Add DEFAULT_PARAM to HttpHeaderResult

2013-01-16 09:25:59 main XmlConfigurationProvider [DEBUG] The result type org.apache.struts2.dispatcher.HttpHeaderResult doesn't have a default param [DEFAULT_PARAM] defined
java.lang.NoSuchFieldException: DEFAULT_PARAM
	at java.lang.Class.getField(Class.java:1520)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addResultTypes(XmlConfigurationProvider.java:569)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:521)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:292)
	at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)
	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:239)