Question

今天早些时候，我访问了一个我最近启动的网站，页面上充斥着一个丑陋的jasperexception: java.io.filenotfoundexception: /opt/tomcat/webapps/root/web-inf/lib/jstl-1.2.jar (too many open files)。我检查了我的服务器日志和tomcat日志，它们充满了相同的错误。我增加了tomcat的最大打开文件数限制，以作为一个临时解决方案来保持网站的正常运行，但是它很快又被填满。我已经使用与该网站相同的方法启动了其他网站，以前从未遇到过此问题。这次我唯一不同的是使用Mobirise来为前端制作基本布局，因此我不排除Mobirise使用的某些脚本可能是罪魁祸首。但是，当我获得tomcat已打开的文件列表时，我看到它已经打开了数百个tomcat-users.xml副本，而且它还在不断打开。

...
java    319 tomcat  935r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  936r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  937r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  938r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  939r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  940r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  941r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  942r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  943r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  944r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  945r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  946r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  947r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  948r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  949r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  950r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  951r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  952r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  953r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  954r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  955r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  956r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  957r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  958r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  959r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  960r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  961r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  962r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  963r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
java    319 tomcat  964r      REG              253,1     2164 263714 /opt/tomcat/conf/tomcat-users.xml
...

我不明白为什么要这么做。我一直在调试，扫描我的代码，并在Internet上搜索tomcat不断打开太多文件的问题，但是它们都只是说“增加最大文件数限制”。他们都没有解决问题的根源，也没有提及任何有关tomcat的事情，只是无限打开单个文件的副本。

[EDIT]：这是FileNotFoundException的完整堆栈跟踪：

28-Nov-2018 03:51:33.857 SEVERE [http-nio-8080-exec-5] org.apache.catalina.core.ApplicationDispatcher.invoke Servlet.service() for servlet [jsp] threw exception
 java.io.FileNotFoundException: /opt/tomcat/webapps/ROOT/WEB-INF/lib/jstl-1.2.jar (Too many open files)
        at java.util.zip.ZipFile.open(Native Method)
        at java.util.zip.ZipFile.<init>(ZipFile.java:225)
        at java.util.zip.ZipFile.<init>(ZipFile.java:155)
        at java.util.jar.JarFile.<init>(JarFile.java:166)
        at java.util.jar.JarFile.<init>(JarFile.java:130)
        at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:164)
        at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65)
        at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49)
        at org.apache.tomcat.util.descriptor.tld.TldResourcePath.openJar(TldResourcePath.java:134)
        at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:125)
        at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:431)
        at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:489)
        at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1445)
        at org.apache.jasper.compiler.Parser.parse(Parser.java:144)
        at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244)
        at org.apache.jasper.compiler.ParserController.parse(ParserController.java:105)
        at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:206)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:385)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:362)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:346)
        at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:603)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:400)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
        at kom.kitten.gingerpage.servlets.HomeServlet.doGet(HomeServlet.java:16)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:791)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)

28-Nov-2018 03:51:33.859 SEVERE [http-nio-8080-exec-5] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [kom.kitten.gingerpage.servlets.HomeServlet] in conte$
 java.io.FileNotFoundException: /opt/tomcat/webapps/ROOT/WEB-INF/lib/jstl-1.2.jar (Too many open files)
        at java.util.zip.ZipFile.open(Native Method)
        at java.util.zip.ZipFile.<init>(ZipFile.java:225)
        at java.util.zip.ZipFile.<init>(ZipFile.java:155)
        at java.util.jar.JarFile.<init>(JarFile.java:166)
        at java.util.jar.JarFile.<init>(JarFile.java:130)
        at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:164)
        at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65)
        at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49)
        at org.apache.tomcat.util.descriptor.tld.TldResourcePath.openJar(TldResourcePath.java:134)
        at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:125)
        at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:431)
        at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:489)
        at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1445)
        at org.apache.jasper.compiler.Parser.parse(Parser.java:144)
        at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244)
        at org.apache.jasper.compiler.ParserController.parse(ParserController.java:105)
        at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:206)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:385)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:362)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:346)
        at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:603)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:400)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
        at kom.kitten.gingerpage.servlets.HomeServlet.doGet(HomeServlet.java:16)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:791)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)

这是每次错误发生时（即每次有人尝试在网站上打开的页面，而tomcat中打开的文件太多时）记录的堆栈跟踪信息

Answer 1

这是由bug in Tomcat 9.0.13引起的，该问题已在Tomcat 9.0.14中修复。

Answer 2

将应用程序从tomcat7实例移动到tomcat 9实例后，我遇到了同样的问题。我觉得这可能是tomcat的错误。我删除了标签

<Resource pathname="conf/tomcat-users.xml" 
factory="org.apache.catalina.users.MemoryUserDatabaseFactory" 
type="org.apache.catalina.UserDatabase" 
auth="Container" name="UserDatabase"/>

在$ CATALINA_HOME / conf / server.xml中的GlobalNamingResources标记中

，重新启动后，问题自行解决。因此，我猜想问题出在Tomcat的管理应用程序上。

Answer 3

如果您在Tomcat上部署了应用程序。首先，必须确保在打开文件时将其明确关闭。您可以使用以下命令来查看linux中打开的文件：

lsof -p <process Id of Tomcat>

Tomcat打开了太多文件（tomcat-users.xml）

3 个答案: