从Eclipse中的工作应用程序导出后，出现ClassNotFoundException [英] ClassNotFoundException after exporting from working application in Eclipse

问题描述

因此，在将项目导出到可运行的jar之后，我会收到此消息.对于这是为什么我一无所知，因为当我在Eclipse中选择运行"时，应用程序会完全运行 .我尝试过提取和打包依赖的库，但没有雪茄.

So I get this message after I have exported my project to a runnable jar. I'm pretty clueless as to why this is since the application runs perfectly when I select "Run" in Eclipse. I've tried both extract and package dependable libraries but no cigar.

有人知道该怎么办吗?

    Exception in thread "main" java.lang.NoClassDefFoundError: com/mysql/jdbc/jdbc2/optional/MysqlDataSource
    at jp.kddi.geonames.GeoNames.getConnectionWithDataSource(GeoNames.java:55)
    at jp.kddi.geonames.GeoNames.setFromGN(GeoNames.java:155)
    at jp.kddi.twittercrawler.Attributes.setCoordinatesGeonames(Attributes.java:297)
    at jp.kddi.twittercrawler.Attributes.setCoordinatesJSON(Attributes.java:280)
    at jp.kddi.twittercrawler.Attributes.SetAll(Attributes.java:42)
    at jp.kddi.twittercrawler.TweetList.makeList(TweetList.java:25)
    at jp.kddi.twittercrawler.TweetCloud.main(TweetCloud.java:45)
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.jdbc2.optional.MysqlDataSource
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
    ... 7 more

推荐答案

似乎您的MySql驱动程序尚未导出.要解决此问题，请转到Project Properties(右键单击Project)，然后选择Properties，然后依次选择Java Build Path和Order and Export.确保已导出MySql库.

It looks like your MySql drivers haven't been exported. To solve this go to Project Properties (right-click Project) and select Properties and then select Java Build Path and then Order and Export. Make sure the MySql library is exported.

这篇关于从Eclipse中的工作应用程序导出后，出现ClassNotFoundException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！