diff --git a/core/src/test/scala/org/apache/spark/storage/DiskStoreSuite.scala b/core/src/test/scala/org/apache/spark/storage/DiskStoreSuite.scala
index b64422465226..8baaa68692a8 100644
--- a/core/src/test/scala/org/apache/spark/storage/DiskStoreSuite.scala
+++ b/core/src/test/scala/org/apache/spark/storage/DiskStoreSuite.scala
@@ -18,9 +18,10 @@
 package org.apache.spark.storage
 
 import java.nio.{ByteBuffer, MappedByteBuffer}
+import java.nio.file.Files
 import java.util.{Arrays, Random}
 
-import com.google.common.io.{ByteStreams, Files}
+import com.google.common.io.ByteStreams
 import io.netty.channel.FileRegion
 
 import org.apache.spark.{SecurityManager, SparkConf, SparkFunSuite}
@@ -150,7 +151,7 @@ class DiskStoreSuite extends SparkFunSuite {
 
     assert(diskStore.getSize(blockId) === testData.length)
 
-    val diskData = Files.toByteArray(diskBlockManager.getFile(blockId.name))
+    val diskData = Files.readAllBytes(diskBlockManager.getFile(blockId.name).toPath)
     assert(!Arrays.equals(testData, diskData))
 
     val blockData = diskStore.getBytes(blockId)
diff --git a/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/DriverKubernetesCredentialsFeatureStep.scala b/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/DriverKubernetesCredentialsFeatureStep.scala
index 462d70dee534..2941d3e9f9e7 100644
--- a/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/DriverKubernetesCredentialsFeatureStep.scala
+++ b/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/DriverKubernetesCredentialsFeatureStep.scala
@@ -18,10 +18,11 @@ package org.apache.spark.deploy.k8s.features
 
 import java.io.File
 import java.nio.charset.StandardCharsets
+import java.nio.file.Files
 
 import scala.jdk.CollectionConverters._
 
-import com.google.common.io.{BaseEncoding, Files}
+import com.google.common.io.BaseEncoding
 import io.fabric8.kubernetes.api.model.{ContainerBuilder, HasMetadata, PodBuilder, Secret, SecretBuilder}
 
 import org.apache.spark.deploy.k8s.{KubernetesConf, SparkPod}
@@ -153,7 +154,7 @@ private[spark] class DriverKubernetesCredentialsFeatureStep(kubernetesConf: Kube
       .map { file =>
         require(file.isFile, String.format("%s provided at %s does not exist or is not a file.",
           fileType, file.getAbsolutePath))
-        BaseEncoding.base64().encode(Files.toByteArray(file))
+        BaseEncoding.base64().encode(Files.readAllBytes(file.toPath))
       }
   }
 
diff --git a/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/KerberosConfDriverFeatureStep.scala b/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/KerberosConfDriverFeatureStep.scala
index 032a5266b0f2..67133755ee1a 100644
--- a/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/KerberosConfDriverFeatureStep.scala
+++ b/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/KerberosConfDriverFeatureStep.scala
@@ -17,11 +17,11 @@
 package org.apache.spark.deploy.k8s.features
 
 import java.io.File
+import java.nio.file.Files
 
 import scala.jdk.CollectionConverters._
 import scala.util.control.NonFatal
 
-import com.google.common.io.Files
 import io.fabric8.kubernetes.api.model._
 import org.apache.commons.codec.binary.Base64
 import org.apache.hadoop.security.UserGroupInformation
@@ -235,7 +235,7 @@ private[spark] class KerberosConfDriverFeatureStep(kubernetesConf: KubernetesDri
             .endMetadata()
           .withImmutable(true)
           .addToData(
-            Map(file.getName() -> java.nio.file.Files.readString(file.toPath)).asJava)
+            Map(file.getName() -> Files.readString(file.toPath)).asJava)
           .build()
       }
     } ++ {
@@ -247,7 +247,7 @@ private[spark] class KerberosConfDriverFeatureStep(kubernetesConf: KubernetesDri
             .withName(ktSecretName)
             .endMetadata()
           .withImmutable(true)
-          .addToData(kt.getName(), Base64.encodeBase64String(Files.toByteArray(kt)))
+          .addToData(kt.getName(), Base64.encodeBase64String(Files.readAllBytes(kt.toPath)))
           .build())
       } else {
         Nil
diff --git a/scalastyle-config.xml b/scalastyle-config.xml
index 335bf09c6dec..3abcdc79d19b 100644
--- a/scalastyle-config.xml
+++ b/scalastyle-config.xml
@@ -282,6 +282,11 @@ This file is divided into 3 sections:
       scala.jdk.CollectionConverters._ and use .asScala / .asJava methods</customMessage>
   </check>
 
+  <check customId="toByteArray" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
+    <parameters><parameter name="regex">\bFiles\.toByteArray\b</parameter></parameters>
+    <customMessage>Use java.nio.file.Files.readAllBytes instead.</customMessage>
+  </check>
+
   <check customId="getTempDirectory" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
     <parameters><parameter name="regex">\bFileUtils\.getTempDirectory\b</parameter></parameters>
     <customMessage>Use System.getProperty instead.</customMessage>
diff --git a/streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala b/streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala
index 8aa9728bd8dc..8a32f07537ff 100644
--- a/streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala
+++ b/streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala
@@ -18,12 +18,12 @@
 package org.apache.spark.streaming
 
 import java.io._
+import java.nio.file.Files
 import java.util.concurrent.ConcurrentLinkedQueue
 
 import scala.jdk.CollectionConverters._
 import scala.reflect.ClassTag
 
-import com.google.common.io.Files
 import org.apache.hadoop.conf.Configuration
 import org.apache.hadoop.fs.{FileSystem, Path}
 import org.apache.hadoop.io.{IntWritable, Text}
@@ -648,7 +648,7 @@ class CheckpointSuite extends TestSuiteBase with LocalStreamingContext with DStr
      */
     def writeFile(i: Int, clock: Clock): Unit = {
       val file = new File(testDir, i.toString)
-      java.nio.file.Files.writeString(file.toPath, s"$i\n")
+      Files.writeString(file.toPath, s"$i\n")
       assert(file.setLastModified(clock.getTimeMillis()))
       // Check that the file's modification date is actually the value we wrote, since rounding or
       // truncation will break the test:
@@ -878,8 +878,8 @@ class CheckpointSuite extends TestSuiteBase with LocalStreamingContext with DStr
     assert(checkpointFiles.size === 2)
     // Although bytes2 was written with an old time, it contains the latest status, so we should
     // try to read from it at first.
-    assert(Files.toByteArray(checkpointFiles(0)) === bytes2)
-    assert(Files.toByteArray(checkpointFiles(1)) === bytes1)
+    assert(Files.readAllBytes(checkpointFiles(0).toPath) === bytes2)
+    assert(Files.readAllBytes(checkpointFiles(1).toPath) === bytes1)
     checkpointWriter.stop()
   }