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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
linxue

nike kd 7 calm before the storm cr rates varied from 20 to 35 - 1 views

Nike kd 7 calm Nike KD 7 Calm Before the Storm before the storm cr rates varied from 20 to 35 but don't get down on yourself. High income locations would be more expensive than places of lesser int...

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started by linxue on 16 Jul 14 no follow-up yet
Benx Shen

JDBC Logger - - 0 views

jdbclogger.sourceforge.net/index.html

java jdbc log4j logger

shared by Benx Shen on 11 Sep 07 - Cached
  • What is JDBC Logger? JDBC Logger is an Open Source Java tool that intercepts and logs all database statements that use JDBC. It is intended for developers to monitor SQL statements generated by EJB, Hibernate or any other database access tool that doesn't display them in clear.
Benx Shen

分析java.lang.OutOfMemoryError: PermGen space - 0 views

www.javaeye.com/80620

jvm memory permgen_space

shared by Benx Shen on 22 May 07 - Cached
  • 發現很多人把問題歸因於： spring,hibernate,tomcat，因為他們動態產生類,導致JVM中的permanent heap溢出 。然後解決方法眾說紛紜，有人說升級 tomcat版本到最新甚至乾脆不用tomcat。還有人懷疑spring的問題，在spring論壇上討論很激烈，因為spring在AOP時使用CBLIB會動態產生很多類。
  • 於是有人對更基礎的JVM做了檢查，發現了問題的關鍵。原來SUN 的JVM把內存分了不同的區，其中一個就是permenter區用來存放用得非常多的類和類描述。
  • 對這個bug最徹底的解決辦法就是不要用SUN的JDK，而改用BEA的 JRokit.
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