java - 尝试将 JAR 文件添加到项目中，但出现 NoClassDefFoundError

Question

我从这个项目下载了 jar 文件 https://github.com/timmolter/XChange我现在正在尝试让示例程序在 Eclipse 中运行。

在运行前没有错误指示，但在尝试运行它时我收到以下错误消息。

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
    at com.xeiam.xchange.ExchangeFactory.<init>(ExchangeFactory.java:41)
    at com.xeiam.xchange.ExchangeFactory.<clinit>(ExchangeFactory.java:39)
    at com.xeiam.xchange.rhbotha.bot.Main.main(Main.java:18)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 3 more

这是我的代码。

package com.xeiam.xchange.rhbotha.bot;

import com.xeiam.xchange.Exchange;
import com.xeiam.xchange.ExchangeFactory;
import com.xeiam.xchange.currency.Currencies;
import com.xeiam.xchange.dto.marketdata.Ticker;
import com.xeiam.xchange.mtgox.v1.MtGoxExchange;
import com.xeiam.xchange.service.marketdata.polling.PollingMarketDataService;

public class Main {

    /**
     * @param args
     */
    public static void main(String[] args) {

        // Use the factory to get the version 1 MtGox exchange API using default settings
        Exchange mtGoxExchange = ExchangeFactory.INSTANCE.createExchange(MtGoxExchange.class.getName());

        // Interested in the public polling market data feed (no authentication)
        PollingMarketDataService marketDataService = mtGoxExchange.getPollingMarketDataService();

        // Get the latest ticker data showing BTC to USD
        Ticker ticker = marketDataService.getTicker(Currencies.BTC, Currencies.USD);
        System.out.println(ticker.toString());

        // Get the latest ticker data showing BTC to EUR
        ticker = marketDataService.getTicker(Currencies.BTC, Currencies.EUR);
        System.out.println(ticker.toString());

        // Get the latest ticker data showing BTC to GBP
        ticker = marketDataService.getTicker(Currencies.BTC, Currencies.GBP);
        System.out.println(ticker.toString());

    }

}

据我所知，这可能是类路径中的问题，但不确定该怎么做。任何帮助将不胜感激。

Answer 1

你缺少这个 jar(可能是其他的):org.slf4j.LoggerFactory

我的建议是使用 Maven 来管理您的依赖项(通过 pom)，但如果不下载这个 jar 并将其与其他 jar 包含在一起(即在类路径中)