Below given is the Java configuration class for DbAppender.

@Configuration
public class LogbackConfiguration {
@Bean 
public DBAppender dbAppender(DataSource ds){     
DBAppender dbAppender = new DBAppender();      
LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory(); Logger logger = loggerContext.getLogger("org.zalando.logbook"); loggerContext.start(); 
DataSourceConnectionSource connectionSource = new DataSourceConnectionSource();   connectionSource.setDataSource(ds ); 
connectionSource.setContext(loggerContext); 
connectionSource.start(); 
dbAppender.setConnectionSource(connectionSource); 
dbAppender.start(); 
logger.addAppender(dbAppender);
return dbAppender; 
}}

I have another configuration class that has configuration properties and the values of those properties can be changed dynamically. I'm using the @RefreshScope (org.springframework.cloud.context.config.annotation.RefreshScope) annotation to get the new values of the config properties on the fly.

The DBAppender works fine, except when I make any changes to any of the configuration properties externally (changing the value of an existing property or adding a new config property in Consul) while the app is running. 

After I make any changes to any config property externally, the DbAppender stops logging into the DB table. Console logger continues to work fine. No error/exception message. I will have to restart the app everytime after I change a config value to get the DbAppender working.