以下是我希望引用registerViewTwo.jsp
的视图<%@page import="java.util.Calendar"%>
<%@page import="net.tanesha.recaptcha.ReCaptcha"%>
<%@page import="net.tanesha.recaptcha.ReCaptchaFactory"%>
<%@page import="com.ewusu.util.Props"%>
<head>
<title>Register</title>
</head>
<jsp:directive.include file="includes/top.jsp" />
<form:form method="post" id="fm1" cssClass="fm-v clearfix" commandName="${commandName}" htmlEscape="true">
<table style="padding-top: 10px; padding-bottom: 20px;">
<tr><td>First Name:</td><td> <form:input cssClass="required" cssErrorClass="error" id="firstname" size="50"
path="firstname" autocomplete="false" htmlEscape="true" /></td> <td><form:errors path="firstname" cssClass="errors" /></td> </tr>
<tr> <td>Last Name:</td> <td><form:input cssClass="required" cssErrorClass="error" id="lastname" size="50"
path="lastname" autocomplete="false" htmlEscape="true" /></td> <td><form:errors path="lastname" cssClass="errors" /></td> </tr>
<tr> <td>Email:</td> <td><form:input cssClass="required" cssErrorClass="error" id="emailaddress" size="50"
path="emailaddress" autocomplete="false" htmlEscape="true" /></td> <td><form:errors path="emailaddress" cssClass="errors" /></td> </tr>
<tr> <td>Password:</td> <td><form:password cssClass="required" cssErrorClass="error" id="password" size="50"
path="password" autocomplete="false" htmlEscape="true" /></td> <td><form:errors path="password" cssClass="errors" /></td> </tr>
<tr> <td>Gender:</td>
<td><form:select path="gender">
<form:option value="NONE" label="- Select Gender -"/>
<form:option value="Male" label="Male"/>
<form:option value="Female" label="Female"/>
</form:select></td>
<td><form:errors path="gender" cssClass="errors" /></td> </tr>
<tr> <td>Birthday:</td>
<td><form:select path="day">
<form:option value="0" label="- Day: -"/>
<% for(int i = 1; i <= 31; i++) { %>
<form:option value="<%=i %>" label="<%=String.valueOf(i) %>"/>
<% }%>
</form:select>
<form:select path="month">
<form:option value="0" label="- Month: -"/>
<%
String[] months = new String[] {
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
for(int i = 0; i < months.length; i++) {
%>
<form:option value="<%=i+1 %>" label="<%=months[i] %>"/>
<% } %>
</form:select>
<form:select path="year">
<form:option value="0" label="- Year: -"/>
<%
int year = Calendar.getInstance().get(Calendar.YEAR) - 5;//seriously how many 5 yrs olds use the net?!?
int minYear = year - 90; //sure 80 year olds have better things to do with their time
for(; year >= minYear; year--) {
%>
<form:option value="<%=year %>" label="<%=String.valueOf(year) %>"/>
<% } %>
</form:select></td>
<td><form:errors path="day" cssClass="errors" /></td>
</tr>
<tr> <td>Remember me:</td>
<td><form:checkbox path="rememberLogin" value="1"/></td>
<td><form:errors path="rememberLogin" cssClass="errors" /></td>
</tr>
</table>
<%
ReCaptcha c = ReCaptchaFactory.newReCaptcha(Props.PUBLIC_RECAPTCHA_KEY, Props.PRIVATE_RECAPTCHA_KEY, false);
out.print(c.createRecaptchaHtml(null, null));
%>
<form:errors path="recaptcha" cssClass="errors"/>
<div>
<span style="padding-right: 10"> <input class="btn-submit" type="submit" name="_eventId_submit" value="submit" /> </span>
<span> <input class="btn-submit" type="submit" name="_eventId_cancel" value="cancel"/> </span>
</div>
<input type="hidden" name="lt" value="${flowExecutionKey}" />
</form:form>
<jsp:directive.include file="includes/bottom.jsp" />
这是web.xml文件cas servlet mapping
**<servlet-mapping>
<servlet-name>cas</servlet-name>
<url-pattern>/register</url-pattern>
</servlet-mapping>
<!-- Added reguser servlet mapping 4th May 2014 -->
<servlet-mapping>
<servlet-name>cas</servlet-name>
<url-pattern>/reguser</url-pattern>
</servlet-mapping>**
<!-- Section removed to fit Stackoverflow -->
<session-config>
<!-- Default to 5 minute session timeouts -->
<session-timeout>5</session-timeout>
</session-config>
以下是我的cas-servlet.xml文件的一个片段，它将url reguser映射到webflow registertwo-webflow.xml
<bean class="org.springframework.webflow.mvc.servlet.FlowHandlerAdapter"
p:flowExecutor-ref="flowExecutor"
p:flowUrlHandler-ref="flowUrlHandler" />
<bean id="flowUrlHandler" class="org.jasig.cas.web.flow.CasDefaultFlowUrlHandler" />
<webflow:flow-executor id="flowExecutor" flow-registry="flowRegistry">
<webflow:flow-execution-attributes>
<webflow:always-redirect-on-pause value="false" />
</webflow:flow-execution-attributes>
</webflow:flow-executor>
<webflow:flow-registry id="flowRegistry" flow-builder-services="builder">
<webflow:flow-location path="/WEB-INF/login-webflow.xml" id="login" />
<webflow:flow-location path="/WEB-INF/remind-webflow.xml" id="remind" />
<webflow:flow-location path="/WEB-INF/register-webflow.xml" id="register" />
<!-- Added new register for Customer and Spec 4th May 2014 -->
**<webflow:flow-location path="/WEB-INF/registertwo-webflow.xml" id="reguser" />**
<webflow:flow-location path="/WEB-INF/update-webflow.xml" id="update" />
</webflow:flow-registry>
这是我的webflow xml文件registertwo-webflow.xml，我试图在此文件中显示的倒数第二行调用registerViewTwo.jsp。
<?xml version="1.0" encoding="UTF-8"?>
<flow xmlns="http://www.springframework.org/schema/webflow"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/webflow
http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">
<on-start>
<evaluate expression="initialFlowSetupAction" />
</on-start>
<!-- VIEW STATES -->
<view-state id="register" view="registerViewTwo" model="customer">
<!-- <var name="customer" class="com.ewusu.model.Customer"/> -->
我试图在registertwo-webflow寄存器状态中调用registerTwoView.jsp，但是当我启动Tomcat webserver并尝试访问相关的URL时，我收到一个空指针异常（见下文）
SEVERE: Servlet.service() for servlet [cas] in context with path [/sso] threw exception [Request processing failed; nested exception is org.springframework.webflow.execution.FlowExecutionException: Exception thrown in state 'register' of flow 'reguser'] with root cause
java.lang.NullPointerException
at org.springframework.webflow.mvc.servlet.ServletMvcView.doRender(ServletMvcView.java:50)
at org.springframework.webflow.mvc.view.AbstractMvcView.render(AbstractMvcView.java:180)
at org.springframework.webflow.engine.ViewState.render(ViewState.java:314)
at org.springframework.webflow.engine.ViewState.doEnter(ViewState.java:208)
at org.springframework.webflow.engine.State.enter(State.java:194)
at org.springframework.webflow.engine.Flow.start(Flow.java:535)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:364)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.start
奇怪的是，可以使用registertwo-webflow.xml文件访问现有的registerView.jsp。我希望我提供了足够的信息，因为我无法理解什么是错误的