code: public static synchronized Properties getConfig() {
          if (config == null) {
              try {
                  String rpcConfig = "config/rpc-config.properties";
                  InputStream ins = SofaConfigs.class.getClassLoader().getResourceAsStream(rpcConfig);
                  if (ins == null) {
                      ins = Thread.currentThread().getContextClassLoader()
                          .getResourceAsStream(rpcConfig);
                  }
  
                  config = new Properties();
                  config.load(ins);
              } catch (Exception e) {
                  config = new Properties();
                  if (LOGGER.isDebugEnabled()) {
                      LOGGER.debug(LogCodes.getLog(LogCodes.ERROR_RPC_CONFIG_LOAD));
                  }
              }
          }
  
          return config;
      }
docs: 初始化 config/rpc-config.properties
  初始化失败时，直接报错
  
  @return 配置内容