jsp中 cannot be resolved to a type

引入java.util.ArrayList这个类的时候没有问题，但是引入自己写的类的时候不能通过编译，这是为什么呢？
jsp代码

<%@page import="Test.NewClass"%>

<%@page import="java.util.ArrayList"%>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

    pageEncoding="ISO-8859-1"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

<title>Insert title here</title>

</head>

<body>

<h2>java</h2>

<%

ArrayList<String> mylist=new ArrayList<String>();

NewClass n1=new NewClass();

n1.go();

%> 

</body>

</html>

自己写的类NewClass

package Test;



public class NewClass {

	public String go(){

		return "fanhui";

	}

}

错误信息
org.apache.jasper.JasperException: Unable to compile class for JSP:


An error occurred at line: 6 in the generated java file
Only a type can be imported. Test.NewClass resolves to a package

An error occurred at line: 15 in the jsp file: /index.jsp
NewClass cannot be resolved to a type
12: <h2>java</h2>
13: <%
14: ArrayList<String> mylist=new ArrayList<String>();
15: NewClass n1=new NewClass();
16: n1.go();
17: %>
18: </body>


An error occurred at line: 15 in the jsp file: /index.jsp
NewClass cannot be resolved to a type
12: <h2>java</h2>
13: <%
14: ArrayList<String> mylist=new ArrayList<String>();
15: NewClass n1=new NewClass();
16: n1.go();
17: %>
18: </body>


Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:93)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:435)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:298)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:302)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
另外Tomcat下webapps/HeadFirstHtml/WEB-INF/classes/Test文件夹中有已经编译过的NewClass.class文件，但是还是不能通过浏览器打开.jsp文件。
到底是哪里有问题了？