File contents reset when file exists already

[Quarry]

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private void initFiles() throws IOException {       String path = Main.class.getProtectionDomain().getCodeSource()             .getLocation().getPath();       String decodedPath = URLDecoder.decode(path, "UTF-8");       File clientConfig = new File(decodedPath + "clientConfig.cfg");       boolean existed = true;       if (!clientConfig.exists()) {          clientConfig.createNewFile();          existed = false;       }       BufferedWriter cfgWriter = new BufferedWriter(new FileWriter(             clientConfig));       if (!existed) {          cfgWriter.write("127.0.0.1:10008");           cfgWriter.flush();       }       BufferedReader cfgReader = new BufferedReader(new FileReader(             clientConfig));       String serverInfo[] = cfgReader.readLine().split(":");       host = serverInfo[0];       port = Integer.parseInt(serverInfo[1]);       cfgReader.close();       cfgWriter.close();    }

I believe that the title should be self explanatory, when I execute the jar without the clientConfig.cfg it works fine, but when it exists already its contents are reset and that causes the rest of the code to stop working

[Danny02]

Because when you open it with the buffered writer you override your file with an empty one.

You should use NIO2 to have more controll, i.e. :

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Path a = Paths.get("file.xyz");         Files.newBufferedWriter(a, Charset.defaultCharset(), StandardOpenOption.TRUNCATE_EXISTING);

there are other options which create new file everytime or only if it does not exist already and so on

[Riven]

I don't believe NIO2 is the answer here. If he doesn't want to write anything, he shouldn't open a file for writing. Move the FileWriter code inside the

if(!existed)

block.

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[Quarry]

Thanks Riven!