18:58:45,418 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [/home/ubuntu/build-target/restapilayer/restapilayer.logback.xml] at [file:/home/ubuntu/build-target/restapilayer/restapilayer.logback.xml]
18:58:45,608 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
18:58:45,611 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [CONSOLE]
18:58:45,617 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
18:58:45,645 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG
18:58:45,645 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [CONSOLE] to Logger[ROOT]
18:58:45,646 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
18:58:45,646 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@614ddd49 - Registering current configuration as safe fallback point
INFO [2018-01-12 18:58:45] c.v.c.u.CommonUtils:[c.v.c.u.CommonUtils:addDefaultExceptionHandler:1876] - [main][CommonUtils.java:1876] - adding uncaught exception handler hook...
log4j: Default initialization of overridden by log4j.defaultInitOverrideproperty.
log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
INFO [2018-01-12 18:58:47] o.e.j.u.log:[?:?:?] - [main] - Logging initialized @2260ms

I am using logback 1.2.3. I am passing the logback configuration as -Dlogback.configurationFile=$SERVICE_PATH/restapilayer.logback.xml

My restapilayer.logback.xml looks like below

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>
                %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
            </Pattern>
        </layout>
    </appender>

    <root level="DEBUG">
        <appender-ref ref="STDOUT" />
    </root>

</configuration>

In my logs also I am seeing the configuration file being loaded.

16:25:32,564 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [/home/ubuntu/build-target/restapilayer/restapilayer.logback.xml] at [file:/home/ubuntu/build-target/restapilayer/restapilayer.logback.xml]
16:25:32,705 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
16:25:32,706 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
16:25:32,716 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT]
16:25:32,798 |-WARN in ch.qos.logback.core.ConsoleAppender[STDOUT] - This appender no longer admits a layout as a sub-component, set an encoder instead.
16:25:32,798 |-WARN in ch.qos.logback.core.ConsoleAppender[STDOUT] - To ensure compatibility, wrapping your layout in LayoutWrappingEncoder.
16:25:32,798 |-WARN in ch.qos.logback.core.ConsoleAppender[STDOUT] - See also http://logback.qos.ch/codes.html#layoutInsteadOfEncoder for details
16:25:32,799 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG
16:25:32,799 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT]
16:25:32,800 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
16:25:32,801 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@76707e36 - Registering current configuration as safe fallback point

2018-01-12 16:25:32 [main] INFO  com.vnera.common.utils.CommonUtils - adding uncaught exception handler hook...
log4j: Default initialization of overridden by log4j.defaultInitOverrideproperty.
log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
INFO [2018-01-12 16:25:34] o.e.j.u.log:[?:?:?] - [main] - Logging initialized @1909ms

Then while trying to log I am seeing the logback configuration as null and it seems logback is running with default config

INFO [2018-01-12 16:25:34] c.v.r.c.v.r.VneraBackendService:[?:?:?] - [main] - Logback used _null_ as the configuration file_

I am using the below code to get the logback config

logger.debug("Testing Debug logging");
LoggerContext loggerContext = ((ch.qos.logback.classic.Logger)logger).getLoggerContext();
URL mainURL = ConfigurationWatchListUtil.getMainWatchURL(loggerContext);
System.out.println(mainURL);
// or even
logger.info("Logback used '{}' as the configuration file.", mainURL);

Can someone let me know what is going wrong? How can I debug this issue?