我正在测试环境上运行一个进程，该进程需要 10 多个小时才能运行并使用 Jasper Reports v3.7.5 生成 PDF 文档。
进程经常成功完成，但在某些情况下进程失败并抛出此异常：
20/05/2017 02:45:23.503 ERROR [process-pool-2-thread-20] net.sf.jasperreports.extensions.DefaultExtensionsRegistry - Error instantiating extensions registry for simple.font.families
net.sf.jasperreports.engine.JRRuntimeException: java.io.IOException: Problem reading font data.
at net.sf.jasperreports.engine.fonts.SimpleFontFace.<init>(SimpleFontFace.java:77)
at net.sf.jasperreports.engine.fonts.SimpleFontFamily.createFontFace(SimpleFontFamily.java:316)
at net.sf.jasperreports.engine.fonts.SimpleFontFamily.setNormal(SimpleFontFamily.java:85)
at net.sf.jasperreports.engine.fonts.SimpleFontExtensionHelper.parseFontFamily(SimpleFontExtensionHelper.java:233)
at net.sf.jasperreports.engine.fonts.SimpleFontExtensionHelper.parseFontFamilies(SimpleFontExtensionHelper.java:204)
at net.sf.jasperreports.engine.fonts.SimpleFontExtensionHelper.loadFontFamilies(SimpleFontExtensionHelper.java:173)
at net.sf.jasperreports.engine.fonts.SimpleFontExtensionHelper.loadFontFamilies(SimpleFontExtensionHelper.java:142)
at net.sf.jasperreports.engine.fonts.SimpleFontExtensionsRegistryFactory.createRegistry(SimpleFontExtensionsRegistryFactory.java:63)
at net.sf.jasperreports.extensions.DefaultExtensionsRegistry.instantiateRegistry(DefaultExtensionsRegistry.java:238)
at net.sf.jasperreports.extensions.DefaultExtensionsRegistry.loadRegistries(DefaultExtensionsRegistry.java:213)
at net.sf.jasperreports.extensions.DefaultExtensionsRegistry.loadRegistries(DefaultExtensionsRegistry.java:162)
at net.sf.jasperreports.extensions.DefaultExtensionsRegistry.getRegistries(DefaultExtensionsRegistry.java:132)
at net.sf.jasperreports.extensions.DefaultExtensionsRegistry.getExtensions(DefaultExtensionsRegistry.java:104)
at net.sf.jasperreports.engine.util.JRStyledTextParser.<clinit>(JRStyledTextParser.java:76)
at net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:182)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:77)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:87)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:57)
at net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:142)
at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:78)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:624)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:605)
...
Caused by: java.io.IOException: Problem reading font data. …