tomcat - Icefaces 打开 jsf 和 icefaces jar 文件数百次

Question

我只是让我系统的所有用户同时尝试登录。我的服务器因这个错误而瘫痪:

SEVERE: Socket accept failed
Throwable occurred: java.net.SocketException: Too many open files
    at java.net.PlainSocketImpl.socketAccept(Native Method)
    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:449)
    at java.net.ServerSocket.implAccept(ServerSocket.java:473)
    at java.net.ServerSocket.accept(ServerSocket.java:441)
    at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:59)
    at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:212)
    at java.lang.Thread.run(Thread.java:736)
May 9, 2012 10:04:11 AM org.apache.tomcat.util.net.JIoEndpoint$Acceptor run

我运行了一个 lsof 命令来查看 tomcat 用户打开了哪些文件，并得到了一个巨大的文件列表。大多数看起来很正常，但后来我遇到了大约 700 个相同文件的条目，这是该输出的片段:

java    12285 tomcat  256r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  257r   REG                8,3  1955103    1040820 /usr/share/tomcat7/shared/nmsc/jsf-impl-2.1.4.jar
java    12285 tomcat  258r   REG                8,3  1955103    1040820 /usr/share/tomcat7/shared/nmsc/jsf-impl-2.1.4.jar
java    12285 tomcat  259r   REG                8,3   271669    1040879 /usr/share/tomcat7/shared/nmsc/icefaces-3.0.0.RC2.jar
java    12285 tomcat  260r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  261r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  262r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  263r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  264r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  265r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  266r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  267r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  268r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  269r   REG                8,3  1955103    1040820 /usr/share/tomcat7/shared/nmsc/jsf-impl-2.1.4.jar
java    12285 tomcat  270r   REG                8,3  1955103    1040820 /usr/share/tomcat7/shared/nmsc/jsf-impl-2.1.4.jar
java    12285 tomcat  271r   REG                8,3   271669    1040879 /usr/share/tomcat7/shared/nmsc/icefaces-3.0.0.RC2.jar
java    12285 tomcat  272r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  273r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  274r   REG                8,3   271669    1040879 /usr/share/tomcat7/shared/nmsc/icefaces-3.0.0.RC2.jar
java    12285 tomcat  275r   REG                8,3  1955103    1040820 /usr/share/tomcat7/shared/nmsc/jsf-impl-2.1.4.jar
java    12285 tomcat  276r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  277r   REG                8,3  1955103    1040820 /usr/share/tomcat7/shared/nmsc/jsf-impl-2.1.4.jar
java    12285 tomcat  278r   REG                8,3   271669    1040879 /usr/share/tomcat7/shared/nmsc/icefaces-3.0.0.RC2.jar
java    12285 tomcat  279r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  280r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  281r   REG                8,3  1955103    1040820 /usr/share/tomcat7/shared/nmsc/jsf-impl-2.1.4.jar
java    12285 tomcat  282r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  283r   REG                8,3   271669    1040879 /usr/share/tomcat7/shared/nmsc/icefaces-3.0.0.RC2.jar
java    12285 tomcat  284r   REG                8,3  1470076    1040880 /usr/share/tomcat7/shared/nmsc/icefaces-ace-3.0.0.RC2.jar
java    12285 tomcat  285r   REG                8,3  1955103    1040820 /usr/share/tomcat7/shared/nmsc/jsf-impl-2.1.4.jar

我为 tomcat 用户增加了允许的文件句柄数量，让我度过了一个上午，但为什么 tomcat 会为每个 HTTP 请求打开一个新的 icefaces 和 jsf 副本(这似乎是正在发生的事情)而不是使用类加载器在启动时加载的文件副本？我什至不知道从哪里开始解决这个问题。

Answer 1

就个人而言，我会从分析器开始(我使用 YourKit，因为他们为开源开发人员提供免费副本)，获取内存快照，然后搜索这些文件名。这应该会导致文件、URL 或类似的对象，它们有望提供一些关于问题所在的线索。如果没有，您将需要开始跟踪对象分配，这要昂贵得多但可行。其他分析器可用；)