<p><b>@sqrrm</b> requested changes on this pull request.</p>

<p>NACK</p>
<p>See comments on exception usage.</p>
<p>Comments on braces are not blocking but it would be good to address the multiline blocks.</p>
<p>Apart from those comments it looks ready to merge.</p><hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/3889#discussion_r368680974">common/src/main/java/bisq/common/config/Config.java</a>:</p>
<pre style='color:#555'>> +                        .withRequiredArg()
+                        .ofType(String.class)
+                        .describedAs("OFF|ALL|ERROR|WARN|INFO|DEBUG|TRACE")
+                        .defaultsTo(Level.INFO.levelStr);
+
+        ArgumentAcceptingOptionSpec<Path> torrcFileOpt =
+                parser.accepts("torrcFile", "An existing torrc-file to be sourced for Tor. Note that torrc-entries, " +
+                        "which are critical to Bisq's correct operation, cannot be overwritten.")
+                        .withRequiredArg()
+                        .withValuesConvertedBy(new PathConverter(PathProperties.FILE_EXISTING, PathProperties.READABLE));
+
+        try {
+            OptionSet cliOpts = parser.parse(args);
+
+            if (cliOpts.has(helpOpt))
+                throw new HelpRequested(parser);
</pre>
<p>This goes against our style of not using exceptions as a part of the expected execution flow.</p>

<hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/3889#discussion_r368930085">common/src/main/java/bisq/common/config/Config.java</a>:</p>
<pre style='color:#555'>> +                            ex.getMessage()));
+        }
+    }
+
+    private Optional<OptionSet> parseOptionsFrom(File file, OptionParser parser, OptionSpec<?>... disallowedOpts) {
+        if (!file.isAbsolute() || !file.exists())
+            return Optional.empty();
+
+        ConfigFileReader configFileReader = new ConfigFileReader(file);
+        String[] optionLines = configFileReader.getOptionLines().stream()
+                .map(o -> "--" + o) // prepend dashes expected by jopt parser below
+                .collect(toList())
+                .toArray(new String[]{});
+
+        OptionSet configFileOpts = parser.parse(optionLines);
+        for (OptionSpec<?> disallowedOpt : disallowedOpts)
</pre>
<p>Prefer braces...</p>

<hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/3889#discussion_r368930224">common/src/main/java/bisq/common/config/Config.java</a>:</p>
<pre style='color:#555'>> +        }
+    }
+
+    private Optional<OptionSet> parseOptionsFrom(File file, OptionParser parser, OptionSpec<?>... disallowedOpts) {
+        if (!file.isAbsolute() || !file.exists())
+            return Optional.empty();
+
+        ConfigFileReader configFileReader = new ConfigFileReader(file);
+        String[] optionLines = configFileReader.getOptionLines().stream()
+                .map(o -> "--" + o) // prepend dashes expected by jopt parser below
+                .collect(toList())
+                .toArray(new String[]{});
+
+        OptionSet configFileOpts = parser.parse(optionLines);
+        for (OptionSpec<?> disallowedOpt : disallowedOpts)
+            if (configFileOpts.has(disallowedOpt))
</pre>
<p>...for all blocks.</p>

<hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/3889#discussion_r368931020">common/src/main/java/bisq/common/config/Config.java</a>:</p>
<pre style='color:#555'>> +
+        OptionSet configFileOpts = parser.parse(optionLines);
+        for (OptionSpec<?> disallowedOpt : disallowedOpts)
+            if (configFileOpts.has(disallowedOpt))
+                throw new IllegalArgumentException(
+                        format("The '%s' option is disallowed in config files", disallowedOpt.options().get(0)));
+
+        return Optional.of(configFileOpts);
+    }
+
+    public String getDefaultAppName() {
+        return defaultAppName;
+    }
+
+    public File getDefaultUserDataDir() {
+        if (Utilities.isWindows())
</pre>
<p>Prefer braces even for single, unbroken line blocks, but I don't think we have completely agreed on that one.</p>

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