## Symptom
---------------------------------------------------
STDERR:
java.nio.file.FileAlreadyExistsException: /home/fool/fujie/workspace/jdk/JTwork/classes/runtime/containers/docker/TestCPUSets.d/whitebox.jar
        at java.base/sun.nio.fs.UnixCopyFile.copy(UnixCopyFile.java:573)
        at java.base/sun.nio.fs.UnixFileSystemProvider.copy(UnixFileSystemProvider.java:258)
        at java.base/java.nio.file.Files.copy(Files.java:1297)
        at jdk.test.lib.containers.docker.Common.prepareWhiteBox(Common.java:48)
        at TestCPUSets.main(TestCPUSets.java:57)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
        at java.base/java.lang.Thread.run(Thread.java:835)

JavaTest Message: Test threw exception: java.nio.file.FileAlreadyExistsException: /home/fool/fujie/workspace/jdk/JTwork/classes/runtime/containers/docker/TestCPUSets.d/whitebox.jar
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.nio.file.FileAlreadyExistsException: /home/fool/fujie/workspace/jdk/JTwork/classes/runtime/containers/docker/TestCPUSets.d/whitebox.jar
---------------------------------------------------

## Reproduce
---------------------------------------------------
#!/bin/bash

JTREG=/home/fool/fujie/workspace/jtreg/build/images/jtreg
TESTJDK=/home/fool/jdk/build/linux-x86_64-server-release/images/jdk
DOCKER_ARGS="-Djdk.test.docker.image.name=ubuntu -Djdk.test.docker.image.version=latest"

rm JTreport JTwork -rf

for i in {1..2}; do

  echo -e "\nRun ${i} ...\n"

  ${JTREG}/bin/jtreg \
    -jdk:${TESTJDK} \
    ${DOCKER_ARGS} \
    test/hotspot/jtreg/runtime/containers/docker/TestCPUSets.java

done
---------------------------------------------------

## Fix
---------------------------------------------------
diff -r 55025f677f68 test/lib/jdk/test/lib/containers/docker/Common.java
--- a/test/lib/jdk/test/lib/containers/docker/Common.java Thu Mar 28 04:30:52 2019 +0000
+++ b/test/lib/jdk/test/lib/containers/docker/Common.java Thu Mar 28 14:00:09 2019 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,6 +30,7 @@
 import java.io.File;
 import java.nio.file.Files;
 import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
 import jdk.test.lib.containers.docker.DockerRunOptions;
 import jdk.test.lib.containers.docker.DockerTestUtils;
 import jdk.test.lib.Utils;
@@ -46,7 +47,7 @@
 
     public static void prepareWhiteBox() throws Exception {
         Files.copy(Paths.get(new File("whitebox.jar").getAbsolutePath()),
- Paths.get(Utils.TEST_CLASSES, "whitebox.jar"));
+ Paths.get(Utils.TEST_CLASSES, "whitebox.jar"), StandardCopyOption.REPLACE_EXISTING);
     }
 
 
---------------------------------------------------