Exception in thread "main" java.lang.NoSuchMethodError ？

2009-04-07 11:46:06 339 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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不是没有main函数的问题。环境变量也设置成功。
代码如下

import com.sun.syndication.feed.synd.SyndFeed;



import com.sun.syndication.io.SyndFeedInput;



import com.sun.syndication.io.XmlReader;

import java.net.*;

public class Writer {

	public Writer(){

        System.out.println("Start...");

        String str ="http://wyzwz527.blogbus.com/index.rdf";

        boolean ok = false;

        try {         

            URL feedUrl = new URL(str);

            SyndFeedInput input = new SyndFeedInput();

            SyndFeed feed = input.build(new XmlReader(feedUrl));

            System.out.println(feed);

          ok = true;

        }

        catch (Exception ex) {

            ex.printStackTrace();

            System.out.println("ERROR: "+ex.getMessage());

        }

        if (!ok) {

            System.out.println();

            System.out.println("FeedReader reads and prints any RSS/Atom feed type.");

            System.out.println("The first parameter must be the URL of the feed to read.");

            System.out.println();

        }

		

	}

    public static void main(String[] args){

    	new Writer();



    }



}

没任何语法错误，就是编译之后报错
Start...
Exception in thread "main" java.lang.NoSuchMethodError: com.sun.syndication.io.impl.BaseWireFeedParser.<init>(Ljava/lang/String;)V
at com.sun.syndication.io.impl.OPML10Parser.<init>(OPML10Parser.java:46)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at com.sun.syndication.io.impl.PluginManager.loadPlugins(PluginManager.java:90)
at com.sun.syndication.io.impl.PluginManager.<init>(PluginManager.java:55)
at com.sun.syndication.io.impl.PluginManager.<init>(PluginManager.java:46)
at com.sun.syndication.io.impl.FeedParsers.<init>(FeedParsers.java:53)
at com.sun.syndication.io.WireFeedInput.getFeedParsers(WireFeedInput.java:64)
at com.sun.syndication.io.WireFeedInput.build(WireFeedInput.java:273)
at com.sun.syndication.io.WireFeedInput.build(WireFeedInput.java:195)
at com.sun.syndication.io.SyndFeedInput.build(SyndFeedInput.java:123)
at Writer.<init>(Writer.java:15)
at Writer.main(Writer.java:32)

打印那行语句还是能执行的。。。。

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