diff --git a/lucene/JRE_VERSION_MIGRATION.txt b/lucene/JRE_VERSION_MIGRATION.txt
index 6face9eaa2f..c8404641c08 100644
--- a/lucene/JRE_VERSION_MIGRATION.txt
+++ b/lucene/JRE_VERSION_MIGRATION.txt
@@ -17,7 +17,7 @@ For reference, JRE major versions with their corresponding Unicode versions:
  * Java 6, Unicode 4.0
  * Java 7, Unicode 6.0
  * Java 8, Unicode 6.2
- * Java 9 (not yet released / offcially supported by Lucene), Unicode 7.0
+ * Java 9 (not yet released / offcially supported by Lucene), Unicode 8.0
 
 In general, whether or not you need to re-index largely depends upon the data that
 you are searching, and what was changed in any given Unicode version. For example, 
diff --git a/lucene/test-framework/src/java/org/apache/lucene/store/BaseDirectoryTestCase.java b/lucene/test-framework/src/java/org/apache/lucene/store/BaseDirectoryTestCase.java
index 5f66074718e..44c03ea4b7e 100644
--- a/lucene/test-framework/src/java/org/apache/lucene/store/BaseDirectoryTestCase.java
+++ b/lucene/test-framework/src/java/org/apache/lucene/store/BaseDirectoryTestCase.java
@@ -1213,6 +1213,7 @@ public abstract class BaseDirectoryTestCase extends LuceneTestCase {
           continue;
         }
         try (IndexOutput out = dir.createOutput(candidate, IOContext.DEFAULT)) {
+          out.getFilePointer(); // just fake access to prevent compiler warning
         }
         fsDir.deleteFile(candidate);
         if (fsDir.checkPendingDeletions()) {
@@ -1246,12 +1247,14 @@ public abstract class BaseDirectoryTestCase extends LuceneTestCase {
 
       if (random().nextBoolean()) {
         try (IndexOutput out = fsDir.createOutput(fileName + "z", IOContext.DEFAULT)) {
+          out.getFilePointer(); // just fake access to prevent compiler warning
         }
         // Make sure we can rename onto the deleted file:
         fsDir.renameFile(fileName + "z", fileName);
       } else {
         // write the file again
         try (IndexOutput out = dir.createOutput(fileName, IOContext.DEFAULT)) {
+          out.getFilePointer(); // just fake access to prevent compiler warning
         }
       }
       assertEquals(0, fsDir.fileLength(fileName));
diff --git a/lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java b/lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java
index ef4397f40af..962062e0312 100644
--- a/lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java
+++ b/lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java
@@ -19,7 +19,6 @@ package org.apache.lucene.store;
 import java.io.Closeable;
 import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.nio.file.FileSystem;
 import java.nio.file.NoSuchFileException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -46,8 +45,6 @@ import org.apache.lucene.index.IndexWriter;
 import org.apache.lucene.index.IndexWriterConfig;
 import org.apache.lucene.index.NoDeletionPolicy;
 import org.apache.lucene.index.SegmentInfos;
-import org.apache.lucene.mockfile.FilterFileSystem;
-import org.apache.lucene.mockfile.VirusCheckingFS;
 import org.apache.lucene.util.IOUtils;
 import org.apache.lucene.util.LuceneTestCase;
 import org.apache.lucene.util.TestUtil;
@@ -423,6 +420,7 @@ public class MockDirectoryWrapper extends BaseDirectoryWrapper {
         deleteFile(name);
 
         try (IndexOutput out = in.createOutput(name, LuceneTestCase.newIOContext(randomState))) {
+          out.getFilePointer(); // just fake access to prevent compiler warning
         } catch (IOException ioe) {
           // ignore
         }