就在上周，我遇到了访问JBoss（v 4.2.2）Web应用程序的问题。当我转到主页时，我得到一个java.lang.NullPointerException错误页面。在查看JBoss日志输出后，似乎打开了太多文件，那么我将如何关闭这些文件呢？以下是JBoss日志的输出：
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)
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
答案 0 :(得分：12)
首先，您要确定哪些文件保持打开状态。我假设你的服务器运行linux，所以一旦你知道JBoss'es PID
ps ax | grep something-that-makes-your-jboss-process-unique
你可以做到
ls -l /proc/jbosspid/fd
获取一个在该时刻打开的文件列表。
接下来你要做什么取决于你在这里看到的内容：
但要关闭这些文件/摆脱打开的文件，你必须重新启动JBoss实例。
答案 1 :(得分：6)
假设您在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，一切都是文件 - 包括套接字，设备等。看看这个的wat是运行lsof命令（仅作为root） - 它将显示所有打开的文件描述符。
为了解决这个问题，请在/etc/security/limits.conf中编辑文件并添加以下行并重新启动jboss。
jboss soft nofile 16384
jboss hard nofile 16384
（假设您的jboss由“jboss”用户运行）
答案 2 :(得分：3)
我也有这个问题（在linux上）。 我做了什么：
open files (-n) 1024
max user processes (-u) 1024
ulimit -n 100000
ulimit -u 100000
在我的情况下，我必须更改两个参数才能解决问题。