Another solution when it comes to deleting a temporary file relies on StandardOpenOption.DELETE_ON_CLOSE (this deletes the file when the stream is closed). For example, the following piece of code creates a temporary file via the createTempFile() method and opens a buffered writer stream for it with DELETE_ON_CLOSE explicitly specified:

Path customBaseDir = FileSystems.getDefault().getPath("D:/tmp");
String customFilePrefix = "log_";
String customFileSuffix = ".txt";
Path tmpFile = null;

try {
  tmpFile = Files.createTempFile(
    customBaseDir, customFilePrefix, customFileSuffix);
} catch (IOException e) {
  ...
}

try (BufferedWriter bw = Files.newBufferedWriter(tmpFile,
    StandardCharsets.UTF_8, StandardOpenOption.DELETE_ON_CLOSE)) {

  //simulate some operations with temp file until delete it
  Thread.sleep(10000);
} catch (IOException | InterruptedException e) {
  ...
}