## 源码

    public static final String CLIENT_LOG_USESLF4J = "rocketmq.client.logUseSlf4j";
    public static final String CLIENT_LOG_ROOT = "rocketmq.client.logRoot";
    public static final String CLIENT_LOG_MAXINDEX = "rocketmq.client.logFileMaxIndex";
    public static final String CLIENT_LOG_FILESIZE = "rocketmq.client.logFileMaxSize";
    public static final String CLIENT_LOG_LEVEL = "rocketmq.client.logLevel";
    public static final String CLIENT_LOG_ADDITIVE = "rocketmq.client.log.additive";
    public static final String CLIENT_LOG_FILENAME = "rocketmq.client.logFileName";
    public static final String CLIENT_LOG_ASYNC_QUEUESIZE = "rocketmq.client.logAsyncQueueSize";
    public static final String ROCKETMQ_CLIENT_APPENDER_NAME = "RocketmqClientAppender";

    private static final InternalLogger CLIENT_LOGGER;

    private static final boolean CLIENT_USE_SLF4J;

    //private static Appender rocketmqClientAppender = null;

    static {
        CLIENT_USE_SLF4J = Boolean.parseBoolean(System.getProperty(CLIENT_LOG_USESLF4J, "false"));
        if (!CLIENT_USE_SLF4J) {
            InternalLoggerFactory.setCurrentLoggerType(InnerLoggerFactory.LOGGER_INNER);
            CLIENT_LOGGER = createLogger(LoggerName.CLIENT_LOGGER_NAME);
            createLogger(LoggerName.COMMON_LOGGER_NAME);
            createLogger(RemotingHelper.ROCKETMQ_REMOTING);
        } else {
            CLIENT_LOGGER = InternalLoggerFactory.getLogger(LoggerName.CLIENT_LOGGER_NAME);
        }
    }

## 分析
rocketmq-client默认rocketmq.client.logUseSlf4j为false，导致创建了一个新的logger对象，脱离了全局使用的logger，导致log4j2.xml配置对其无效；

## 解决方案
1. 代码中增加初始化代码，指定slfj4

System.setProperty("rocketmq.client.logUseSlf4j", "true");

2. 应用启动时，新增

-Drocketmq.client.logUseSlf4j=true