Initialize default Locale and Timezone with Spring configuration

Question

I\'m loading application settings such as JDBC connection info from a properties file using PropertyPlaceholderConfigurer. I\'d like to also have other settings

Answer 1

I found Spring loads some of its default beans including other beans before calling the contextInitialized method, so, here is a better approach "draft" that I can think of, let me know if you see any concern:

public class SystemPropertyDefaultsInitializer 
    implements WebApplicationInitializer{

    private static final Logger logger = Logger
            .getLogger(SystemPropertyDefaultsInitializer.class);

    @Override
    public void onStartup(ServletContext servletContext)
            throws ServletException {
        logger.info("SystemPropertyWebApplicationInitializer onStartup called");

        // can be set runtime before Spring instantiates any beans
        // TimeZone.setDefault(TimeZone.getTimeZone("GMT+00:00"));
        TimeZone.setDefault(TimeZone.getTimeZone("UTC"));

        // cannot override encoding in Spring at runtime as some strings have already been read
        // however, we can assert and ensure right values are loaded here

        // verify system property is set
        Assert.isTrue("UTF-8".equals(System.getProperty("file.encoding")));

        // and actually verify it is being used
        Charset charset = Charset.defaultCharset();
        Assert.isTrue(charset.equals(Charset.forName("UTF-8")));

        // locale
        // set and verify language

    }

}