为什么 Spring 在添加 tld 后才抱怨 WebApplicationContext
当我将此 tld 和自定义标记添加到我的 jsp 时，Spring 在启动时抛出错误。正在加载的页面“index.jsp”被配置为应用程序的默认首页。请解释为什么会发生这种情况？在将标签添加到页面之前，一切都按预期运行。
head.tag
<%@ attribute name="title" required="true" description="Page's title" %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<%@ taglib uri="../mytags.tld" prefix="pbl" %>
<head>
<title>
<spring:message code="${title}" text="${title}"></spring:message>
</title>
<script type="text/javascript" src="resources/scripts/global.js"></script>
<script type="text/javascript" src="resources/scripts/jquery-1.6.1.min.js"></script>
<script type="text/javascript" src="resources/scripts/jquery-ui-1.8.13.custom.min.js"></script>
<link rel="stylesheet" type="text/css" href="resources/styles/global.css" media="screen" />
<link rel="stylesheet" type="text/css" href="resources/styles/dark-hive/jquery-ui-1.8.13.custom.css" media="screen" />
<jsp:doBody />
</head>
index.jsp
<%@ taglib uri="/WEB-INF/mytags.tld" prefix="pbl" %>
<html>
<pbl:head title="hello">
<link rel="stylesheet" type="text/css" href="resources/styles/global.css" media="screen" />
</pbl:head>
<body>
<a href="home">Say Hello</a>
</body>
</html>
错误
org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 3
1: <%@ taglib uri="/WEB-INF/mytags.tld" prefix="pbl" %>
2: <html>
3: <pbl:head title="hello">
4: <link rel="stylesheet" type="text/css" href="resources/styles/global.css" media="screen" />
5: </pbl:head>
6: <body>
root cause
java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener registered?
org.springframework.web.context.support.WebApplicationContextUtils.getRequiredWebApplicationContext(WebApplicationContextUtils.java:84)
org.springframework.web.servlet.support.RequestContextUtils.getWebApplicationContext(RequestContextUtils.java:81)
org.springframework.web.servlet.support.RequestContext.initContext(RequestContext.java:219)
org.springframework.web.servlet.support.JspAwareRequestContext.initContext(JspAwareRequestContext.java:74)
org.springframework.web.servlet.support.JspAwareRequestContext.<init>(JspAwareRequestContext.java:48)
org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:76)
org.apache.jsp.tag.web.head_tag._jspx_meth_spring_005fmessage_005f0(head_tag.java:132)
org.apache.jsp.tag.web.head_tag.doTag(head_tag.java:85)
org.apache.jsp.index_jsp._jspx_meth_pbl_005fhead_005f0(index_jsp.java:93)
org.apache.jsp.index_jsp._jspService(index_jsp.java:63)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
When I add this tld and custom tag to my jsp Spring throws an error on startup. The page 'index.jsp' that is loading is configured as the default first page for the application. Please explain why this is happening? Everything works as expected before the tag is added to the page.
head.tag
<%@ attribute name="title" required="true" description="Page's title" %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<%@ taglib uri="../mytags.tld" prefix="pbl" %>
<head>
<title>
<spring:message code="${title}" text="${title}"></spring:message>
</title>
<script type="text/javascript" src="resources/scripts/global.js"></script>
<script type="text/javascript" src="resources/scripts/jquery-1.6.1.min.js"></script>
<script type="text/javascript" src="resources/scripts/jquery-ui-1.8.13.custom.min.js"></script>
<link rel="stylesheet" type="text/css" href="resources/styles/global.css" media="screen" />
<link rel="stylesheet" type="text/css" href="resources/styles/dark-hive/jquery-ui-1.8.13.custom.css" media="screen" />
<jsp:doBody />
</head>
index.jsp
<%@ taglib uri="/WEB-INF/mytags.tld" prefix="pbl" %>
<html>
<pbl:head title="hello">
<link rel="stylesheet" type="text/css" href="resources/styles/global.css" media="screen" />
</pbl:head>
<body>
<a href="home">Say Hello</a>
</body>
</html>
error
org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 3
1: <%@ taglib uri="/WEB-INF/mytags.tld" prefix="pbl" %>
2: <html>
3: <pbl:head title="hello">
4: <link rel="stylesheet" type="text/css" href="resources/styles/global.css" media="screen" />
5: </pbl:head>
6: <body>
root cause
java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener registered?
org.springframework.web.context.support.WebApplicationContextUtils.getRequiredWebApplicationContext(WebApplicationContextUtils.java:84)
org.springframework.web.servlet.support.RequestContextUtils.getWebApplicationContext(RequestContextUtils.java:81)
org.springframework.web.servlet.support.RequestContext.initContext(RequestContext.java:219)
org.springframework.web.servlet.support.JspAwareRequestContext.initContext(JspAwareRequestContext.java:74)
org.springframework.web.servlet.support.JspAwareRequestContext.<init>(JspAwareRequestContext.java:48)
org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:76)
org.apache.jsp.tag.web.head_tag._jspx_meth_spring_005fmessage_005f0(head_tag.java:132)
org.apache.jsp.tag.web.head_tag.doTag(head_tag.java:85)
org.apache.jsp.index_jsp._jspx_meth_pbl_005fhead_005f0(index_jsp.java:93)
org.apache.jsp.index_jsp._jspService(index_jsp.java:63)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
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评论（1）
因为 spring 标签需要 spring 应用程序。为此，您需要在 web.xml 中将
ContextLoaderListener定义为.. DispatcherServlet也应该没问题，尽管消息中没有指出）Because spring tags expect a spring application. To have such, you need to define a
ContextLoaderListeneras<listener>..</listener>in web.xml (I suspect thta mapping aDispatcherServletshould also be fine, although not indicated by the message)