下面是我自己写的代码：
java函数：
[code="java"]
package ELfunction;
public class Function
{
public static int rollDice()
{
return 1;
}
}
[/code]
tld标记库描述文件:
[code="java"]
<?xml version="1.0" encoding="UTF-8"?>
<taglib 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/j2ee/web-jsptaglibrary_2_1.xsd"
version="2.0"
1.2
functionTest
DiceFunction
rollIt
ELFunction.Function
int rollDice()
[/code]
JSP 文件：
[code="java"]
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="mine" uri="DiceFunction" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
${mine:rollIt()}
[/code]
怎么调试都会报下面的错误：
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:574)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
java.lang.NullPointerException
sun.jkernel.DownloadManager.getBootClassPathEntryForClass(Unknown Source)
sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
java.lang.ClassLoader.loadClass(Unknown Source)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1275)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)
org.apache.jasper.compiler.Validator$ValidateVisitor$1MapperELVisitor.visit(Validator.java:1613)
org.apache.jasper.compiler.ELNode$Function.accept(ELNode.java:129)
org.apache.jasper.compiler.ELNode$Nodes.visit(ELNode.java:200)
org.apache.jasper.compiler.ELNode$Visitor.visit(ELNode.java:242)
org.apache.jasper.compiler.ELNode$Root.accept(ELNode.java:56)
org.apache.jasper.compiler.ELNode$Nodes.visit(ELNode.java:200)
org.apache.jasper.compiler.Validator$ValidateVisitor.getFunctionMapper(Validator.java:1644)
org.apache.jasper.compiler.Validator$ValidateVisitor.prepareExpression(Validator.java:1512)
org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:724)
org.apache.jasper.compiler.Node$ELExpression.accept(Node.java:940)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2393)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2399)
org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)
org.apache.jasper.compiler.Validator.validate(Validator.java:1737)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:165)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:294)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:281)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
那位高手来解答下，谢谢了啊。 :cry:
悲剧啊。。刚刚去复制别人的代码，可以运行.我自己的怎么就是不行啊...
知道的人麻烦回答下啊
