jsp java。awt。颜色错误

Question

我有一个简单的Jsp页面：

<%@ page language="java" import="java.awt.Color"%> <%
Color background = Color.white;
%>

失败，错误如下：

java.lang.NoClassDefFoundError
    at _text__jsp._jspService(/text.jsp:3)
    at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
    at com.caucho.jsp.Page.subservice(Page.java:506)
    at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
    at com.caucho.server.http.Invocation.service(Invocation.java:315)
    at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
    at com.caucho.server.http.RunnerRequest.handleRequest(RunnerRequest.java:346)
    at com.caucho.server.http.RunnerRequest.handleConnection(RunnerRequest.java:274)
    at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
    at java.lang.Thread.run(Thread.java:534)

我在树脂2.1.13上运行它

知道是什么原因吗