Launcher.createLauncher and trace PrintWriter

[gquerret]

Hello,

My language server is started from a Main class using createLauncher(Object localService, Class<T> remoteInterface, InputStream in, OutputStream out, boolean validate, PrintWriter trace). However, when I use try-with-resources construct for the trace argument, the file is overwritten, nothing is written the output file.

// This code overwrites the trace file, but doesn't write anything in it
try (var out = Files.newOutputStream(traceFile)) {
  var writer = new PrintWriter(out);
  createLauncher(server, ProparseLanguageClient.class, in, out, false, writer);
}

// This code writes all communication between client and server
try {
  var out = Files.newOutputStream(traceFile);
  var writer = new PrintWriter(out);
  createLauncher(server, ProparseLanguageClient.class, in, out, false, writer);
}

While writing this post, it seems to me that I'm missing something obvious, but can't put the finger on it.

[nixel2007]

Well, with try-with-resources output stream becomes closed. So print writer can't write to it

[gquerret]

Thanks for the answer! Did too much refactoring, and completely missed that. Guess it's probably the kind of day where I should avoid writing any code...