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分享struts2 中标签中诡异的错误
我拷贝一个新页面，内容删除，就剩一个头部，可是访问这个页面时确保错了，错误原因就是因为<s:a>标签，这个标签在其他页面用过很多次，不是标签库没有导入的问题。先看一下配置文件
下面是错误提示：
<!-- BbsAction配置 -->
<action name="bbs_*" class="bbsAction" method="{1}">
<result name="list">WEB-INF/jsp/bbsaction/list.jsp</result>
<result name="show">WEB-INF/jsp/bbsaction/show.jsp</result>
</action>
<!-- replyAction配置 -->
<action name="reply_*" class="replyAction" method="{1}">
<result name="show">WEB-INF/jsp/replyaction/show.jsp</result>
</action><%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title></title>
<%@ include file="/WEB-INF/jsp/public/public.jspf" %>
<link rel="stylesheet" type="text/css" href="./style/css/forum.css" />
</head>
<body>
<div class="center">
<div class="nav">
<strong>当前位置</strong>：
<s:a action="bbs_list">BBS</s:a> //去了这一行，或者换成<a>标签就没有错误了
>>
</div>
</div>
</body>
</html>
下面是错误提示：
16:45:03,384 ERROR ClosingUIBean:27 - Could not open template
java.lang.NullPointerException
at org.apache.struts2.components.template.TemplateEngineManager.getTemplateEngine(TemplateEngineManager.java:102)
at org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:549)
at org.apache.struts2.components.ClosingUIBean.start(ClosingUIBean.java:59)
at org.apache.struts2.components.Anchor.start(Anchor.java:132)
at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:53)
at org.apache.jsp.WEB_002dINF.jsp.replyaction.show_jsp._jspx_meth_s_005fa_005f0(show_jsp.java:117)
at org.apache.jsp.WEB_002dINF.jsp.replyaction.show_jsp._jspService(show_jsp.java:86)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:154)
at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:362)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:266)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at fw.oa.util.CheckModuleInterceptor.intercept(CheckModuleInterceptor.java:29)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
...全文
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daanrk 2015-01-14
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我也遇到这错误了 简直奇葩！！！！
请叫我砖家 2014-04-23
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这种错误很好查,细心就行
空指针一看就是action有的参数没传值
既然楼主已经解决了就好好记住吧
wushangjimo 2014-04-23
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我发现昨天那个错误的原因了，在org.apache.struts2.components.UIBean.mergeTemplate（）方法中定义了一个变量theme，并且这个变量名在之后调用的方法中使用了，而我放在map中的那个key也叫theme，可能是它把我那个对象给覆盖了
wushangjimo 2014-04-23
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show()方法出的异常
wushangjimo 2014-04-23
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package fw.oa.view;
import java.util.Date;
import java.util.List;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import com.opensymphony.xwork2.ActionContext;
import fw.oa.base.BaseAction;
import fw.oa.domain.Reply;
import fw.oa.domain.Theme;
@Controller
@Scope("prototype")
public class ReplyAction extends BaseAction<Reply> {
private static final long serialVersionUID = 1L;
private Long themeId;
public String show() throws Exception {
Theme theme = themeService.findById(themeId);
List<Reply> replyLists = replyService.findAllByThemeId(theme);
ActionContext.getContext().put("themes", theme);
ActionContext.getContext().put("forumId", theme.getForum().getId());
ActionContext.getContext().put("replyLists", replyLists);
return "show";
}
public String save() throws Exception {
Theme theme = themeService.findById(themeId);
model.setTheme(theme);
model.setAuthor(getCurrentUser());
model.setCreateTime(new Date());
model.setStory(theme.getReplyNum() + 1);
model.setStatus('0');
theme.setReplyNum(theme.getReplyNum() + 1);
theme.setLastUpdateTime(new Date());
theme.setLastReply(model);
replyService.save(model);
return "toShow";
}
public Long getThemeId() {
return themeId;
}
public void setThemeId(Long themeId) {
this.themeId = themeId;
}
}
maxldwy 2014-04-23
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这个问题我已经解决了，就是把action中放入map中的一个key的名字改了一下就OK了，但是这个错误有在另一个请求中出现了，一模一样的错误，再怎么改key的名字都不行，真是郁闷死了
[/quote]
能把你action里的bbs_list方法贴出来么？就跟楼上说的你肯定是方法里出现空指针了 写代码的时候注意多加一些异常或者条件判断 用来提高你代码的健壮性
[/quote]
能把你action里的bbs_list方法贴出来么？就跟楼上说的你肯定是方法里出现空指针了 写代码的时候注意多加一些异常或者条件判断 用来提高你代码的健壮性
tony4geek 2014-04-23
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wushangjimo 2014-04-23
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这个问题我已经解决了，就是把action中放入map中的一个key的名字改了一下就OK了，但是这个错误有在另一个请求中出现了，一模一样的错误，再怎么改key的名字都不行，真是郁闷死了
maxldwy 2014-04-23
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试试<s:a href="bbs_list">BBS</s:a>
wushangjimo 2014-04-23
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难道没有人遇到过这样的错误吗？那我也太幸运了吧
wushangjimo 2014-04-23
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已经确定了，不是我代码的问题，就是一个bean的一个属性名和struts后台程序中的名字重复，我更名之后就没有这个问题了，大家以后用的时候也不要用这个变量名了（theme）。
结贴给分
maxldwy 2014-04-23
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找到了就好 换个名吧
wushangjimo 2014-04-22
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这个有，在include里面呢，其他页面也是这么用的，都没有问题
maxldwy 2014-04-22
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页面没引用标签？
<%@taglib uri="/struts-tags" prefix="s" %>wushangjimo 2014-04-22
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江湖救急，在线等，大虾们赶紧出手
