JBoss太多文件打开错误

Question

就在上个星期，我一直在访问JBoss（v 4.2.2）Web应用程序的问题。当我进入主页时，我得到一个java.lang.NullPointerException错误页面。查看JBoss日志输出后，看起来有太多文件已打开，那么我将如何去关闭这些文件？下面是来自JBoss的日志输出：

ERROR [[jsp]] Servlet.service() for servlet jsp threw exception 
    java.io.FileNotFoundException: /usr/local/jboss-4.2.2.GA/server/default/work/jboss.web/localhost/catissuecore/org/apache/jsp/pages/content/home/Error_jsp.java (Too many open files) 
    at java.io.FileOutputStream.open(Native Method) 
    at java.io.FileOutputStream.<init>(FileOutputStream.java:179) 
    at java.io.FileOutputStream.<init>(FileOutputStream.java:70) 
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:152) 
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:306) 
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:286) 
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:273) 
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:316) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654) 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:447) 
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379) 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292) 
    at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:423) 
    at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:270) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446) 
    at java.lang.Thread.run(Thread.java:619) 

所有的

ERROR [[localhost]] Exception Processing ErrorPage[exceptionType=java.lang.Exception, location=/pages/content/home/Error.jsp] 
    org.apache.jasper.JasperException: Unable to compile class for JSP 
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:574) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:316) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654) 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:447) 
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379) 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292) 
    at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:423) 
    at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:270) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446) 
    at java.lang.Thread.run(Thread.java:619) 
    Caused by: java.io.FileNotFoundException: /usr/local/jboss-4.2.2.GA/server/default/work/jboss.web/localhost/catissuecore/org/apache/jsp/pages/content/home/Error_jsp.java (Too many open files) 
    at java.io.FileOutputStream.open(Native Method) 
    at java.io.FileOutputStream.<init>(FileOutputStream.java:179) 
    at java.io.FileOutputStream.<init>(FileOutputStream.java:70) 
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:152) 
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:306) 
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:286) 
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:273) 
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566) 
    ... 21 more 

Answer 1

首先要确定哪些文件（S）保持开放。我假设你的服务器运行Linux操作系统，所以一旦你知道JBoss'es PID

ps ax | grep something-that-makes-your-jboss-process-unique 

你可以做

ls -l /proc/jbosspid/fd 

让那些在那一时刻打开文件的一个很好的列表。

什么你下一步准备做取决于你在这里看到的一点：

1. 你可能只需要的文件数量的服务器可以打开有点用ulimit（也期待在全系统您的服务器上限值）
2. 也许你发现了一些文件的应用程序忘了关
3. ....

但要关闭这些文件/干掉你要打开的文件的重启JBos这个例子。

Answer 2

假设你在linux（或其他* NIX）上运行，那么每个进程的文件描述符限制为1024。在Unix中，一切都是一个文件 - 包括套接字，设备等等。有一个看看这个的wat是运行lsof命令（仅作为root用户） - 它会显示所有打开的文件描述符。

为了解决这个问题，请编辑/etc/security/limits.conf中的文件并添加以下行并重新启动您的jboss。

jboss   soft nofile   16384 
jboss   hard nofile   16384 

（假设你的JBoss是由 “JBoss的” 用户身份运行）

Answer 3

我有这个问题还（在Linux上）。 我所做的：

1. 检查范围：-a的ulimit
2. 检查2线输出：

 
    open files      (-n) 1024 
    max user processes    (-u) 1024 

1. （在你的.bash_profile为例）设置两个参数

 
    ulimit -n 100000 
    ulimit -u 100000 

在我的情况下，我不得不改变这两个参数来解决问题。