wro4j-core/src/main/java/ro/isdc/wro/manager/factory/DefaultWroManagerFactory.java
private WroManagerFactory initFactory(final Properties properties) {
    WroManagerFactory factory = null;
    final String wroManagerClassName = properties.getProperty(ConfigConstants.managerFactoryClassName.name());
    if (StringUtils.isEmpty(wroManagerClassName)) {
      // If no context param was specified we return the default factory
      factory = newManagerFactory();
    } else {
      // Try to find the specified factory class
      Class<?> factoryClass = null;
      try {
        factoryClass = Thread.currentThread().getContextClassLoader().loadClass(wroManagerClassName);
        factory = (WroManagerFactory) factoryClass.newInstance();
      } catch (final Exception e) {
        throw new WroRuntimeException("Exception while loading WroManagerFactory class:" + wroManagerClassName, e);
      }
    }
    // add properties if required
    if (factory instanceof ConfigurableWroManagerFactory) {
      ((ConfigurableWroManagerFactory) factory).addConfigProperties(properties);
    }
    return factory;
  }
private WroManagerFactory initFactory(final Properties properties) {
    WroManagerFactory factory = null;
    final String wroManagerClassName = properties.getProperty(ConfigConstants.managerFactoryClassName.name());
    if (StringUtils.isEmpty(wroManagerClassName)) {
      // If no context param was specified we return the default factory
      factory = newManagerFactory();
    } else {
      // Try to find the specified factory class
      Class<?> factoryClass = null;
      try {
        factoryClass = Thread.currentThread().getContextClassLoader().loadClass(wroManagerClassName);
        factory = (WroManagerFactory) factoryClass.newInstance();
      } catch (final Exception e) {
        throw new WroRuntimeException("Exception while loading WroManagerFactory class:" + wroManagerClassName, e);
      }
    }
    // add properties if required
    if (factory instanceof ConfigurableWroManagerFactory) {
      ((ConfigurableWroManagerFactory) factory).addConfigProperties(properties);
    }
    return factory;
  }
Initialized inner factory based on provided configuration.