java.lang.NullPointerException

[555555555555555]

错误信息
4e49231f WebGroup E SRVE0026E: [Servlet Error]-[]: java.lang.NullPointerException
at org.apache.jsp._header._jspService(header.jsp :8)
at com.ibm.ws.webcontainer.jsp.runtime.HttpJspBase.service(HttpJspBase.java:89)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.jsp.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:344)
at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.serviceJspFile(JspServlet.java:669)
at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.service(JspServlet.java:767)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.ServicingServletState.service(StrictLifecycleServlet.java:333)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:983)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:564)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.include(WebAppRequestDispatcher.java:253)

jsp页面

<% response.setHeader("Pragma","no-cache");
  response.setDateHeader("Expires",0);
  response.setHeader("Cache-Control","no-cache");
%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/nuchtml.tld" prefix="prenuchtml" %>
<%@ page import="com.nucleus.los.dto.common.SessionDTO" %>
<%@ page import="com.nucleus.los.dto.common.ApplicationDTO" %>
<%@ page import="com.nucleus.los.util.Format" %>
<%
	SessionDTO sessionDTO = (SessionDTO)session.getAttribute("SESSIONOBJECT");
	//String crFlag = sessionDTO.getCorpRetailFlag();
	String crFlag = sessionDTO.getCorpRetailFlag();
	//Debug下面运行到这里就停止了
	ApplicationDTO applicationDTO = (ApplicationDTO)session.getAttribute("APPLICATIONOBJECT");	
	if (applicationDTO==null)
	{
		applicationDTO = new ApplicationDTO();
	}

我以为是sessionDTO的问题，后来看了一下，sessionDTO所在得EJB项目顺利编译。jsp所在的WEB项目也把EJB放在了项目属性>Java Build Path加载的路径中。

然后运行Web项目on test server就出现了这个问题。

我又检查了struts类库，都在classpath路径下面。
还有WEB-INF/下面

环境是EJB 2.0，struts，jdk 1.4

[chenliuyang]

sessoin 里面SESSIONOBJECT 不存在。 你拿到sessionDTO 就是null咯， 去调用他的方法当然会NullPointException

[whlusha720]

没用过EJB 不过你的
ApplicationDTO applicationDTO = (ApplicationDTO)session.getAttribute("APPLICATIONOBJECT"); 是空吧 ？在哪定义的

[555555555555555]

运行到这行

String crFlag = sessionDTO.getCorpRetailFlag();

要是SPO就是这么个情况

//out.println("OK,printed.");
String crFlag = sessionDTO.getCorpRetailFlag();
//out.println("Not printed");

然后在sessionDTO得getCorpRetailFlag()方法加打印语句，控制台也看不见输出。

-所以我开始以为是EJB项目没有被WEB项目中配置，可是后来看到WEB项目属性中关于EJB的配置是正确的。