apollo-client/src/main/java/com/ctrip/framework/apollo/spring/util/SpringInjector.java/SpringInjector/getInjector
class SpringInjector:  private static Injector getInjector() {
    if (s_injector == null) {
      synchronized (lock) {
        if (s_injector == null) {
          try {
            s_injector = Guice.createInjector(new SpringModule());
          } catch (Throwable ex) {
            ApolloConfigException exception = new ApolloConfigException("Unable to initialize Apollo Spring Injector!", ex);
            Tracer.logError(exception);
            throw exception;
          }
        }
      }
    }

    return s_injector;
  }