Problem with Log4j2 Configurator initialize in spring boot - spring-boot

Question

I'm working on a spring boot project, which use log4j2 for logging. The log4j2.xml is stored in DB, so I have to retrieve it before using.
It looks like below:
<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
<!-- setting -->
<Properties>
<Property name="merchantdb">/syslog/translog/merchantdb/</Property>
<Property name="pattern1">%d{yyyy-MM-dd HH:mm:ss}[%5p][%C{2}][%t] %m%n</Property>
<Property name="pattern2">%d{yyyy-MM-dd HH:mm:ss}[%5p][%C{2}.%M()] %m%n</Property>
</Properties>
<!-- appender setting -->
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="${pattern1}"/>
</Console>
<RollingFile name="merchantdb" filePattern="${merchantdb}/merchantdb.log.%d{yyyy-MM-dd}">
<PatternLayout pattern="${pattern1}"/>
<Policies>
<TimeBasedTriggeringPolicy interval="1"/>
</Policies>
<DirectWriteRolloverStrategy/>
</RollingFile>
<RollingFile name="merchantdb_io" filePattern="${merchantdb}/merchantdb_io.log.%d{yyyy-MM-dd}">
<PatternLayout pattern="${pattern2}"/>
<Policies>
<TimeBasedTriggeringPolicy interval="1"/>
</Policies>
<DirectWriteRolloverStrategy/>
</RollingFile>
<RollingFile name="merchantdb_i" filePattern="${merchantdb}/merchantdb_i.log.%d{yyyy-MM-dd}">
<PatternLayout pattern="${pattern2}"/>
<Policies>
<TimeBasedTriggeringPolicy interval="1"/>
</Policies>
<DirectWriteRolloverStrategy/>
</RollingFile>
<RollingFile name="merchantdb_o" filePattern="${merchantdb}/merchantdb_o.log.%d{yyyy-MM-dd}">
<PatternLayout pattern="${pattern2}"/>
<Policies>
<TimeBasedTriggeringPolicy interval="1"/>
</Policies>
<DirectWriteRolloverStrategy/>
</RollingFile>
<RollingFile name="rmds" filePattern="${merchantdb}/rmds.log.%d{yyyy-MM-dd}">
<PatternLayout pattern="${pattern2}"/>
<Policies>
<TimeBasedTriggeringPolicy interval="1"/>
</Policies>
<DirectWriteRolloverStrategy/>
</RollingFile>
<Socket name="socket" host="10.77.249.230" port="20002" reconnectionDelay="5000" immediateFlush="true">
<JsonLayout compact="true" includeStacktrace="true" charset="UTF-8" eventEol="true" locationInfo="true" objectMessageAsJsonObject="true" stacktraceAsString="true">
<KeyValuePair key="hostName" value="$${hostName}"/>
</JsonLayout>
</Socket>
</Appenders>
<Loggers>
<Logger name="merchantdb" level="all" additivity="false">
<AppenderRef ref="merchantdb"/>
<AppenderRef ref="Console"/>
<AppenderRef ref="socket"/>
</Logger>
<Logger name="merchantdb_io" level="all" additivity="false">
<AppenderRef ref="merchantdb_io"/>
<AppenderRef ref="Console"/>
<AppenderRef ref="socket"/>
</Logger>
<Logger name="merchantdb_i" level="all" additivity="false">
<AppenderRef ref="merchantdb_i"/>
<AppenderRef ref="Console"/>
<AppenderRef ref="socket"/>
</Logger>
<Logger name="merchantdb_o" level="all" additivity="false">
<AppenderRef ref="merchantdb_o"/>
<AppenderRef ref="Console"/>
<AppenderRef ref="socket"/>
</Logger>
<Logger name="com.alibaba.druid.pool" level="all" additivity="false">
<AppenderRef ref="rmds"/>
</Logger>
</Loggers>
</Configuration>
I know there are multiple ways to initialize *.xml. It did work when using URI to initialize. However, I found myself having problem with initialize with ConfigurationSource. It seems the config doesn't set properly when using ConfigurationSource, logger still print in default format.
Below is my code, is there anything that I miss?
Thanks a lot.
#Configuration
public class ConfigLoader {
public static Logger logger;
#Bean
#DependsOn("ds_settingsDB")
public Logger log4j2() throws IOException {
System.out.println("loading Log4j2");
FileWriter fw = null;
LoggerContext context = null;
try {
String fieldvalue = SettingsDB.get("Log4J2.xml");
//initBySource(fieldvalue); //this doesn't works
initByFilePath(fieldvalue); //this works
logger = LogManager.getFormatterLogger("merchantdb");
logger.info("log4j2 load complete");
return logger;
}catch(Exception e) {
throw new EipException(e);
} finally {
if(fw!=null){
fw.close();
}
}
}
private LoggerContext initBySource(String fieldvalue) throws Exception {
InputStream in = new ByteArrayInputStream(fieldvalue.getBytes("utf-8"));
ConfigurationSource source = new ConfigurationSource(in);
LoggerContext ctx = Configurator.initialize(null, source);
return ctx;
}
private LoggerContext initByFilePath(String fieldvalue) throws Exception {
FileWriter fw = null;
LoggerContext ctx = null;
String filePath = "C:\\apconf\\log4j2zzz.xml";
fw = new FileWriter(filePath);
fw.write(fieldvalue);
fw.flush();
File file = new File(filePath);
if(file.exists()){
ctx = Configurator.initialize(null, filePath);
}
return ctx;
}
}