【发布时间】：2015-01-26 08:52:05
【问题描述】：
我正在使用 grails 2.4.4。我有三个 gsp 文件。 1._configureMessage(模板) 2._configureProjectId(模板) 3. 索引（视图）
我正在渲染索引中的两个模板。但我收到以下错误。
Line | Method
->> 1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
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| 615 | run in java.util.concurrent.ThreadPoolExecutor$Worker
^ 744 | run . . . in java.lang.Thread
Caused by GroovyPagesException: Error processing GroovyPageView: Error executing tag <g:render>: Error executing tag <g:form>: Error evaluating expression [gcmDeviceInstance.projectId] on line [8]: Cannot get property 'projectId' on null object
->> 527 | runWorker in G:\grails workspace\MDM_2.4.4\MDM\grails-app\views\androidGcmSender\gcmIndex.gsp
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Caused by GrailsTagException: Error executing tag <g:render>: Error executing tag <g:form>: Error evaluating expression [gcmDeviceInstance.projectId] on line [8]: Cannot get property 'projectId' on null object
->> 8 | doCall in G:/grails workspace/MDM_2.4.4/MDM/grails-app/views/androidGcmSender/gcmIndex.gsp
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Object gcmDeviceInstace 显示为空。我已将 gcmProjectInstance 返回到 index.gsp。我应该再次为模板做吗？ 我提供了下面的代码。这是我正在尝试使用的一个 android-gcm 插件，并且是 grails 的新手！ :)
AndroidGcmSenderController
package mdm
import java.util.List;
import java.util.Map;
class AndroidGcmSenderController {
def androidGcmService
def grailsApplication
def gcmIndex={
def gcmDeviceInstance= new GcmDevice()
gcmDeviceInstance.properties=params
return[gcmDeviceInstance: gcmDeviceInstance]
}
// def configureProjectId={
// def gcmDeviceInstance= new GcmDevice()
// gcmDeviceInstance.properties=params
// gcm
// return[gcmDeviceInstance: gcmDeviceInstance]
// }
def beforeInterceptor = {
if (params.projectId) {
params.tokens = (GcmDevice.findAllByProjectId(params.projectId) +
GcmDevice.findAllByProjectIdIsNull())*.token
}
}
def configureMessage = {
// def gcmDeviceInstance= new GcmDevice()
// gcmDeviceInstance.properties=params
// return[gcmDeviceInstance: gcmDeviceInstance]
params.apiKey = grailsApplication.config.android.gcm.api.key ?: ''
render view:'index', model: params
}
def Index = {
render view:'index', model:params
}
def sendMessage = {
['deviceToken', 'messageKey', 'messageValue'].each {
key -> params[key] = [params[key]].flatten().findAll { it }
}
def messages = params.messageKey.inject([:]) {
currentMessages, currentKey ->
currentMessages << [ (currentKey) : params.messageValue[currentMessages.size()]]
}
flash.message = 'received.message.response'
flash.args = [androidGcmService.sendMessage(messages, params.deviceToken,
params.collapseKey, params.apiKey).toString()]
redirect(action:'index', params: params)
}
}
GcmDevice 域
package mdm
class GcmDevice {
String token
String projectId
static constraints = {
token(nullable:false, blank:false, unique:true)
projectId(nullable:true)
}
}
gcmIndex.gsp
<html>
<head>
<meta name="layout" content="main" />
<title><g:message code="sender.title" /></title>
</head>
<body>
<div id="projectIdConfiguration">
<g:render template="androidGcmSender/configureProjectId" />
</div>
<div id="messageConfiguration">
<g:if test="${gcmDeviceInstance.projectId}">
<g:render template="androidGcmSender/configureMessage" />
</g:if>
</div>
<script type="text/javascript">
ajaxifyLink("form[name='projectId']", "#content", "action", "submit", "POST");
jQuery("input[name='projectId']").change(function(e) {
jQuery(form[name='projectId']).submit();
});
</script>
<g:if test="${request.xhr && gcmDeviceInstance.projectId && !flash.message}">
<script type="text/javascript">
jQuery("div#messageConfiguration").show("slide", { direction: "up" }, 300);
jQuery("div#messageConfiguration").effect("bounce", { times: 3, distance: 10 }, 200);
</script>
</g:if>
</body>
</html>
_configureMessage.gsp
<p class="usage"><g:message code="sender.usage.message" /></p>
<g:form name="message" action="sendMessage" controller="AndroidGcmSender">
<g:hiddenField name="projectId" value="${gcmDeviceInstance.projectId}" />
<div class="formEntryContainer">
<div class="labelContainer">
<label for="deviceToken"><g:message code="sender.form.deviceToken"/></label>
</div>
<div class="inputContainer">
<g:each var="token" in="${[deviceToken].flatten()}">
<div class="toDupe">
<g:select name="deviceToken" from="${tokens}" value="${token}" noSelection="['':'-']"/>
</div>
</g:each>
</div>
<div class="actionsContainer">
<button type="button" class="add dupeParam deviceToken">
<img src="${resource(dir: 'images/skin',file:'add.png')}" alt="${message(code:'add')}" border="0" />
</button>
</div>
</div>
<div class="formEntryContainer">
<div class="labelContainer">
<label for="apiKey"><g:message code="sender.form.apiKey"/></label>
</div>
<div class="inputContainer">
<g:textField name="apiKey" value="${apiKey}" />
</div>
<div class="actionsContainer">
</div>
</div>
<div class="formEntryContainer">
<div class="labelContainer">
<label for="collapseKey"><g:message code="sender.form.collapseKey"/></label>
</div>
<div class="inputContainer">
<g:textField name="collapseKey" value="${collapseKey}" />
</div>
<div class="actionsContainer">
</div>
</div>
<div class="formEntryContainer">
<div class="labelContainer">
<g:message code="sender.form.message"/>
</div>
<div class="inputContainer">
<g:each var="key" in="${[messageKey].flatten()}" status="index">
<div class="toDupe">
<div style="display:table"><div style="display:table-row">
<div style="display:table-cell">
<label for="messageKey"><g:message code="sender.form.messageKey" /></label>:
</div>
<div style="display:table-cell">
<g:textField name="messageKey" value="${key}" />
</div>
</div>
<div style="display:table-row">
<div style="display:table-cell">
<label for="messageKey"><g:message code="sender.form.messageValue" /></label>:
</div>
<div style="display:table-cell">
<g:textField name="messageValue" value="${[messageValue].flatten()[index]}" /><br/>
</div>
</div></div>
</div>
</g:each>
</div>
<div class="actionsContainer">
<button type="button" class="add dupeParam">
<img src="${resource(dir: 'images/skin',file:'add.png')}"
alt="${message(code:'add')}" border="0" />
</button>
</div>
</div>
<div class="formEntryContainer">
<div class="submitContainer">
<g:submitButton name="send" value="${message(code:'send')}" />
</div>
</div>
</g:form>
<script type="text/javascript">
jQuery("input[name='multicast']").attr("disabled", "disabled");
jQuery(".actionsContainer button.dupeParam").click(function(e) {
var prev = jQuery(this).parent().prev('.inputContainer');
var toClone = prev.children('.toDupe :first');
toClone.clone().appendTo(prev);
});
ajaxifyLink("form[name='message']", "#content", "action", "submit", "POST");
</script>
_configureProjectID.gsp
<p class="usage"><g:message code="sender.usage.projectId" /></p>
<g:form name="projectId" action="configureMessage" controller="AndroidGcmSender">
<div class="formEntryContainer">
<div class="labelContainer">
<label for="projectId"><g:message code="sender.form.projectId"/></label>
</div>
<div class="inputContainer">
<g:textField name="projectId" value="${gcmDeviceInstance.projectId}" />
</div>
<div class="actionsContainer">
<g:submitButton name="refresh" value="${message(code:'refresh')}" />
</div>
</div>
</g:form>
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标签： android grails groovy google-cloud-messaging