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java.lang.NullPointerException: 	at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:49)	at org.apache.jsp.decorators.default_jsp._jspx_meth_s_005fif_005f0(default_jsp.java:663)	at org.apache.jsp.decorators.default_jsp._jspService(default_jsp.java:230)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)