在Apache tomcat7中安装标记库时遇到麻烦 [英] Getting trouble in installing tag lib in Apache tomcat7

问题描述

我有应用程序，我想使用 jstl标签lib 。

I have application and I want to use jstl tag lib.

我有两个罐子 JSTL.jar 和 standard.jar 。我把它们放在我的 WEB-INF / lib 文件夹中。

I have two jars JSTL.jar and standard.jar. I put both in my WEB-INF/lib folder.

我在中配置它web.xml 喜欢

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">

    <taglib>
        <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>
        <taglib-location>/WEB-INF/fmt.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
        <taglib-location>/WEB-INF/c.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>http://java.sun.com/jstl/sql</taglib-uri>
        <taglib-location>/WEB-INF/sql.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>http://java.sun.com/jstl/x</taglib-uri>
        <taglib-location>/WEB-INF/x.tld</taglib-location>
    </taglib>

    <servlet>
        <servlet-name>loadingServlet</servlet-name>
        <servlet-class>loadingServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>loadingServlet</servlet-name>
        <url-pattern>/loadingServlet</url-pattern>
    </servlet-mapping>

     <welcome-file-list>
                <welcome-file>homepage.jsp</welcome-file>
    </welcome-file-list>

</web-app>

在页面上我使用以下代码

and on page i am using following code

<%@taglib prefix="k" uri="http://java.sun.com/jsp/jstl/core" %>

仍然是我收到错误。喜欢

and still i am getting error. like

    INFO: Deploying web application directory ServletExample
13 Apr, 2012 4:00:31 PM org.apache.tomcat.util.digester.Digester startElement
SEVERE: Begin event threw exception
java.lang.IllegalArgumentException: taglib definition not consistent with specification version
    at org.apache.catalina.startup.TaglibLocationRule.begin(WebRuleSet.java:1167)
    at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1282)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:501)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1359)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2747)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1543)
    at org.apache.catalina.startup.ContextConfig.parseWebXml(ContextConfig.java:1714)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1208)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:316)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5103)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:812)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:787)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:607)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1055)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:978)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1322)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
    at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:379)
    at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:324)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1041)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:774)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1033)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:291)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:727)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:620)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:303)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:431)
13 Apr, 2012 4:00:31 PM org.apache.catalina.startup.ContextConfig parseWebXml
SEVERE: Parse error in application web.xml file at jndi:/localhost/ServletExample/WEB-INF/web.xml
java.lang.IllegalArgumentException: taglib definition not consistent with specification version
    at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2687)
    at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2713)
    at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1285)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:501)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1359)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2747)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1543)
    at org.apache.catalina.startup.ContextConfig.parseWebXml(ContextConfig.java:1714)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1208)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:316)

推荐答案

你犯了几个错误：

• 你不应该在 web.xml 中手动重新定义JAR自己的taglib。这是一个神话。


• 您应该为Tomcat 7使用与Servlet 3.0兼容的 web.xml 。


• 您应该使用JSTL 1.2，而不是1.0。

• You should not manually redefine JAR's own taglibs in web.xml. This is a myth.
• You should be using a Servlet 3.0 compatible web.xml for Tomcat 7.
• You should be using JSTL 1.2, not 1.0.

全部删除它们。从 web.xml 中删除​​所有< taglib> 。从 / WEB-INF / lib 中删除​​这两个JAR。然后按照以下步骤操作：

Remove them all. Remove all <taglib> from web.xml. Remove the both JARs from /WEB-INF/lib. Then follow the following steps:

1. 下载 jstl-1.2.jar 并将其放入 / WEB-INF / lib 。



2. 修复 web.xml 以兼容Servlet 3.0。

1. Download jstl-1.2.jar and drop it in /WEB-INF/lib.

2. Fix your web.xml to be Servlet 3.0 compatible.

<?xml version="1.0" encoding="UTF-8"?>
<web-app 
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">

    <!-- Config here. No taglibs! -->

</web-app>

使用记录 taglib声明：

Use the documented taglib declaration:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

参见：

• 我们的JSTL维基页面



See also:

• Our JSTL wiki page

我怀疑你使用Roseindia.net作为Java EE资源。那里也提到了你的无效方法。你不应该这样做。您应该将该站点放在Internet黑名单中。这个网站充满了糟糕的答案和不良做法。当然，请使用Oracle的官方资源，或者使用Stackoverflow.com。

I have a vague suspicion that you're using Roseindia.net as a Java EE resource. Your invalid approach is also mentioned in there. You should not do that. You should put that site in your Internet blacklist. This site is so full of bad answers and bad practices. Use Oracle's official resources instead, or Stackoverflow.com of course.

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