Completablefuture 안에서만 왜 ftp NullPointException 발생할까요??

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아래 CompletableFuture를 사용하면 NullPointException이 발생합니다 ㅠㅠ참고로 CompletableFuture를 주석하고 for문을 돌리면 파일업로드 정상적으로 됩니다 ㅠㅠ원인이 뭘까요... FTPClient 는 어차피 같은 객체주소값이 나오는데... @Test void 파일디렉토리_변경_안해도_파일별로_업로드_잘되나() throws IOException { String today = DateUtil.getCurrentDate("yyyyMMddHHmmss"); final FTPClient ftp = new FTPClient(); try { ftp.connect(ftpHost, ftpPort); if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) { ftp.disconnect(); throw new UpfacException(); } ftp.setControlEncoding("euc-kr"); ftp.login(ftpUserName, ftpPassword); ftp.enterLocalPassiveMode(); ftp.setFileType(FTP.BINARY_FILE_TYPE); ftp.makeDirectory("/" + today); ftp.changeWorkingDirectory("/" + today); ArrayList files = new ArrayList<>(); File file1 = new File("D:\20230908\test1.gif"); files.add(file1); files.add(file2); files.add(file3); List> collect = files.stream() .map(file -> CompletableFuture.supplyAsync(() -> { try { // for (File file : files) { FileInputStream fis = new FileInputStream(file); ftp.storeFile(file.getName(), fis); fis.close(); // } } catch (Exception e) { e.printStackTrace(); } return null; })) .collect(Collectors.toList()); ftp.disconnect(); } catch (SocketException e) { e.printStackTrace(); } finally { ftp.disconnect(); } }아래는 Exception 내용입니다..java.lang.NullPointerException at org.apache.commons.net.SocketClient.getRemoteAddress(SocketClient.java:671) at org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:815) at org.apache.commons.net.ftp.FTPClient._storeFile(FTPClient.java:653) at org.apache.commons.net.ftp.FTPClient.__storeFile(FTPClient.java:639) at org.apache.commons.net.ftp.FTPClient.storeFile(FTPClient.java:2030) at com.upfac.common.util.FileUtilTest.lambda$null$0(FileUtilTest.java:63) at java.util.concurrent.CompletableFuture$AsyncSupply.run$$$capture(CompletableFuture.java:1590) at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java) at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1582) at java.util.concurrent.ForkJoinTask.doExec$$$capture(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

Completablefuture 안에서만 왜 ftp NullPointException 발생할까요??

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