问题描述
我正在使用Grails 2.2.3来清除数据库中的重复人员。当我尝试访问控制器操作时，我收到以下错误消息：
错误由org.codehaus.groovy.grails.web引起.servlet.mvc.exceptions.CannotRedirectException：无法在此处发出重定向（..）。先前调用重定向（..）已经重定向了响应。
它看起来像一个无限重定向循环，因为Stacktrace在一旦我进入 duplicate（）操作，控制台就会变得疯狂。它一直保持打印状态，直到我从控制台中取出 Ctrl + C 。此外，还有多个屏幕用于处理重复并修复它，这就是为什么我要存储工作重复的方式。
控制器操作：
-
setWorkingDuplicate- 设置重复以使用（因此用户不必继续输入）。 -
重复- 查看重复或，如果没有session.id，用户找到重复表单 - <$
$ p>直接进入duplicate（）页面时发生错误。如果我先设置工作副本，则不会发生重定向问题。
以下是导致此问题的控制器操作。
def setWorkingDuplicate（Integer id）{
if（id& amp; Duplicate.get（id））{
session.id = id
flash.message =工作重复设置为ID $ {id}
重定向操作：'getDuplicate'，params：[id：session.id]
}
}
def duplicate（）{
if（session.id）{
redirect（action：'getDuplicate'，params：[id：session.id]）
return
render view：'duplicate'
}
def getDuplicate（Integer id）{
def duplicate = Duplicate.get（id）
if（！duplicate）{
flash.message =重复找不到ID $ {id}。
render（view：'duplicate'）
return
}
render view：'duplicate'，model：[duplicate：duplicate]
}
有人知道这可能是什么原因吗？
错误导致：java .lang.StackOverflowError
和
WARN：Exception：java.lang.reflect.InvocationTargetException
堆栈跟踪，以下错误不断重复：
| edu.mssu.duplicates.InitialStepsController.render错误（InitialStepsController.groovy）
| edu.mssu.duplicates.InitialStepsController中的错误$ render.callCurrent（Unknown Source）
| edu.mssu.duplicates.InitialStepsController.getDuplicate错误（InitialStepsController.groovy：69）
| edu.mssu.duplicates.InitialStepsController.getDuplicate错误（InitialStepsController.groovy）
|错误在sun.reflect.GeneratedMethodAccessor382.invoke（未知源）
|错误在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）
| java.lang.reflect.Method.invoke（Method.java:601）
|错误org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke（ReflectiveInterceptor.java:1259）
| org.apache.commons.beanutils.BeanMap.get（BeanMap.java:390）
| org.apache.commons.beanutils.BeanMap $ 12.next（BeanMap.java:565）
| org.apache.commons.collections.iterators.UnmodifiableIterator.next（UnmodifiableIterator.java:72）
| java.util.HashMap.putAll（HashMap.java:621）
|时出错org.springframework.ui.ModelMap.addAllAttributes错误（ModelMap.java:117）
| org.springframework.web.servlet.ModelAndView。< init>（ModelAndView.java:97）
| org.codehaus.groovy.grails.web.metaclass.RenderDynamicMethod.renderView（RenderDynamicMethod.java:485）出现错误
| org.codehaus.groovy.grails.web.metaclass.RenderDynamicMethod.invoke（RenderDynamicMethod.java:187）中的错误
| org.codehaus.groovy.grails.plugins.web.api.ControllersApi.invokeRender（ControllersApi.java:258）
| org.codehaus.groovy.grails.plugins.web.api.ControllersApi.render（ControllersApi.java:246）
$ b错误$ b这是我的重复GSP（非常精简版）的版本。 GSP提供了一种快速搜索/显示/更新复制并在一页中显示该复制的方法。因此，搜索框和显示表单。
<％@ page contentType =text / html; charset = UTF-8 ％GT;
< html>
< head>
< / head>
< body>
< h1>重复< / h1>
< label for =id>重复ID< / label> < g：textField name =idvalue =$ {duplicate？.id}/>
< / g：表格>
//表单内容
< g：hiddenField name =idvalue =$ {duplicate？.id}/>
< / g：表格>
< / g：if>
< / body>
< / html>
解决方案在命名之前，我遇到了一些非常奇怪的问题控制器匹配一些其他对象或以'get'开始
尝试重命名：
def getDuplicate（Integer id） code>
到完全不同的东西，例如：def myDupe（Integer id）
对不起我不能给你一个更好的解释，但我已经做了几次，只是为了让事情有效。
I am using Grails 2.2.3 for an app to clear out Duplicate persons in our Database. When I attempt to access a controller action, I am receiving the following error:
Error Caused by: org.codehaus.groovy.grails.web.servlet.mvc.exceptions.CannotRedirectException: Cannot issue a redirect(..) here. A previous call to redirect(..) has already redirected the response.It looks like an infinite redirect loop, because the Stacktrace in the console just goes bonkers as soon as I go to the
duplicate()action. It keeps printing until ICtrl+Cout of the console. Also, there are multiple screens for working with a Duplicate and fixing it, which is why I am giving a way to store the "working" Duplicate.The controller actions:
setWorkingDuplicate- set a duplicate to work with on each page (so a user doesn't have to keep typing it in).duplicate- view a duplicate or, if there is nosession.id,present the user with find duplicate formgetDuplicate(action only) - gets a duplicate and renders the duplicate page
The error is occurring when I go straight to the duplicate() page. If I set the working duplicate first, no redirect issues happen.
Here are the controller actions that are causing the issue.
def setWorkingDuplicate(Integer id) { if (id && Duplicate.get(id)) { session.id = id flash.message = "Working Duplicate set to ID ${id}" redirect action: 'getDuplicate', params: [id: session.id] } } def duplicate() { if (session.id) { redirect(action: 'getDuplicate', params: [id: session.id]) return } render view: 'duplicate' } def getDuplicate(Integer id) { def duplicate = Duplicate.get(id) if (!duplicate) { flash.message = "Duplicate not found with ID ${id}." render(view: 'duplicate') return } render view: 'duplicate', model: [duplicate: duplicate] }Does anyone know what might be causing this?
Edit: it looks like somewhere down in the stack trace I am also receiving the following errors.
Error Caused by: java.lang.StackOverflowErrorand
WARN: Exception: java.lang.reflect.InvocationTargetExceptionAnd in the stack trace, the following errors keep repeating over and over:
| Error at edu.mssu.duplicates.InitialStepsController.render(InitialStepsController.groovy) | Error at edu.mssu.duplicates.InitialStepsController$render.callCurrent(Unknown Source) | Error at edu.mssu.duplicates.InitialStepsController.getDuplicate(InitialStepsController.groovy:69) | Error at edu.mssu.duplicates.InitialStepsController.getDuplicate(InitialStepsController.groovy) | Error at sun.reflect.GeneratedMethodAccessor382.invoke(Unknown Source) | Error at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) | Error at java.lang.reflect.Method.invoke(Method.java:601) | Error at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1259) | Error at org.apache.commons.beanutils.BeanMap.get(BeanMap.java:390) | Error at org.apache.commons.beanutils.BeanMap$12.next(BeanMap.java:565) | Error at org.apache.commons.collections.iterators.UnmodifiableIterator.next(UnmodifiableIterator.java:72) | Error at java.util.HashMap.putAll(HashMap.java:621) | Error at org.springframework.ui.ModelMap.addAllAttributes(ModelMap.java:117) | Error at org.springframework.web.servlet.ModelAndView.<init>(ModelAndView.java:97) | Error at org.codehaus.groovy.grails.web.metaclass.RenderDynamicMethod.renderView(RenderDynamicMethod.java:485) | Error at org.codehaus.groovy.grails.web.metaclass.RenderDynamicMethod.invoke(RenderDynamicMethod.java:187) | Error at org.codehaus.groovy.grails.plugins.web.api.ControllersApi.invokeRender(ControllersApi.java:258) | Error at org.codehaus.groovy.grails.plugins.web.api.ControllersApi.render(ControllersApi.java:246)This is a (very stripped down) version of my Duplicate GSP. The GSP presents a way to quickly search/show/update a Duplicate and display that Duplicate, all in one page. Hence the search box and show form.
<%@ page contentType="text/html;charset=UTF-8" %> <html> <head> </head> <body> <h1>Duplicate</h1> <g:form action="duplicate" method="POST"> <label for="id">Duplicate ID</label> <g:textField name="id" value="${duplicate?.id}" /> <g:submitButton name="btnRetrieveDuplicate" value="Retrieve Duplicate" /> </g:form> <g:if test="${duplicate}"> <g:form action="updateDuplicate" method="POST"> //Form stuff <g:hiddenField name="id" value="${duplicate?.id}" /> </g:form> </g:if> </body> </html>解决方案I've had some really strange issues before when naming controllers matched some other objects or started with 'get'
Try renaming:
def getDuplicate(Integer id)to something completely different like:def myDupe(Integer id)Sorry I can't give you a better explanation, but I've done this a few times just to get things working.
这篇关于在渲染与操作同名的视图时，Grails会重定向循环错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！