Eclipse Java項目無法運行並出現一些奇怪的錯誤

Question

大家好，當我嘗試運行一個開源項目時，遇到以下錯誤，請避免這些錯誤，

Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problems: 
    The import net cannot be resolved
    The import net cannot be resolved
    The import net cannot be resolved
    PacketSource cannot be resolved to a type
    PacketSource cannot be resolved to a type
    BuildSource cannot be resolved
    PacketSource cannot be resolved to a type
    PacketSource cannot be resolved to a type
    PrintStreamMessenger cannot be resolved to a variable
    PacketSource cannot be resolved to a type
    PacketSource cannot be resolved to a type
    PacketSource cannot be resolved to a type
    PrintStreamMessenger cannot be resolved to a variable
    PacketSource cannot be resolved to a type

    at Classes.snifferImpl.<init>(snifferImpl.java:32)
    at Classes.Zmonitor$1$1.run(Zmonitor.java:86)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

Answer 1

Unresolved compilation problems

意味着在Eclipse中有兩件事可能出錯：

1）您的src文件夾未標記為源文件夾

轉到“項目”>“屬性”>“ Java構建路徑”>“源”，然后添加源文件夾

2）您有一些從項目引用的jar文件，這些jar文件在項目中不存在或不在類路徑中。

轉到“項目”>“屬性”>“ Java構建路徑”>“庫”並添加jar文件（如果您有jar）