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星期一，我们每天早上都会生成一些报告。我们对他们中的大多数没有任何问题，但是有时候有2人失败（不规则）。JasperReports服务器 - 在调度程序生成报告时出错
这是我们与电子邮件得到异常的堆栈跟踪：
ExceptionConverter: java.io.IOException: No such file or directory
at java.io.UnixFileSystem.createFileExclusively(Native Method)
at java.io.File.checkAndCreate(File.java:1704)
at java.io.File.createTempFile(File.java:1792)
at java.io.File.createTempFile(File.java:1828)
at com.jaspersoft.jasperserver.api.metadata.common.domain.util.FileBufferedOutputStream.ensureFileOutput(FileBufferedOutputStream.java:144)
at com.jaspersoft.jasperserver.api.metadata.common.domain.util.FileBufferedOutputStream.write(FileBufferedOutputStream.java:164)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
at com.lowagie.text.pdf.OutputStreamCounter.write(Unknown Source)
at java.io.ByteArrayOutputStream.writeTo(ByteArrayOutputStream.java:109)
at com.lowagie.text.pdf.PdfStream.toPdf(Unknown Source)
at com.lowagie.text.pdf.PdfIndirectObject.writeTo(Unknown Source)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(Unknown Source)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(Unknown Source)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(Unknown Source)
at com.lowagie.text.pdf.PdfWriter.addToBody(Unknown Source)
at com.lowagie.text.pdf.PdfWriter.add(Unknown Source)
at com.lowagie.text.pdf.PdfDocument.newPage(Unknown Source)
at com.lowagie.text.Document.newPage(Unknown Source)
at net.sf.jasperreports.engine.export.JRPdfExporter.exportReportToStream(JRPdfExporter.java:686)
at net.sf.jasperreports.engine.export.JRPdfExporter.exportReport(JRPdfExporter.java:396)
at com.jaspersoft.jasperserver.api.engine.jasperreports.service.impl.EngineServiceImpl.exportToPdf(EngineServiceImpl.java:548)
at com.jaspersoft.jasperserver.api.engine.scheduling.quartz.PdfReportOutput.getOutput(PdfReportOutput.java:95)
at com.jaspersoft.jasperserver.api.engine.scheduling.quartz.ReportExecutionJob.executeAndSendReport(ReportExecutionJob.java:485)
at com.jaspersoft.jasperserver.api.engine.scheduling.quartz.ReportExecutionJob.execute(ReportExecutionJob.java:217)
at org.quartz.core.JobRunShell.run(JobRunShell.java:213)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:557)
让别人一个想法，为什么有些是失败的和大多数人不？ 我们使用JasperReports服务器4.7在Linux服务器上（Debian）与Tomcat。