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Benx Shen

Preventing Java's java.lang.OutOfMemoryError: PermGen space failure | Eric's Agile Answers - 0 views

jroller.com/...20060623

*i_comment* exception java memory permgen_space runtime

shared by Benx Shen on 22 May 07 - Cached
  • The "OutOfMemoryError: PermGen space" message is normally encountered during development activites where a long-running JVM is asked to load/unload builds.
  • 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.
  • 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.
  • ...1 more annotation...
  • On a recent project utilizing Tomcat 5.5.12 with Hibernate, I was plagued with this PermGen error, at times even experiencing it during web-based unit testing. Since making the switch to JRockit, I have not encountered this issue even once.
  • Benx Shen on 22 May 07
     
    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！

  • yahya_khk21121 on 12 Jul 17
Benx Shen

mock框架搞什麼搞？ - 0 views

www.javaeye.com/78824

*i_comment* *關注* java mock programming unit-test

shared by Benx Shen on 22 May 07 - Cached
  • Benx Shen on 22 May 07
     
    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
  • yahya_khk21121 on 12 Jul 17
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