出现这种错误怎么解决

Question

public class DashboardServlet extends HttpServlet {
    
    protected void processRequest(HttpServletRequest request
                                                , HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");        getWeatherForecast(request, response);
        
        getStockQuotes(request, response);
        
        getNewsItems(request, response);
        
        request.getRequestDispatcher("/jsp/ajaxDashboard.jsp")
                                                .forward(request, response);
    }
    
    private void getWeatherForecast(HttpServletRequest request
            , HttpServletResponse response) throws ServletException, IOException {
        
        WeatherForecastService forecastService = new WeatherForecastService();
        request.setAttribute("forecastData"
            , forecastService.getForecastFor(Constants.DEFAULT_WEATHER_ZIP_CODE));
        
    }
    
    private void getStockQuotes(HttpServletRequest request
            , HttpServletResponse response) throws ServletException, IOException {        GetQuotesResponse quotesResponse = 
                new StockQuoteService()
                    .getStockQuotesFor(Constants.DEFAULT_STOCK_TICKERS);
        
        Quote[] quotesArray = quotesResponse.getGetQuotesResult().getQuote();
        
        request.setAttribute("quotesArray", quotesArray);
    }
    
    private void getNewsItems(HttpServletRequest request
            , HttpServletResponse response) throws ServletException, IOException {
        
        Collection newsItems = new NewsService().getNewsItems();
        
        request.setAttribute("newsItems", newsItems);
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
}部分代码

Answer 1

stockquotoservice.java代码
package ajaxdashboard.service;import ajaxdashboard.ws.stockquote.GetQuotes;
import ajaxdashboard.ws.stockquote.GetQuotesResponse;
import ajaxdashboard.ws.stockquote.Quote;
import ajaxdashboard.ws.stockquote.StockQuotesLocator;
import ajaxdashboard.ws.stockquote.StockQuotesSoap;
import javax.xml.rpc.ServiceException;public class StockQuoteService {    public GetQuotesResponse getStockQuotesFor(String ticker) {
        GetQuotes quotes = new GetQuotes(ticker);
        GetQuotesResponse quotesResponse = null;
        try {
            quotesResponse = getStockQuotesSoap().getStockQuotes(quotes);
        } catch(java.rmi.RemoteException ex) {
            // TODO handle remote exception
        }
        
        Quote[] quotesArray = quotesResponse.getGetQuotesResult().getQuote();
        Quote quote = null;
        for(int i = 0; i < quotesArray.length; i++) {
            quote = quotesArray[i];
//            System.out.println("Quote for: " + quote.getCompanyName()
//                + " (" + quote.getStockTicker()+ ")"
//                + "\nQuote:" + quote.getStockQuote()
//                + "\nLastUpdate:" + quote.getLastUpdated()
//                + "\nChange:" + quote.getChange());
        }        return quotesResponse;
    }    private StockQuotesSoap getStockQuotesSoap() {
        StockQuotesSoap stockQuotesSoap = null;
        try {
            stockQuotesSoap = new StockQuotesLocator().getStockQuotesSoap();
        } catch (ServiceException ex) {
            ex.printStackTrace();
        }
        return stockQuotesSoap;
    }
}

Answer 2

下面这句有空指针：
quotesResponse.getGetQuotesResult().getQuote();请把 Tomcat/5.5.17 logs 下面的详细错误日志贴出来做进一步分析。

Answer 3

2006-5-9 9:23:49 org.apache.catalina.core.ApplicationContext log
信息: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
2006-5-9 9:23:59 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 9:23:59 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 9:24:03 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 9:24:03 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 10:25:43 org.apache.catalina.core.ApplicationContext log
信息: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
2006-5-9 10:25:45 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 10:25:45 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 10:25:47 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 10:25:47 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 13:32:42 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextDestroyed()
2006-5-9 13:32:42 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextDestroyed()
2006-5-9 13:32:50 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextDestroyed()
2006-5-9 13:32:50 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextDestroyed()
2006-5-9 13:45:04 org.apache.catalina.core.ApplicationContext log
信息: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
2006-5-9 13:45:09 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 13:45:09 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 13:45:10 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 13:45:10 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 14:30:57 org.apache.catalina.core.ApplicationContext log
信息: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
2006-5-9 14:30:58 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 14:30:58 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 14:30:59 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 14:30:59 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 15:27:16 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextDestroyed()
2006-5-9 15:27:16 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextDestroyed()
2006-5-9 15:27:24 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextDestroyed()
2006-5-9 15:27:24 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextDestroyed()
2006-5-9 21:41:38 org.apache.catalina.core.ApplicationContext log
信息: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
2006-5-9 21:41:39 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 21:41:39 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 21:41:40 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2006-5-9 21:41:40 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2006-5-9 22:58:42 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextDestroyed()
2006-5-9 22:58:42 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextDestroyed()
2006-5-9 22:58:50 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextDestroyed()
2006-5-9 22:58:50 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextDestroyed()日志