JBoss太多文件打开错误

Question

就在上周，我在访问 JBoss (v 4.2.2) Web 应用程序时遇到了问题。当我转到主页时，我得到一个 java.lang.NullPointerException 错误页面。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？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

Answer 1

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 的 PID

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

你可以的

ls -l /proc/jbosspid/fd

获取当时打开的文件的漂亮列表。

接下来您要做什么取决于您在此处看到的内容：

1. 您可能只需要使用 ulimit 稍微增加服务器可以打开的文件数量（同时查看服务器上的系统范围限制）
2. 也许您发现了一些您的应用程序忘记关闭的文件
3. ....

但是要关闭这些文件/摆脱打开的文件，您必须重新启动 JBoss 实例。

Answer 2

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。看看这个是运行 lsof 命令（仅作为 root） - 它会显示所有打开的文件描述符。

为了解决这个问题，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

（假设您的 jboss 由“jboss”用户运行）

Answer 3

我也有这个问题（在 linux 上）。 我做了什么：

1. 检查限制：ulimit -a
2. 检查输出中的 2 行：

打开文件 (-n) 1024 最大用户进程 (-u) 1024

1. 设置两个参数（例如在您的 .bash_profile 中）

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。