JAVA;有时：无法在用户映射部分打开的文件上执行请求的操作

分类：编程问答

如何解决JAVA;有时：无法在用户映射部分打开的文件上执行请求的操作

我们在Tomcat 8.5上运行Java应用程序，偶尔我们得到FileNotFoundException-下面的堆栈跟踪。

我们已将文件夹添加到Windows Defender的排除列表中，但没有结果。

这是我们从日志中获得的代码的一部分：

FileOutputStream fos = null;
                File tempDir = new File(System.getProperty("java.io.tmpdir"));
                final String attachmentFileName = attachmentScan.getFileName();
                File tempFile = new File(tempDir,attachmentFileName);
log show this line ->   **fos = new FileOutputStream(tempFile);**
                byte[] attBytes = attachmentScan.getContent();
                fos.write(attBytes);
                fos.flush();

异常堆栈跟踪：

12:12:11.378 [ajp-nio-8012-exec-17] ERROR org.apache.tapestry5.services.TapestryModule.RequestExceptionHandler - Processing of request failed with uncaught exception: D:\folder\Tomcat8\temp\document23234.pdf (The requested operation cannot be performed on a file with a user-mapped section open)
org.apache.tapestry5.runtime.ComponentEventException: D:\folder\Tomcat8\temp\document23234.pdf (The requested operation cannot be performed on a file with a user-mapped section open)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1141)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$3100(ComponentPageElementImpl.java:61)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1062)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1060)
    at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
    at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
    at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1124)
    at org.apache.tapestry5.internal.structure.ComponentPageElementResourcesImpl.invoke(ComponentPageElementResourcesImpl.java:146)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1058)
    at org.apache.tapestry5.internal.services.ComponentEventRequestHandlerImpl.handle(ComponentEventRequestHandlerImpl.java:81)
    at org.apache.tapestry5.internal.services.ImmediateActionRenderResponseFilter.handle(ImmediateActionRenderResponseFilter.java:42)
    at $ComponentEventRequestHandler_336059259ee733.handle(Unknown Source)
    at org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.java:42)
    at $ComponentEventRequestHandler_336059259ee733.handle(Unknown Source)
    at org.apache.tapestry5.upload.internal.services.UploadExceptionFilter.handle(UploadExceptionFilter.java:75)
    at $ComponentEventRequestHandler_336059259ee733.handle(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$41.handle(TapestryModule.java:2475)
    at $ComponentEventRequestHandler_336059259ee733.handle(Unknown Source)
    at $ComponentEventRequestHandler_336059259ee6a2.handle(Unknown Source)
    at org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handleComponentEvent(ComponentRequestHandlerTerminator.java:43)
    at org.apache.tapestry5.services.InitializeActivePageName.handleComponentEvent(InitializeActivePageName.java:39)
    at $ComponentRequestHandler_336059259ee6a4.handleComponentEvent(Unknown Source)
    at org.tynamo.security.SecurityComponentRequestFilter.handleComponentEvent(SecurityComponentRequestFilter.java:41)
    at $ComponentRequestFilter_336059259ee6a1.handleComponentEvent(Unknown Source)
    at $ComponentRequestHandler_336059259ee6a4.handleComponentEvent(Unknown Source)
    at $ComponentRequestHandler_336059259ee618.handleComponentEvent(Unknown Source)
    at org.apache.tapestry5.internal.services.ComponentEventDispatcher.dispatch(ComponentEventDispatcher.java:46)
    at $Dispatcher_336059259ee61b.dispatch(Unknown Source)
    at $Dispatcher_336059259ee615.dispatch(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:302)
    at org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
    at $RequestHandler_336059259ee616.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:902)
    at $RequestHandler_336059259ee616.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:892)
    at $RequestHandler_336059259ee616.service(Unknown Source)
    at org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:90)
    at $RequestHandler_336059259ee616.service(Unknown Source)
    at com.intek.archive.services.AppModule$3.service(AppModule.java:288)
    at $RequestFilter_336059259ee611.service(Unknown Source)
    at $RequestHandler_336059259ee616.service(Unknown Source)
    at $RequestHandler_336059259ee5fb.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:253)
    at org.tynamo.security.services.impl.SecurityConfiguration$1.call(SecurityConfiguration.java:56)
    at org.tynamo.security.services.impl.SecurityConfiguration$1.call(SecurityConfiguration.java:54)
    at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
    at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
    at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:380)
    at org.tynamo.security.services.impl.SecurityConfiguration.service(SecurityConfiguration.java:54)
    at $HttpServletRequestFilter_336059259ee5fa.service(Unknown Source)
    at $HttpServletRequestHandler_336059259ee5fd.service(Unknown Source)
    at org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:44)
    at $HttpServletRequestHandler_336059259ee5fd.service(Unknown Source)
    at org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
    at $HttpServletRequestHandler_336059259ee5fd.service(Unknown Source)
    at org.tynamo.resteasy.ResteasyRequestFilter.service(ResteasyRequestFilter.java:101)
    at $HttpServletRequestFilter_336059259ee5f9.service(Unknown Source)
    at $HttpServletRequestHandler_336059259ee5fd.service(Unknown Source)
    at com.intek.archive.ajax.AjaxUploadServletRequestFilter.service(AjaxUploadServletRequestFilter.java:31)
    at $HttpServletRequestHandler_336059259ee5fd.service(Unknown Source)
    at org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
    at $HttpServletRequestFilter_336059259ee5f6.service(Unknown Source)
    at $HttpServletRequestHandler_336059259ee5fd.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$1.service(TapestryModule.java:852)
    at $HttpServletRequestHandler_336059259ee5fd.service(Unknown Source)
    at $HttpServletRequestHandler_336059259ee5f4.service(Unknown Source)
    at org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:171)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:476)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.tapestry5.ioc.internal.OperationException: D:\folder\Tomcat8\temp\document23234.pdf (The requested operation cannot be performed on a file with a user-mapped section open)
    at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.logAndRethrow(OperationTrackerImpl.java:121)
    at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:88)
    at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
    at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1124)
    at org.apache.tapestry5.internal.structure.ComponentPageElementResourcesImpl.invoke(ComponentPageElementResourcesImpl.java:146)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1058)
    at org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl.triggerContextEvent(InternalComponentResourcesImpl.java:303)
    at org.apache.tapestry5.corelib.components.Form.advised$onAction_336059259ee6e5(Form.java:562)
    at org.apache.tapestry5.corelib.components.Form$Invocation_onAction_336059259ee6e4.proceedToAdvisedMethod(Unknown Source)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:84)
    at org.apache.tapestry5.ioc.internal.services.LoggingAdvice.advise(LoggingAdvice.java:45)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:86)
    at org.apache.tapestry5.corelib.components.Form.onAction(Form.java)
    at org.apache.tapestry5.corelib.components.Form.dispatchComponentEvent(Form.java)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:940)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1117)
    ... 85 common frames omitted
Caused by: org.apache.tapestry5.runtime.ComponentEventException: D:\folder\Tomcat8\temp\document23234.pdf (The requested operation cannot be performed on a file with a user-mapped section open)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1141)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$3100(ComponentPageElementImpl.java:61)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1062)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1060)
    at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
    ... 99 common frames omitted
Caused by: java.io.FileNotFoundException: D:\folder\Tomcat8\temp\document23234.pdf (The requested operation cannot be performed on a file with a user-mapped section open)
    at java.io.FileOutputStream.open0(Native Method)
    at java.io.FileOutputStream.open(Unknown Source)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at com.intek.archive.pages.input.ArchiveAnexPage.setAnexAttachment(ArchiveAnexPage.java:1003)
    at com.intek.archive.pages.input.ArchiveAnexPage.advised$onSuccess_336059259ee68b(ArchiveAnexPage.java:646)
    at com.intek.archive.pages.input.ArchiveAnexPage$Invocation_onSuccess_336059259ee68a.proceedToAdvisedMethod(Unknown Source)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:84)
    at org.apache.tapestry5.internal.hibernate.CommitAfterWorker$1.advise(CommitAfterWorker.java:53)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:86)
    at com.intek.archive.pages.input.ArchiveAnexPage.onSuccess(ArchiveAnexPage.java)
    at com.intek.archive.pages.input.ArchiveAnexPage.dispatchComponentEvent(ArchiveAnexPage.java)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:932)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1117)
    ... 103 common frames omitted

解决方法

您应该尝试为每个请求使用不同的输出文件名，并检查它们在写入后是否关闭，这样就可以确定这是错误的，这不是因为2个处理线程正在同时运行。像这样：

File tempFile = File.createTempFile("aaa","bbb");
byte[] attBytes = attachmentScan.getContent();
try(OutputStream fos = new FileOutputStream(tempFile)) {
    fos.write(attBytes);
}

您当然需要在应用程序中不需要的某个时候清理临时文件。

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