解决Only a type can be imported. * resolves to a package

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.

<html><head><title>Apache Tomcat/7.0.75 - Error report</title><style></style> </head><body><h1>HTTP Status 500 - Unable to compile class for JSP: </h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u>Unable to compile class for JSP: </u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: [16] in the generated java file: [/usr/local/tomcat7/work/Catalina/localhost/dsideal_yy/org/apache/jsp/html/ypt/getLoginInfo_jsp.java]
Only a type can be imported. com.alibaba.fastjson.JSONObject resolves to a package

Stacktrace:
   org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:103)
   org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:366)
   org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:490)
   org.apache.jasper.compiler.Compiler.compile(Compiler.java:379)
   org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
   org.apache.jasper.compiler.Compiler.compile(Compiler.java:341)
   org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:662)
   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:364)
   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
   org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
   com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:82)
   dsidealsso.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:130)
   org.jasig.cas.client.util.AssertionThreadLocalFilter.doFilter(AssertionThreadLocalFilter.java:54)
   dsidealsso.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:133)
   org.jasig.cas.client.util.HttpServletRequestWrapperFilter.doFilter(HttpServletRequestWrapperFilter.java:75)
   dsidealsso.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:133)
   org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:199)
   dsidealsso.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:133)
   org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:124)
   dsidealsso.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:133)
   org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)
   dsidealsso.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:133)
   dsidealsso.FilterChainProxy.doFilter(FilterChainProxy.java:92)
</pre></p><p><b>note</b> <u>The full stack trace of the root cause is available in the Apache Tomcat/7.0.75 logs.</u></p><HR size="1" noshade="noshade"><h3>Apache Tomcat/7.0.75</h3></body></html>

网上有人说：

开发中国银行支付网关时碰到了这个问题。我想在index.jsp中导入PKCS7Tool，代码如下：

<%@ page import=”com.bocnet.common.security.PKCS7Tool” %>

运行时报错：
An error occurred at line: 9 in the generated java file
Only a type can be imported. com.bocnet.common.security.PKCS7Tool resolves to a package

意思是说只有一个类能被导入，com.bocnet.common.security.PKCS7Tool是一个包。

实际上是因为PKCS7Tool这个包没有导入java运行环境。于是我把pkcs7.jar、pkcs7-src.jar这两个包加到/usr/local/tomcat/lib/目录下，并重启tomcat，一定要确保tomcat已重启。再测试看看，程序正常运行了。

黄海的方式：fastjson-1.2.47.jar 拷贝到 /usr/local/tomcat7/lib下，然后 ./restart.sh tomcat！

<%@ page language="java" import="org.jasig.cas.client.authentication.AttributePrincipal" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%@ page language="java" import="java.util.*"%>

<%@ page language="java" import="com.alibaba.fastjson.JSONObject"%>

<%

        AttributePrincipal attributePrincipal = (AttributePrincipal)request.getUserPrincipal();

   Map <String,Object>map = attributePrincipal.getAttributes();

   String userId = String.valueOf(map.get("PERSONID"));

   String userName = String.valueOf(map.get("USER_NAME"));

    out.print(userName);

 %>

~

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