servlet中不能使用HttpClient吗？
在servlet中使用HttpClient，包已配置好，编译通过。
package use;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import bean.Stock;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
import java.util.TimerTask;
import java.util.HashMap;
import java.util.Timer;
public class UseServlet extends HttpServlet
{
private HashMap stocks;
[b] private HttpClient httpclient = new HttpClient(new MultiThreadedHttpConnectionManager());[/b]
public void init(ServletConfig config) throws ServletException
{
super.init(config);
}
............
.........
但在网页中调用时，出现错误：
[b]javax.servlet.ServletException: Error instantiating servlet class use.UseServlet[/b]
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Unknown Source)
问题在哪？请帮忙看一下！
我觉得不会是httpClient造成的吧
UseServlet 在你构造函数（init()）都调用完毕以后，变量都初始化完，都没有异常，肯定
[code="java"]private HttpClient httpclient = new HttpClient(new MultiThreadedHttpConnectionManager()); [/code]
这句话是没有错的。
你自己也说是网页调用的时候错误，你看看下面有没有cause by什么？
丢出异常还是要完整一点
把
[code="java"]private HttpClient httpclient = new HttpClient(new MultiThreadedHttpConnectionManager()); [/code]
换成
[code="java"]private HttpClient httpclient;
{
try {
httpclient = new HttpClient(new MultiThreadedHttpConnectionManager());
} catch (IOException e) {
e.printStackTrace();
}
}[/code]
然后把所有的异常贴出来看看。
[url]https://issues.apache.org/bugzilla/show_bug.cgi?id=36630[/url]
看看这个