RFR: CODETOOLS-7902217: use try-with-resources where possible

[Jonathan Gibbons]

On 07/13/2018 10:30 AM, dmitry.bessonov at oracle.com wrote:
> Please review the following fix related to Automatic Resource 
> Management applied to JTHarness code base.
>
> JBS: https://bugs.openjdk.java.net/browse/CODETOOLS-7902217
> Webrev: http://cr.openjdk.java.net/~dbessono/7902217/webrev/
>
> dmitry

Generally good.

As always, there's more that can be done:

Lots of places where you could use Files.new* API.  E.g. lines like this

  489         try (Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(index), StandardCharsets.UTF_8))) {



There are also some potential sites that were not caught by the IDE, 
such as in Desktop.java and ConfigManager.java

  971             try (FileInputStream fis = new FileInputStream(file);
  972                 InputStream in = new BufferedInputStream(fis)) {
  973                 Properties props = new Properties();
  974                 props.load(in);
  975                 in.close();
  976                 return props;
  977             }


-- Jon