關鍵字：eclipse unbound "plug-in dependencies"
搜索引擎：google
This morning when I opened my Eclipse workspace, one of my RCP projects had ... that is normally called 'Plug-in Dependencies' was labelled 'org.eclipse.pde. core.requiredPlugins (unbound)' and the container was empty.
其實，這個workspace下存在sms[localhost]和sms_myself兩個project，實際呢，這兩個是同一個，只是project名字不同，其里面的包、類、應用庫都是相同的，只不過sms[localhost]是書本配套的源碼，而sms_myself是自己練習開發用的！
無意之中發現，當這兩個project中其一發生"unbound"的問題時，刪除其一，則"unbound"的問題就迎刃而解！所以后來我就把重新開一個eclipse來打開源碼sms[localhost]，此后兩個project相安無事，再也沒有"unbound"!
From: http://weaklyreachable.blogspot.com/2006/01/eclipse-plug-in-development_7029.html
