定制 JSP 标记错误：找不到 的子转换器 "taglib"

Question

所以我试图在创建一个自定义标记显示的样本上工作当前日期。我做了示例中所述的所有操作，但在启动服务器时，它是抛出错误:没有找到"taglib"的子翻译器。这里需要修复什么?

Caused by: org.eclipse.jst.j2ee.commonarchivecore.internal.exception.ArchiveWrappedException
    at org.eclipse.jst.j2ee.commonarchivecore.internal.impl.ModuleRefImpl.getDeploymentDescriptor(ModuleRefImpl.java:167)
    at com.ibm.ws.runtime.component.DeployedModuleImpl.open(DeployedModuleImpl.java:237)
    at com.ibm.ws.runtime.component.DeployedModuleImpl.initialize(DeployedModuleImpl.java:436)
    ... 53 more
Caused by: org.eclipse.jst.j2ee.commonarchivecore.internal.exception.DeploymentDescriptorLoadException: WEB-INF/web.xml
    at org.eclipse.jst.j2ee.commonarchivecore.internal.impl.WARFileImpl.getDeploymentDescriptor(WARFileImpl.java:147)
    at org.eclipse.jst.j2ee.commonarchivecore.internal.impl.WARFileImpl.getStandardDeploymentDescriptor(WARFileImpl.java:301)
    at org.eclipse.jst.j2ee.commonarchivecore.internal.impl.EARFileImpl.getDeploymentDescriptor(EARFileImpl.java:401)
    at org.eclipse.jst.j2ee.commonarchivecore.internal.impl.ModuleRefImpl.getDeploymentDescriptor(ModuleRefImpl.java:165)
    ... 55 more
Caused by: java.lang.IllegalStateException: Parent Translator (WebAppTranslator(web-app,1971221886)) did not find a Child Translator for "taglib".

web.xml声明为:

<taglib>
 <taglib-uri>myTags</taglib-uri>
 <taglib-location>/WEB-INF/lib/DateTagLib.tld</taglib-location>
</taglib>

TLD file:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<taglib>
   <tlibversion>1.0</tlibversion>
   <info>Custom Date Tag</info>
  <tag>
    <name>displayDate</name>
    <tagclass>com.demo.DateTag</tagclass>
    <bodycontent>empty</bodycontent>
    <info>Display Date</info>
  </tag>    

标签类别:

package com.demo;
import javax.servlet.jsp.tagext.*;
import javax.servlet.jsp.*;
import javax.servlet.http.*;
import java.io.IOException;
import java.text.*;
import java.util.*;
public class DateTag extends TagSupport {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public int doStartTag() throws javax.servlet.jsp.JspException {
        HttpServletRequest req;
        Locale locale;
        HttpJspPage g;
        DateFormat df;
        String date;
        JspWriter out;
        req = (HttpServletRequest) pageContext.getRequest();
        locale = req.getLocale();
        df = SimpleDateFormat.getDateInstance(SimpleDateFormat.FULL, locale);
        date = df.format(new java.util.Date());  
        try {
            out = pageContext.getOut();
            out.print(date);
            } catch(IOException ioe){
                throw new JspException("IO Error: " + ioe.getMessage());
            } //end try/catch
            return Tag.SKIP_BODY;
    } //end doStarttag
} //end DateTag
</taglib>

Answer 1

我明白了。我没有在部署描述符中对自定义标记进行"静态引用"，而是尝试从JSP页面本身动态引用它，结果成功了。