HADOOP-16282. Avoid FileStream to improve performance. Contributed by Ayush Saxena.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java

@@ -30,7 +30,6 @@ import java.io.BufferedInputStream;
 import java.io.DataInput;
 import java.io.DataOutput;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -43,6 +42,7 @@ import java.net.InetSocketAddress;
 import java.net.JarURLConnection;
 import java.net.URL;
 import java.net.URLConnection;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -3075,7 +3075,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
           LOG.debug("parsing File " + file);
         }
         reader = (XMLStreamReader2)parse(new BufferedInputStream(
-            new FileInputStream(file)), ((Path)resource).toString(),
+            Files.newInputStream(file.toPath())), ((Path) resource).toString(),
             isRestricted);
       }
     } else if (resource instanceof InputStream) {

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/random/OsSecureRandom.java

@@ -18,9 +18,10 @@
 package org.apache.hadoop.crypto.random;
 
 import java.io.Closeable;
-import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.Random;
 
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -50,7 +51,7 @@ public class OsSecureRandom extends Random implements Closeable, Configurable {
 
   private String randomDevPath;
 
-  private transient FileInputStream stream;
+  private transient InputStream stream;
 
   private final byte[] reservoir = new byte[RESERVOIR_LENGTH];
 
@@ -60,7 +61,7 @@ public class OsSecureRandom extends Random implements Closeable, Configurable {
     if (pos >= reservoir.length - min) {
       try {
         if (stream == null) {
-          stream = new FileInputStream(new File(randomDevPath));
+          stream = Files.newInputStream(Paths.get(randomDevPath));
         }
         IOUtils.readFully(stream, reservoir, 0, reservoir.length);
       } catch (IOException e) {

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileUtil.java

@@ -22,9 +22,7 @@ import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -447,7 +445,7 @@ public class FileUtil {
       InputStream in = null;
       OutputStream out =null;
       try {
-        in = new FileInputStream(src);
+        in = Files.newInputStream(src.toPath());
         out = dstFS.create(dst);
         IOUtils.copyBytes(in, out, conf);
       } catch (IOException e) {
@@ -495,7 +493,7 @@ public class FileUtil {
       }
     } else {
       InputStream in = srcFS.open(src);
-      IOUtils.copyBytes(in, new FileOutputStream(dst), conf);
+      IOUtils.copyBytes(in, Files.newOutputStream(dst.toPath()), conf);
     }
     if (deleteSource) {
       return srcFS.delete(src, true);
@@ -639,7 +637,7 @@ public class FileUtil {
             throw new IOException("Mkdirs failed to create " +
                 parent.getAbsolutePath());
           }
-          try (OutputStream out = new FileOutputStream(file)) {
+          try (OutputStream out = Files.newOutputStream(file.toPath())) {
             IOUtils.copyBytes(zip, out, BUFFER_SIZE);
           }
           if (!file.setLastModified(entry.getTime())) {
@@ -684,7 +682,7 @@ public class FileUtil {
                                       file.getParentFile().toString());
               }
             }
-            OutputStream out = new FileOutputStream(file);
+            OutputStream out = Files.newOutputStream(file.toPath());
             try {
               byte[] buffer = new byte[8192];
               int i;
@@ -918,9 +916,10 @@ public class FileUtil {
     TarArchiveInputStream tis = null;
     try {
       if (gzipped) {
-        inputStream = new GZIPInputStream(new FileInputStream(inFile));
+        inputStream =
+            new GZIPInputStream(Files.newInputStream(inFile.toPath()));
       } else {
-        inputStream = new FileInputStream(inFile);
+        inputStream = Files.newInputStream(inFile.toPath());
       }
 
       inputStream = new BufferedInputStream(inputStream);
@@ -1544,7 +1543,7 @@ public class FileUtil {
 
     // Write the manifest to output JAR file
     File classPathJar = File.createTempFile("classpath-", ".jar", workingDir);
-    try (FileOutputStream fos = new FileOutputStream(classPathJar);
+    try (OutputStream fos = Files.newOutputStream(classPathJar.toPath());
          BufferedOutputStream bos = new BufferedOutputStream(fos)) {
       JarOutputStream jos = new JarOutputStream(bos, jarManifest);
       jos.close();

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/CopyCommands.java

@@ -18,10 +18,11 @@
 
 package org.apache.hadoop.fs.shell;
 
-import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.nio.file.Files;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
@@ -464,7 +465,7 @@ class CopyCommands {
         dst.fs.create(dst.path, false).close();
       }
 
-      FileInputStream is = null;
+      InputStream is = null;
       try (FSDataOutputStream fos = dst.fs.append(dst.path)) {
         if (readStdin) {
           if (args.size() == 0) {
@@ -477,7 +478,7 @@ class CopyCommands {
 
         // Read in each input file and write to the target.
         for (PathData source : args) {
-          is = new FileInputStream(source.toFile());
+          is = Files.newInputStream(source.toFile().toPath());
           IOUtils.copyBytes(is, fos, DEFAULT_IO_LENGTH);
           IOUtils.closeStream(is);
           is = null;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/sink/FileSink.java

@@ -19,10 +19,10 @@
 package org.apache.hadoop.metrics2.sink;
 
 import java.io.Closeable;
-import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.PrintStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 
 import org.apache.commons.configuration2.SubsetConfiguration;
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -47,7 +47,7 @@ public class FileSink implements MetricsSink, Closeable {
     String filename = conf.getString(FILENAME_KEY);
     try {
       writer = filename == null ? System.out
-          : new PrintStream(new FileOutputStream(new File(filename)),
+          : new PrintStream(Files.newOutputStream(Paths.get(filename)),
                             true, "UTF-8");
     } catch (Exception e) {
       throw new MetricsException("Error creating "+ filename, e);

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/TableMapping.java

@@ -20,9 +20,10 @@ package org.apache.hadoop.net;
 import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.NET_TOPOLOGY_TABLE_MAPPING_FILE_KEY;
 
 import java.io.BufferedReader;
-import java.io.FileInputStream;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -100,7 +101,8 @@ public class TableMapping extends CachedDNSToSwitchMapping {
 
       try (BufferedReader reader =
                new BufferedReader(new InputStreamReader(
-                   new FileInputStream(filename), StandardCharsets.UTF_8))) {
+              Files.newInputStream(Paths.get(filename)),
+              StandardCharsets.UTF_8))) {
         String line = reader.readLine();
         while (line != null) {
           line = line.trim();

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/Credentials.java

@@ -26,9 +26,9 @@ import java.io.DataInputStream;
 import java.io.DataOutput;
 import java.io.DataOutputStream;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
@@ -243,7 +243,7 @@ public class Credentials implements Writable {
     Credentials credentials = new Credentials();
     try {
       in = new DataInputStream(new BufferedInputStream(
-          new FileInputStream(filename)));
+          Files.newInputStream(filename.toPath())));
       credentials.readTokenStorageStream(in);
       return credentials;
     } catch(IOException ioe) {

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/KDiag.java

@@ -41,12 +41,12 @@ import javax.crypto.Cipher;
 
 import java.io.Closeable;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.PrintWriter;
 import java.lang.reflect.InvocationTargetException;
 import java.net.InetAddress;
+import java.nio.file.Files;
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -922,7 +922,7 @@ public class KDiag extends Configured implements Tool, Closeable {
    * @throws IOException IO problems
    */
   private void dump(File file) throws IOException {
-    try (FileInputStream in = new FileInputStream(file)) {
+    try (InputStream in = Files.newInputStream(file.toPath())) {
       for (String line : IOUtils.readLines(in)) {
         println("%s", line);
       }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/LdapGroupsMapping.java

@@ -17,11 +17,12 @@
  */
 package org.apache.hadoop.security;
 
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Hashtable;
@@ -836,7 +837,7 @@ public class LdapGroupsMapping
 
     StringBuilder password = new StringBuilder();
     try (Reader reader = new InputStreamReader(
-        new FileInputStream(pwFile), StandardCharsets.UTF_8)) {
+        Files.newInputStream(Paths.get(pwFile)), StandardCharsets.UTF_8)) {
       int c = reader.read();
       while (c > -1) {
         password.append((char)c);

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/ShellBasedIdMapping.java

@@ -19,11 +19,11 @@ package org.apache.hadoop.security;
 
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.regex.Matcher;
@@ -583,7 +583,7 @@ public class ShellBasedIdMapping implements IdMappingServiceProvider {
     Map<Integer, Integer> gidMapping = new HashMap<Integer, Integer>();
     
     BufferedReader in = new BufferedReader(new InputStreamReader(
-        new FileInputStream(staticMapFile), StandardCharsets.UTF_8));
+        Files.newInputStream(staticMapFile.toPath()), StandardCharsets.UTF_8));
     
     try {
       String line = null;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/alias/LocalJavaKeyStoreProvider.java

@@ -25,8 +25,6 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.util.Shell;
 
 import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -69,7 +67,7 @@ public final class LocalJavaKeyStoreProvider extends
     if (LOG.isDebugEnabled()) {
       LOG.debug("using '" + file + "' for output stream.");
     }
-    FileOutputStream out = new FileOutputStream(file);
+    OutputStream out = Files.newOutputStream(file.toPath());
     return out;
   }
 
@@ -81,7 +79,7 @@ public final class LocalJavaKeyStoreProvider extends
 
   @Override
   protected InputStream getInputStreamForFile() throws IOException {
-    FileInputStream is = new FileInputStream(file);
+    InputStream is = Files.newInputStream(file.toPath());
     return is;
   }
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/ssl/FileBasedKeyStoresFactory.java

@@ -28,9 +28,10 @@ import org.slf4j.LoggerFactory;
 import javax.net.ssl.KeyManager;
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.TrustManager;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.security.GeneralSecurityException;
 import java.security.KeyStore;
 import java.text.MessageFormat;
@@ -170,7 +171,7 @@ public class FileBasedKeyStoresFactory implements KeyStoresFactory {
         LOG.debug(mode.toString() + " KeyStore: " + keystoreLocation);
       }
 
-      InputStream is = new FileInputStream(keystoreLocation);
+      InputStream is = Files.newInputStream(Paths.get(keystoreLocation));
       try {
         keystore.load(is, keystorePassword.toCharArray());
       } finally {

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/ssl/ReloadingX509TrustManager.java

@@ -29,8 +29,9 @@ import javax.net.ssl.TrustManager;
 import javax.net.ssl.TrustManagerFactory;
 import javax.net.ssl.X509TrustManager;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
 import java.security.GeneralSecurityException;
 import java.security.KeyStore;
 import java.security.cert.CertificateException;
@@ -166,7 +167,7 @@ public final class ReloadingX509TrustManager
   throws IOException, GeneralSecurityException {
     X509TrustManager trustManager = null;
     KeyStore ks = KeyStore.getInstance(type);
-    FileInputStream in = new FileInputStream(file);
+    InputStream in = Files.newInputStream(file.toPath());
     try {
       ks.load(in, (password == null) ? null : password.toCharArray());
       lastLoaded = file.lastModified();

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ConfTest.java

@@ -20,9 +20,9 @@ package org.apache.hadoop.util;
 
 import java.io.File;
 import java.io.FileFilter;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -282,7 +282,7 @@ public final class ConfTest {
     boolean ok = true;
     for (File file : files) {
       String path = file.getAbsolutePath();
-      List<String> errors = checkConf(new FileInputStream(file));
+      List<String> errors = checkConf(Files.newInputStream(file.toPath()));
       if (errors.isEmpty()) {
         System.out.println(path + ": valid");
       } else {

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/FileBasedIPList.java

@@ -22,11 +22,11 @@ import org.slf4j.LoggerFactory;
 
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
@@ -90,7 +90,7 @@ public class FileBasedIPList implements IPList {
         if (file.exists()) {
           try (
               Reader fileReader = new InputStreamReader(
-                  new FileInputStream(file), StandardCharsets.UTF_8);
+                  Files.newInputStream(file.toPath()), StandardCharsets.UTF_8);
               BufferedReader bufferedReader = new BufferedReader(fileReader)) {
             List<String> lines = new ArrayList<String>();
             String line = null;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/HostsFileReader.java

@@ -20,6 +20,7 @@ package org.apache.hadoop.util;
 
 import java.io.*;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.Collections;
 import java.util.Set;
 import java.util.HashMap;
@@ -74,7 +75,7 @@ public class HostsFileReader {
   public static void readFileToSet(String type,
       String filename, Set<String> set) throws IOException {
     File file = new File(filename);
-    FileInputStream fis = new FileInputStream(file);
+    InputStream fis = Files.newInputStream(file.toPath());
     readFileToSetWithFileInputStream(type, filename, fis, set);
   }
 
@@ -120,7 +121,7 @@ public class HostsFileReader {
   public static void readFileToMap(String type,
       String filename, Map<String, Integer> map) throws IOException {
     File file = new File(filename);
-    FileInputStream fis = new FileInputStream(file);
+    InputStream fis = Files.newInputStream(file.toPath());
     readFileToMapWithFileInputStream(type, filename, fis, map);
   }
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/JsonSerialization.java

@@ -21,10 +21,10 @@ package org.apache.hadoop.util;
 import java.io.EOFException;
 import java.io.File;
 import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.file.Files;
 import java.util.Map;
 
 import com.fasterxml.jackson.core.JsonParseException;
@@ -190,7 +190,7 @@ public class JsonSerialization<T> {
    */
   public void save(File file, T instance) throws
       IOException {
-    writeJsonAsBytes(instance, new FileOutputStream(file));
+    writeJsonAsBytes(instance, Files.newOutputStream(file.toPath()));
   }
 
   /**

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/RunJar.java

@@ -19,7 +19,6 @@
 package org.apache.hadoop.util;
 
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -28,6 +27,7 @@ import java.lang.reflect.Method;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Enumeration;
@@ -129,7 +129,7 @@ public class RunJar {
                 + " would create file outside of " + toDir);
           }
           ensureDirectory(file.getParentFile());
-          try (OutputStream out = new FileOutputStream(file)) {
+          try (OutputStream out = Files.newOutputStream(file.toPath())) {
             IOUtils.copyBytes(jar, out, BUFFER_SIZE);
           }
           if (!file.setLastModified(entry.getTime())) {
@@ -166,7 +166,7 @@ public class RunJar {
       throws IOException{
     File file = new File(toDir, name);
     ensureDirectory(toDir);
-    try (OutputStream jar = new FileOutputStream(file);
+    try (OutputStream jar = Files.newOutputStream(file.toPath());
          TeeInputStream teeInputStream = new TeeInputStream(inputStream, jar)) {
       unJar(teeInputStream, toDir, unpackRegex);
     }
@@ -200,7 +200,7 @@ public class RunJar {
                   + " would create file outside of " + toDir);
             }
             ensureDirectory(file.getParentFile());
-            try (OutputStream out = new FileOutputStream(file)) {
+            try (OutputStream out = Files.newOutputStream(file.toPath())) {
               IOUtils.copyBytes(in, out, BUFFER_SIZE);
             }
             if (!file.setLastModified(entry.getTime())) {

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoLinux.java

@@ -19,12 +19,12 @@
 package org.apache.hadoop.util;
 
 import java.io.BufferedReader;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
 import java.io.InputStreamReader;
 import java.io.IOException;
 import java.math.BigInteger;
 import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.regex.Matcher;
@@ -246,9 +246,10 @@ public class SysInfoLinux extends SysInfo {
     InputStreamReader fReader;
     try {
       fReader = new InputStreamReader(
-          new FileInputStream(procfsMemFile), Charset.forName("UTF-8"));
+          Files.newInputStream(Paths.get(procfsMemFile)),
+          Charset.forName("UTF-8"));
       in = new BufferedReader(fReader);
-    } catch (FileNotFoundException f) {
+    } catch (IOException f) {
       // shouldn't happen....
       LOG.warn("Couldn't read " + procfsMemFile
           + "; can't determine memory settings");
@@ -316,10 +317,11 @@ public class SysInfoLinux extends SysInfo {
     BufferedReader in;
     InputStreamReader fReader;
     try {
-      fReader = new InputStreamReader(
-          new FileInputStream(procfsCpuFile), Charset.forName("UTF-8"));
+      fReader =
+          new InputStreamReader(Files.newInputStream(Paths.get(procfsCpuFile)),
+              Charset.forName("UTF-8"));
       in = new BufferedReader(fReader);
-    } catch (FileNotFoundException f) {
+    } catch (IOException f) {
       // shouldn't happen....
       LOG.warn("Couldn't read " + procfsCpuFile + "; can't determine cpu info");
       return;
@@ -377,9 +379,10 @@ public class SysInfoLinux extends SysInfo {
     InputStreamReader fReader;
     try {
       fReader = new InputStreamReader(
-          new FileInputStream(procfsStatFile), Charset.forName("UTF-8"));
+          Files.newInputStream(Paths.get(procfsStatFile)),
+          Charset.forName("UTF-8"));
       in = new BufferedReader(fReader);
-    } catch (FileNotFoundException f) {
+    } catch (IOException f) {
       // shouldn't happen....
       return;
     }
@@ -431,9 +434,10 @@ public class SysInfoLinux extends SysInfo {
     InputStreamReader fReader;
     try {
       fReader = new InputStreamReader(
-          new FileInputStream(procfsNetFile), Charset.forName("UTF-8"));
+          Files.newInputStream(Paths.get(procfsNetFile)),
+          Charset.forName("UTF-8"));
       in = new BufferedReader(fReader);
-    } catch (FileNotFoundException f) {
+    } catch (IOException f) {
       return;
     }
 
@@ -485,8 +489,9 @@ public class SysInfoLinux extends SysInfo {
     BufferedReader in;
     try {
       in = new BufferedReader(new InputStreamReader(
-            new FileInputStream(procfsDisksFile), Charset.forName("UTF-8")));
-    } catch (FileNotFoundException f) {
+          Files.newInputStream(Paths.get(procfsDisksFile)),
+          Charset.forName("UTF-8")));
+    } catch (IOException f) {
       return;
     }
 
@@ -552,9 +557,9 @@ public class SysInfoLinux extends SysInfo {
     BufferedReader in;
     try {
       in = new BufferedReader(new InputStreamReader(
-            new FileInputStream(procfsDiskSectorFile),
+          Files.newInputStream(Paths.get(procfsDiskSectorFile)),
               Charset.forName("UTF-8")));
-    } catch (FileNotFoundException f) {
+    } catch (IOException f) {
       return defSector;
     }
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/hash/JenkinsHash.java

@@ -18,8 +18,10 @@
 
 package org.apache.hadoop.util.hash;
 
-import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
@@ -252,7 +254,7 @@ public class JenkinsHash extends Hash {
       System.err.println("Usage: JenkinsHash filename");
       System.exit(-1);
     }
-    try (FileInputStream in = new FileInputStream(args[0])) {
+    try (InputStream in = Files.newInputStream(Paths.get(args[0]))) {
       byte[] bytes = new byte[512];
       int value = 0;
       JenkinsHash hash = new JenkinsHash();

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestHostsFileReader.java

@@ -18,8 +18,8 @@
 package org.apache.hadoop.util;
 
 import java.io.File;
-import java.io.FileNotFoundException;
 import java.io.FileWriter;
+import java.nio.file.NoSuchFileException;
 import java.util.Map;
 
 import org.apache.hadoop.test.GenericTestUtils;
@@ -135,8 +135,8 @@ public class TestHostsFileReader {
       new HostsFileReader(
           HOSTS_TEST_DIR + "/doesnt-exist",
           HOSTS_TEST_DIR + "/doesnt-exist");
-      Assert.fail("Should throw FileNotFoundException");
-    } catch (FileNotFoundException ex) {
+      Assert.fail("Should throw NoSuchFileException");
+    } catch (NoSuchFileException ex) {
       // Exception as expected
     }
   }
@@ -157,8 +157,8 @@ public class TestHostsFileReader {
     assertTrue(INCLUDES_FILE.delete());
     try {
       hfp.refresh();
-      Assert.fail("Should throw FileNotFoundException");
-    } catch (FileNotFoundException ex) {
+      Assert.fail("Should throw NoSuchFileException");
+    } catch (NoSuchFileException ex) {
       // Exception as expected
     }
   }

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/util/CombinedHostsFileReader.java

@@ -24,10 +24,11 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.ObjectReader;
 
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.InputStreamReader;
 import java.io.IOException;
 import java.io.Reader;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
@@ -82,8 +83,8 @@ public final class CombinedHostsFileReader {
 
     if (hostFile.length() > 0) {
       try (Reader input =
-                   new InputStreamReader(new FileInputStream(hostFile),
-                           "UTF-8")) {
+          new InputStreamReader(
+              Files.newInputStream(hostFile.toPath()), "UTF-8")) {
         allDNs = objectMapper.readValue(input, DatanodeAdminProperties[].class);
       } catch (JsonMappingException jme) {
         // The old format doesn't have json top-level token to enclose
@@ -101,7 +102,7 @@ public final class CombinedHostsFileReader {
       JsonFactory jsonFactory = new JsonFactory();
       List<DatanodeAdminProperties> all = new ArrayList<>();
       try (Reader input =
-          new InputStreamReader(new FileInputStream(hostsFilePath),
+          new InputStreamReader(Files.newInputStream(Paths.get(hostsFilePath)),
                   "UTF-8")) {
         Iterator<DatanodeAdminProperties> iterator =
             objectReader.readValues(jsonFactory.createParser(input));

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/util/CombinedHostsFileWriter.java

@@ -18,11 +18,11 @@
 
 package org.apache.hadoop.hdfs.util;
 
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
 import java.io.Writer;
-
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.Set;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
@@ -61,7 +61,8 @@ public final class CombinedHostsFileWriter {
     final ObjectMapper objectMapper = new ObjectMapper();
 
     try (Writer output =
-       new OutputStreamWriter(new FileOutputStream(hostsFile), "UTF-8")) {
+        new OutputStreamWriter(Files.newOutputStream(Paths.get(hostsFile)),
+            "UTF-8")) {
       objectMapper.writeValue(output, allDNs);
     }
   }

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSAuthenticationFilter.java

@@ -27,11 +27,12 @@ import org.apache.hadoop.security.token.delegation.web.KerberosDelegationTokenAu
 import javax.servlet.FilterConfig;
 import javax.servlet.ServletException;
 
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.Map;
 import java.util.Properties;
 
@@ -82,8 +83,8 @@ public class HttpFSAuthenticationFilter
 
     try {
       StringBuilder secret = new StringBuilder();
-      Reader reader = new InputStreamReader(new FileInputStream(
-          signatureSecretFile), StandardCharsets.UTF_8);
+      Reader reader = new InputStreamReader(Files.newInputStream(Paths.get(
+          signatureSecretFile)), StandardCharsets.UTF_8);
       int c = reader.read();
       while (c > -1) {
         secret.append((char)c);

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/server/Server.java

@@ -30,9 +30,9 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.file.Files;
 import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -470,7 +470,7 @@ public class Server {
         }
         try {
           log.debug("Loading site configuration from [{}]", siteFile);
-          inputStream = new FileInputStream(siteFile);
+          inputStream = Files.newInputStream(siteFile.toPath());
           siteConf = new Configuration(false);
           ConfigurationUtils.load(siteConf, inputStream);
         } catch (IOException ex) {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/Journal.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.hdfs.qjournal.server;
 import com.google.protobuf.ByteString;
 import java.io.Closeable;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStreamWriter;
@@ -1058,7 +1057,7 @@ public class Journal implements Closeable {
       return null;
     }
     
-    InputStream in = new FileInputStream(f);
+    InputStream in = Files.newInputStream(f.toPath());
     try {
       PersistedRecoveryPaxosData ret = PersistedRecoveryPaxosData.parseDelimitedFrom(in);
       Preconditions.checkState(ret != null &&

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/aliasmap/InMemoryAliasMap.java

@@ -53,9 +53,9 @@ import java.io.BufferedOutputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.net.URI;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Map;
 import java.util.Optional;
@@ -324,7 +324,8 @@ public class InMemoryAliasMap implements InMemoryAliasMapProtocol,
     GzipCompressorOutputStream gzOut = null;
     TarArchiveOutputStream tOut = null;
     try {
-      bOut = new BufferedOutputStream(new FileOutputStream(outCompressedFile));
+      bOut = new BufferedOutputStream(
+          Files.newOutputStream(outCompressedFile.toPath()));
       gzOut = new GzipCompressorOutputStream(bOut);
       tOut = new TarArchiveOutputStream(gzOut);
       addFileToTarGzRecursively(tOut, aliasMapDir, "", new Configuration());

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java

@@ -28,6 +28,7 @@ import java.io.InputStream;
 import java.io.OutputStreamWriter;
 import java.io.RandomAccessFile;
 import java.io.Writer;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -311,7 +312,7 @@ class BlockPoolSlice {
     try {
       long used = getDfsUsed();
       try (Writer out = new OutputStreamWriter(
-          new FileOutputStream(outFile), "UTF-8")) {
+          Files.newOutputStream(outFile.toPath()), "UTF-8")) {
         // mtime is written last, so that truncated writes won't be valid.
         out.write(Long.toString(used) + " " + Long.toString(timer.now()));
         // This is only called as part of the volume shutdown.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java

@@ -28,6 +28,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.nio.channels.ClosedChannelException;
 import java.nio.channels.FileChannel;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
@@ -1149,7 +1150,7 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
         }
       }
       metaOut = new DataOutputStream(new BufferedOutputStream(
-          new FileOutputStream(dstMeta), smallBufferSize));
+          Files.newOutputStream(dstMeta.toPath()), smallBufferSize));
       BlockMetadataHeader.writeHeader(metaOut, checksum);
 
       int offset = 0;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetUtil.java

@@ -21,7 +21,6 @@ import java.io.ByteArrayOutputStream;
 import java.io.DataOutputStream;
 import java.io.File;
 import java.io.FileDescriptor;
-import java.io.FileInputStream;
 import java.io.FilenameFilter;
 import java.io.IOException;
 import java.io.InputStream;
@@ -193,7 +192,7 @@ public class FsDatasetUtil {
       @Override
       public InputStream getDataInputStream(long seekOffset)
           throws IOException {
-        return new FileInputStream(blockFile);
+        return Files.newInputStream(blockFile.toPath());
       }
     };
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/command/Command.java

@@ -54,12 +54,12 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.Closeable;
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.PrintStream;
 import java.net.InetSocketAddress;
 import java.net.URI;
 import java.net.URL;
+import java.nio.file.NoSuchFileException;
 import java.nio.file.Paths;
 import java.text.SimpleDateFormat;
 import java.util.Collections;
@@ -274,7 +274,7 @@ public abstract class Command extends Configured implements Closeable {
       try {
         HostsFileReader.readFileToSet("include",
             Paths.get(listURL.getPath()).toString(), resultSet);
-      } catch (FileNotFoundException e) {
+      } catch (NoSuchFileException e) {
         String warnMsg = String
             .format("The input host file path '%s' is not a valid path. "
                 + "Please make sure the host file exists.", listArg);

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/EditLogFileInputStream.java

@@ -23,11 +23,11 @@ import java.io.BufferedInputStream;
 import java.io.DataInputStream;
 import java.io.EOFException;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
+import java.nio.file.Files;
 import java.security.PrivilegedExceptionAction;
 
 import org.slf4j.Logger;
@@ -430,7 +430,7 @@ public class EditLogFileInputStream extends EditLogInputStream {
 
     @Override
     public InputStream getInputStream() throws IOException {
-      return new FileInputStream(file);
+      return Files.newInputStream(file.toPath());
     }
 
     @Override

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImageFormat.java

@@ -23,9 +23,10 @@ import java.io.DataInput;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
 import java.security.DigestInputStream;
 import java.security.DigestOutputStream;
 import java.security.MessageDigest;
@@ -215,9 +216,9 @@ public class FSImageFormat {
         throws IOException {
       Preconditions.checkState(impl == null, "Image already loaded!");
 
-      FileInputStream is = null;
+      InputStream is = null;
       try {
-        is = new FileInputStream(file);
+        is = Files.newInputStream(file.toPath());
         byte[] magic = new byte[FSImageUtil.MAGIC_HEADER.length];
         IOUtils.readFully(is, magic, 0, magic.length);
         if (Arrays.equals(magic, FSImageUtil.MAGIC_HEADER)) {
@@ -318,7 +319,7 @@ public class FSImageFormat {
       //
       MessageDigest digester = MD5Hash.getDigester();
       DigestInputStream fin = new DigestInputStream(
-           new FileInputStream(curFile), digester);
+          Files.newInputStream(curFile.toPath()), digester);
 
       DataInputStream in = new DataInputStream(fin);
       try {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImagePreTransactionalStorageInspector.java

@@ -20,8 +20,8 @@ package org.apache.hadoop.hdfs.server.namenode;
 
 import java.io.DataInputStream;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashSet;
@@ -130,7 +130,8 @@ class FSImagePreTransactionalStorageInspector extends FSImageStorageInspector {
     File timeFile = NNStorage.getStorageFile(sd, NameNodeFile.TIME);
     long timeStamp = 0L;
     if (timeFile.exists() && FileUtil.canRead(timeFile)) {
-      DataInputStream in = new DataInputStream(new FileInputStream(timeFile));
+      DataInputStream in = new DataInputStream(
+          Files.newInputStream(timeFile.toPath()));
       try {
         timeStamp = in.readLong();
         in.close();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -117,7 +117,6 @@ import java.io.DataInput;
 import java.io.DataOutputStream;
 import java.io.File;
 import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
@@ -126,6 +125,7 @@ import java.lang.management.ManagementFactory;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.URI;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -1774,7 +1774,8 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       checkOperation(OperationCategory.READ);
       File file = new File(System.getProperty("hadoop.log.dir"), filename);
       PrintWriter out = new PrintWriter(new BufferedWriter(
-          new OutputStreamWriter(new FileOutputStream(file), Charsets.UTF_8)));
+          new OutputStreamWriter(Files.newOutputStream(file.toPath()),
+              Charsets.UTF_8)));
       metaSave(out);
       out.flush();
       out.close();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DebugAdmin.java

@@ -21,7 +21,6 @@ import java.io.BufferedOutputStream;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
@@ -29,6 +28,7 @@ import java.net.URI;
 import java.net.URISyntaxException;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
+import java.nio.file.Files;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
@@ -276,7 +276,7 @@ public class DebugAdmin extends Configured implements Tool {
 
         final int smallBufferSize = DFSUtilClient.getSmallBufferSize(conf);
         metaOut = new DataOutputStream(
-            new BufferedOutputStream(new FileOutputStream(srcMeta),
+            new BufferedOutputStream(Files.newOutputStream(srcMeta.toPath()),
                 smallBufferSize));
         BlockMetadataHeader.writeHeader(metaOut, checksum);
         metaOut.close();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineEditsViewer/OfflineEditsVisitorFactory.java

@@ -17,9 +17,10 @@
  */
 package org.apache.hadoop.hdfs.tools.offlineEditsViewer;
 
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
@@ -48,7 +49,7 @@ public class OfflineEditsVisitorFactory {
       return new BinaryEditsVisitor(filename);
     }
     OfflineEditsVisitor vis;
-    OutputStream fout = new FileOutputStream(filename);
+    OutputStream fout = Files.newOutputStream(Paths.get(filename));
     OutputStream out = null;
     try {
       if (!printToScreen) {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/OfflineImageReconstructor.java

@@ -31,10 +31,10 @@ import static org.apache.hadoop.hdfs.tools.offlineImageViewer.PBImageXmlWriter.*
 
 import java.io.BufferedOutputStream;
 import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.io.OutputStream;
 import java.nio.ByteBuffer;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
@@ -1821,16 +1821,16 @@ class OfflineImageReconstructor {
   public static void run(String inputPath, String outputPath)
       throws Exception {
     MessageDigest digester = MD5Hash.getDigester();
-    FileOutputStream fout = null;
+    OutputStream fout = null;
     File foutHash = new File(outputPath + ".md5");
     Files.deleteIfExists(foutHash.toPath()); // delete any .md5 file that exists
     CountingOutputStream out = null;
-    FileInputStream fis = null;
+    InputStream fis = null;
     InputStreamReader reader = null;
     try {
       Files.deleteIfExists(Paths.get(outputPath));
-      fout = new FileOutputStream(outputPath);
-      fis = new FileInputStream(inputPath);
+      fout = Files.newOutputStream(Paths.get(outputPath));
+      fis = Files.newInputStream(Paths.get(inputPath));
       reader = new InputStreamReader(fis, Charset.forName("UTF-8"));
       out = new CountingOutputStream(
           new DigestOutputStream(

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/OfflineImageViewer.java

@@ -20,9 +20,9 @@ package org.apache.hadoop.hdfs.tools.offlineImageViewer;
 import java.io.BufferedInputStream;
 import java.io.DataInputStream;
 import java.io.EOFException;
-import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 
 import org.apache.commons.cli.CommandLine;
 import org.apache.commons.cli.CommandLineParser;
@@ -126,7 +126,7 @@ public class OfflineImageViewer {
     boolean done = false;
     try {
       tracker = new PositionTrackingInputStream(new BufferedInputStream(
-               new FileInputStream(new File(inputFile))));
+          Files.newInputStream(Paths.get(inputFile))));
       in = new DataInputStream(tracker);
 
       int imageVersionFile = findImageVersion(in);

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TextWriterImageVisitor.java

@@ -17,9 +17,10 @@
  */
 package org.apache.hadoop.hdfs.tools.offlineImageViewer;
 
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 
 import com.google.common.base.Charsets;
 
@@ -59,7 +60,8 @@ abstract class TextWriterImageVisitor extends ImageVisitor {
          throws IOException {
     super();
     this.printToScreen = printToScreen;
-    fw = new OutputStreamWriter(new FileOutputStream(filename), Charsets.UTF_8);
+    fw = new OutputStreamWriter(Files.newOutputStream(Paths.get(filename)),
+        Charsets.UTF_8);
     okToWrite = true;
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/MD5FileUtils.java

@@ -19,11 +19,11 @@ package org.apache.hadoop.hdfs.util;
 
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.nio.file.Files;
 import java.security.DigestInputStream;
 import java.security.MessageDigest;
 import java.util.regex.Matcher;
@@ -74,8 +74,8 @@ public abstract class MD5FileUtils {
    */
   private static Matcher readStoredMd5(File md5File) throws IOException {
     BufferedReader reader =
-        new BufferedReader(new InputStreamReader(new FileInputStream(
-            md5File), Charsets.UTF_8));
+        new BufferedReader(new InputStreamReader(
+            Files.newInputStream(md5File.toPath()), Charsets.UTF_8));
     String md5Line;
     try {
       md5Line = reader.readLine();
@@ -125,7 +125,7 @@ public abstract class MD5FileUtils {
    * Read dataFile and compute its MD5 checksum.
    */
   public static MD5Hash computeMd5ForFile(File dataFile) throws IOException {
-    InputStream in = new FileInputStream(dataFile);
+    InputStream in = Files.newInputStream(dataFile.toPath());
     try {
       MessageDigest digester = MD5Hash.getDigester();
       DigestInputStream dis = new DigestInputStream(in, digester);

hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/RegexCopyFilter.java

@@ -25,12 +25,12 @@ import org.apache.hadoop.io.IOUtils;
 
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.nio.charset.Charset;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.regex.Pattern;
@@ -63,7 +63,7 @@ public class RegexCopyFilter extends CopyFilter {
   public void initialize() {
     BufferedReader reader = null;
     try {
-      InputStream is = new FileInputStream(filtersFile);
+      InputStream is = Files.newInputStream(filtersFile.toPath());
       reader = new BufferedReader(new InputStreamReader(is,
           Charset.forName("UTF-8")));
       String line;