【发布时间】：2017-06-03 01:28:14
【问题描述】：
我的自定义 jsp 标记库抛出错误 HTTP 状态 500 - 无法为 JSP 编译类，如果我刷新同一页面，它将出现新的错误 HTTP 状态 500 - java.lang.ClassNotFoundException: org.apache .jsp.jspstn_jsp 。我已经厌倦了从 jsp 中删除我的自定义 tld 的 taglib 指令和标记，而不是正常工作。我不知道我的代码出了什么问题。
jsp文件：
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="/WEB-INF/tlds/ct.tld" prefix="cp" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World! jspstn</h1>
<cp:tp></cp:tp>
</body>
自定义 tld 文件：
<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.1" 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-jsptaglibrary_2_1.xsd">
<tlib-version>1.0</tlib-version>
<short-name>ct</short-name>
<uri>/WEB-INF/tlds/ct</uri>
<tag>
<name>tp</name>
<body-content>empty</body-content>
<tag-class>ctc</tag-class>
</tag>
</taglib>
自定义 tld 类（标签处理程序类）：
import java.io.IOException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
public class ctc extends SimpleTagSupport {
@Override
public void doTag() throws JspException, IOException {
JspWriter hp = getJspContext().getOut();
hp.print("works");
}
}
web.xml 文件：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<jsp-config>
<taglib>
<taglib-location>/WEB-INF/tlds/ct.tld</taglib-location>
<taglib-uri>/WEB-INF/tlds/ct.tld</taglib-uri>
</taglib>
</jsp-config>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
错误：
HTTP Status 500 - Unable to compile class for JSP:
type Exception report
message Unable to compile class for JSP:
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 17 in the jsp file: /jspstn.jsp
ctc cannot be resolved to a type
14: </head>
15: <body>
16: <h1>Hello World! jspstn</h1>
17: <cp:tp></cp:tp>
18: </body>
19: </html>
错误 2：
HTTP Status 500 - java.lang.ClassNotFoundException: org.apache.jsp.jspstn_jsp
type Exception report
message java.lang.ClassNotFoundException: org.apache.jsp.jspstn_jsp
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.ClassNotFoundException: org.apache.jsp.jspstn_jsp
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:176)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:380)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.ClassNotFoundException: org.apache.jsp.jspstn_jsp
java.net.URLClassLoader.findClass(URLClassLoader.java:381)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:129)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:60)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:171)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:380)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Netbeans 8.2，Tomcat 8.5.8。如果在回答我的问题时需要更多信息，请发表评论。如有错别字请见谅
【问题讨论】：
-
尝试在你的类中设置一个断点，你的标签类有一些编译问题。
-
检查 Tomcat 8.5.8 文档后。得出的结论是标签不应该放在默认包中
标签： java jsp tomcat servlets jsp-tags