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Log4j: is it synchronized for multithreaded calls?
void someFunction()
{
Log.info("entered some function");
...

Log.info("existed some function");
}

public void info(Object message) {
    if(repository.isDisabled(Level.INFO_INT))
       return;
    if(Level.INFO.isGreaterOrEqual(this.getEffectiveLevel()))
       forcedLog(FQCN, Level.INFO, message, null);
}

...

protected void forcedLog(String fqcn, Priority level, Object message, Throwable t) {
    callAppenders(new LoggingEvent(fqcn, this, level, message, t));
}

...

public void callAppenders(LoggingEvent event) {
    int writes = 0;

    for(Category c = this; c != null; c=c.parent) {
        // Protected against simultaneous call to addAppender, removeAppender,...
        synchronized(c) {
            if(c.aai != null) {
                writes += c.aai.appendLoopOnAppenders(event);
            }
            if(!c.additive) {
                break;
            }
        }
    }

    if(writes == 0) {
        repository.emitNoAppenderWarning(this);
    }
}