setEnvironmentClassFields("win", "x64");
-    Environment.getJniLibraryFileName("rocksdb");
+    assertThat(Environment.isWindows()).isTrue();
+    assertThat(Environment.getJniLibraryExtension()).
+      isEqualTo(".dll");
+    assertThat(Environment.getJniLibraryFileName("rocksdb")).
+      isEqualTo("librocksdbjni-win64.dll");
+    assertThat(Environment.getSharedLibraryFileName("rocksdb")).
+      isEqualTo("librocksdbjni.dll");
   }
 
   @Test(expected = UnsupportedOperationException.class)
-  public void failWinSharedLibrary(){
+  public void win32(){
-    setEnvironmentClassFields("win", "x64");
+    setEnvironmentClassFields("win", "32");
-    Environment.getSharedLibraryFileName("rocksdb");
+    Environment.getJniLibraryFileName("rocksdb");
   }
 
   private void setEnvironmentClassFields(String osName,