Struts 1 - 我的 Web 应用程序未找到 struts-taglib.jar

发布于 2024-08-24 21:14:56 字数 988 浏览 5 评论 0原文

我正在使用 Struts-1。我开发了一个基于struts 的Web 应用程序。我通过在 JSP 文件中插入以下行，在 struts-taglib.jar 中提供的 JSP 页面中使用 struts 标签：

<%@ taglib prefix="html" uri="http://struts.apache.org/tags-html" %>
<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic" %>
<%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean" %>

现在，当我在本地系统上运行应用程序时，但当我部署时，应用程序工作正常在服务器上，它显示以下异常：

org.apache.jasper.JasperException: The absolute uri: http://struts.apache.org/tags-html cannot be resolved in either web.xml or the jar files deployed with this application

从上面的异常来看，应用程序似乎没有找到 struts-taglib.jar 文件。

但我已将 struts-taglib.jar 放在 /WEB-INF/lib 目录中。那么问题出在哪里呢？

注意：您还可以查看 Java - 问题在部署 Web 应用程序中了解更多信息

原文

I am using Struts-1. I have developed a struts-based web application. I am using struts tags in my JSP pages supplied in struts-taglib.jar by inserting the following lines in the JSP file:

<%@ taglib prefix="html" uri="http://struts.apache.org/tags-html" %>
<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic" %>
<%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean" %>

Now the application is working fine when I run it on my localsystem but when I deploy it on a server, it shows the following exception:

org.apache.jasper.JasperException: The absolute uri: http://struts.apache.org/tags-html cannot be resolved in either web.xml or the jar files deployed with this application

From the above exception, it seems that the application hasn't found the struts-taglib.jar file.

But I have put the struts-taglib.jar in /WEB-INF/lib directory. Then where is the problem?

Note: You can also look at Java - Problem in deploying Web Application for more information

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合久必婚 2024-08-31 21:14:56

你说 JAR 确实出现在 Web 应用程序的 WEB-INF/lib 中；我会相信你的话并相信你。

我建议您打开 struts-taglib.jar，打开标签库的 .tld，并验证是否正确。您在下找到的值root 与 JSP 中给定前缀的 uri 匹配。我猜测 URI 不匹配，这意味着即使 JAR 位于 CLASSPATH 中，类加载器也无法找到标记库。

它还可能表明版本更改是否导致 JAR 和 JSP 中的 URI 不同步。

我刚刚下载了 struts-1.3.10-all.zip 并查看了其中包含的 struts-logic.tld 。标记的值是 http://struts.apache.org/tags-logic，所以看起来没问题。

.tld 文件看起来像是从 JAR 外部化的。在 .\src\el\src\main\resources\META-INF\tld 下查找它们，将它们放入 /WEB-INF 中，并在 web.xml 中显式引用它们。那应该可以解决你的问题。

我不相信 web.xml 中的 .tld 是必要的，但如果 URI 想法不成功，您可以尝试将“JSTL In Action”中类似的内容添加到您的 web.xml 中（进行相应修改）：

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

可能是因为 Struts 1.0 目前已经相当老了。 Struts 1.0 开发后，将 .tld 打包在 taglib 的 JAR 中成为一种常见的做法。

You say the JAR does appear in the WEB-INF/lib for the web app; I'll take your word for it and believe you.

I would suggest that you open up the struts-taglib.jar, open the .tld for the tag library, and verify that the <uri> value that you find under the <taglib> root matches the uri for the given prefix in your JSPs. I'm guessing that the URI doesn't match, which means the class loader won't be able to find the tag library even if the JAR is in the CLASSPATH.

It might also indicate whether or not a version change made the URI in your JAR and JSP out of synch.

I just downloaded struts-1.3.10-all.zip and looked at the struts-logic.tld contained within. The value of the <uri> tag is http://struts.apache.org/tags-logic, so it looks like you're okay there.

The .tld files look like they're externalized from the JAR. Look for them under .\src\el\src\main\resources\META-INF\tld, put them in your /WEB-INF, and refer to them explicitly in your web.xml. That should sort you out.

I don't believe .tld in web.xml is necessary anymore, but if the URI thought doesn't pan out you can try adding something similar to this example from "JSTL In Action" to your web.xml (modified accordingly):

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

It could be because Struts 1.0 is rather old at this point. Packaging the .tld in the JAR of the taglib became a common practice after Struts 1.0 was developed.

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