Most often, the Action Mappings will be automatically reloaded if the WAR is redeployed. If not, there are two things you can try: Setting the reload property to true and destroying the configuration.

Setting Reload to True

### Configuration reloading
### This will cause the configuration to reload struts.xml when it is changed
struts.configuration.xml.reload=true

Reloading the Configuration

Create a utility Action that calls reload.

// ...
String execute() {
  Dispatcher.getIntance().getConfigurationManager().reload();
  return SUCCESS;
}

Invoking reload will force Struts to reload the configuration.