代码在导出后不起作用，但在它之前答案

【问题标题】：Code not working after exporting, but befor it did代码在导出后不起作用，但在它之前
【发布时间】：2017-10-13 09:18:51
【问题描述】：

我需要你的帮助。

我目前正在开发一个使用 MySQL 的 java 应用程序（确切地说是 com.mysql.cj.jdbc.MysqlDataSource），如果我在 Intellij IDEA 中运行它，一切正常，但导出后，我收到一条错误消息：

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: com/mysql/cj/jdbc/MysqlDataSource
        at ger.mrSoUndso.Main$1.actionPerformed(Main.java:77)
        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
        at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
        at java.awt.Component.processMouseEvent(Unknown Source)
        at javax.swing.JComponent.processMouseEvent(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$500(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue$4.run(Unknown Source)
        at java.awt.EventQueue$4.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.mysql.cj.jdbc.MysqlDataSource
        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)
        ... 37 more

我该如何解决这个错误？

提前致谢。

Mr_SoUndso

PS：我知道之前有人问过类似的问题，但没有堆栈跟踪。也没有给出答案。

【问题讨论】：

你的代码请:)

标签： java mysql intellij-idea

【解决方案1】：

一位朋友向我展示了如何解决它：

您需要使您的库在您的 jar 中可用。然后一切正常

【讨论】：

【解决方案2】：

假设您将应用导出为jar 文件，您需要在运行应用时提供该驱动程序的路径jar，例如：

java -cp '<path_to_driver_jar>' yourApp.jar

这将确保您的应用可以使用该库并且它可以正常工作。

【讨论】：