The default folder of resourses is not correct in Eclipse JBoss studio, please put it under webapp folder(outside of web-inf folder) and adding the following things in the application context file in spring xml:
<mvc:resources mapping="/resources/**" location="/resources/" />
<mvc:annotation-driven />
remember to modify every link in html files to make sure it comply the location specified in the above position:
like this:
<link href="<c:url value="/resources/css/bootstrap.css" />" rel="stylesheet" type="text/css" />