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Preventing Java's java.lang.OutOfMemoryError: PermGen space failure | Eric's Agile Answers - 0 views
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The "OutOfMemoryError: PermGen space" message is normally encountered during development activites where a long-running JVM is asked to load/unload builds.
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The message is a symptom of an incomplete garbage collection sweep where resources are not properly released upon unload/restart. There is no shortage of debate (Hibernate forum, Sun forum, Spring Framework forum ) regarding which codebase is responsible for this symptom, but the finger of blame has been pointed at CGLIB, Hibernate, Tomcat, and even Sun's JVM.
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In my experience, the most pain-free method of resolving this issue is to switch from Sun's JDK implementation to BEA's freely available JRockit implementation.
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又是一位和我一樣都慘遭 "PermGen Space" 錯誤的開發者了!
很奇怪,為何會發生這樣的錯誤呢?
其中這篇文章所提到的技術,恰巧都是我現在所發生問題的架構,像是 Hibernate, Spring, Tomcat 等,還有 Sun JVM.... Orz
比較特別的是,多數提供的解決方式,都是去調整 JVM 的設定(-XX:MaxPermSize=256m)。這位老兄則是採用了 BEA JRockit 版本的 JVM 解決此問題,他表示至少這招對他是管用的!
不過,軟體開發很多時候都會發生這種「魔咒」,這種狀況底下,就好像一個並無可醫的人,只好嘗試各種偏方了! -
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mock框架搞什麼搞? - 0 views
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發文者 taowen 提出了一個對於 mock 框架(jMock, EasyMock)的使用經驗,認為這樣的框架並沒有帶給他測試上的方便性,反而似乎使得測試程式碼更多更亂,因此,他提出了對於 mock 框架技術的質疑。
不過,taowen 並不是單純地從情緒上發揮論述,而是舉出了一些簡單的程式馬來進行測試,試圖寫 mock 測試程式並非那麼簡易。另外,他自己另外展示了如何不用 mock 框架來進行單元測試。從這一點來看,taowen 很棒地說明了該如何進行單元測試,無論使用哪一種方法。
值得我學習的是,taowen 提出了自己對於 mock 框架的觀點,他的經驗告訴他:mock 到底在搞什麼東西!?於是勇敢地提出質疑。這樣的質疑,我認為比學習技術本身更有價值。從結果來看,這引發了相當多的迴響與討論,有人認為這樣,卻有人不以為然。(我相信 taowen 心臟必須要夠強,才能夠接受不同的意見而不感到生氣。我覺得我還需要學習這樣的質疑態度與接受批評的雅量。)總的來說,我發現我看到了更多元的資訊,作為一個學習者,比起單純地從一篇文章學習技術還要能夠學得更多。
雖然我使用 mock 技術有一小段時間,而我也懂得 mock 真正的意圖以及單元測試所帶來的價值,這並不會使得我一開始就認為 taowen 是錯誤的,即便看完他的發表之後,我仍然不認為他不應該提出這樣的質疑(我想我已經在上面一段表達我的「推崇」之意,以及我所認為背後的價值)。和一些參與討論的網友一樣,認為這不是一個完全適當的例子,但 taowen 也的確指出了 mock 技術會讓開發者詬病之處。然而,這並不足以說明 mock 真是非常難用,或造成了單元測試的困擾。實際的狀況是,我們得再從 mock 技術所帶來的好處出發,瞭解了之 -
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