移植到jboss發生的jsp錯誤

將應用從tomcat5.5移植到jboss環境下
個別jsp文件報錯：
如下
The method setAttribute(String, Object, int) in the type JspContext is not applicable for the arguments (String, int)


org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063)
org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1001)
org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:966)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:204)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

jboss內嵌了tomcat容器，似乎有些jar包還是跟正式的tomcat有些區別
上述問題是在pageContext.setAttribute("size",size);
這裏報錯的。
換成 pageContext.setAttribute("size",new Integer(size));通過。
但是在純tomcat環境下，是正常的。