The easy way to tell what is going on is to set log4j2.debug=true before starting the application. You will see that Log4j has a default configuration that is created (see LoggerContext where the Configuration reference is set to it. If reconfiguration fails then the default configuration will continue to be used.
Ralph > On Dec 3, 2021, at 3:35 PM, Volkan Yazıcı <[email protected]> wrote: > > I think I have pulled it out: after doing a configuration.start(), > configuration.getAppenders().values().iterator().next().getLayout() does > the trick. Even though I did not specify an appender, the configuration > creates a default ConsoleAppender using the layout I have provided. Matt, > do you know the magic going on here? > > On Fri, Dec 3, 2021 at 11:24 PM Matt Sicker <[email protected]> wrote: > >> I don't think that's possible in the current plugin system without >> copying a bunch of code from AbstractConfiguration or similar. The >> code for translating configurations into objects works starting from >> the root configuration object. Ideally, the next gen plugin system >> will be able to support something along the lines of what you're >> asking for, though (i.e., being more of a generic way of configuring >> beans rather than being purely tied to a log4j configuration). >> >> On Fri, Dec 3, 2021 at 3:23 PM Volkan Yazıcı <[email protected]> wrote: >>> >>> Given a JSON snippet for configuring a layout, how can I instantiate the >>> layout class itself? I have tried the following, which "runs" without a >>> failure, but couldn't access to a layout: >>> >>> LoggerContext context = (LoggerContext) LogManager.getContext(); >>> ConfigurationSource configSource = >>> new ConfigurationSource( >>> new ByteArrayInputStream( >>> ("{'PatternLayout': {'MarkerPatternSelector': {" >> + >>> "'defaultPattern': '%m%n', " + >>> "'PatternMatch': {'key': 'FLOW', >>> 'pattern': '===%m===%n'}" + >>> "}}}") >>> .replaceAll("'", "\"") >>> .getBytes(StandardCharsets.UTF_8))); >>> JsonConfiguration configuration = new JsonConfiguration(context, >> configSource); >>> >>> Eventually I want to obtain a Layout<?> instance. Any ideas? >>
