java.lang.NoSuchFieldError：completionKey

Question

当我尝试启动Derby Network Server时，我遇到了这个异常。这从来没有发生过，我现在不知道问题的原因是什么。有什么想法吗？

Exception in thread "main" java.lang.NoSuchFieldError: completionKey
at sun.nio.fs.WindowsNativeDispatcher.initIDs(Native Method)
at sun.nio.fs.WindowsNativeDispatcher.<clinit>(Unknown Source)
at sun.nio.fs.WindowsLinkSupport.getRealPath(Unknown Source)
at sun.nio.fs.WindowsPath.toRealPath(Unknown Source)
at sun.nio.fs.WindowsPath.toRealPath(Unknown Source)
at sun.util.calendar.ZoneInfoFile$1.run(Unknown Source)
at sun.util.calendar.ZoneInfoFile$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.util.calendar.ZoneInfoFile.<clinit>(Unknown Source)
at sun.util.calendar.ZoneInfo.getTimeZone(Unknown Source)
at java.util.TimeZone.getTimeZone(Unknown Source)
at java.util.TimeZone.setDefaultZone(Unknown Source)
at java.util.TimeZone.getDefaultRef(Unknown Source)
at java.util.TimeZone.getDefault(Unknown Source)
at java.text.SimpleDateFormat.initializeCalendar(Unknown Source)
at java.text.SimpleDateFormat.<init>(Unknown Source)
at java.text.DateFormat.get(Unknown Source)
at java.text.DateFormat.getDateInstance(Unknown Source)
at org.apache.derby.iapi.tools.i18n.LocalizedResource.init(Unknown Source)
at org.apache.derby.iapi.tools.i18n.LocalizedResource.<init>(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.init(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.<init>(Unknown Source)
at org.apache.derby.drda.NetworkServerControl.main(Unknown Source)

Answer 1

这是一个错误（！），这是因为运行的代码是针对带有字段的类编译的，并且在没有该字段的情况下使用另一个（已编译的）版本执行它。

返回并检查已安装的版本，重新编译所有内容等等 -