Jasper reports JBoss 6/JasperReports类加载问题

我对JBoss6中的类加载有一个问题，Jasper报告。我们有一个多ear应用程序，其中两个ear都在ear根目录的lib文件夹中包含一个jasperreports-4.5.0.jar副本（jar版本相同，如md5校验和所示）

事情一直很顺利，直到大约3周前，团队中的某个人进行了大规模登记以更改某些日期/时间格式。从那时起，尝试从一个EAR运行Jasper报告总是失败，并出现相同的堆栈跟踪：

java.lang.ExceptionInInitializerError
at net.sf.jasperreports.engine.util.JRStyledTextParser.<clinit>(JRStyledTextParser.java:83) [:5.1.0]
at net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:121) [:5.1.0]
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:88) [:5.1.0]
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:103) [:5.1.0]
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:61) [:5.1.0]
at net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:153) [:5.1.0]
at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:82) [:5.1.0]
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:653) [:5.1.0]
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:969) [:5.1.0]
at com.landslide.reports.LandslideReport.printJasperReport(LandslideReport.java:411) [:]
at com.landslide.reports.LandslideReport.generateReport(LandslideReport.java:362) [:]
at com.landslide.reports.LandslideReport.exportToByteStream(LandslideReport.java:228) [:]
at com.landslide.reports.LandslideReport.exportToByteStream(LandslideReport.java:217) [:]
at com.landslide.common.delegate.MyListDelegate.createPDFDocumentForMyList(MyListDelegate.java:2491) [:]
at com.landslide.scheduledreport.ScheduledReportRun.getPdfFromMyList(ScheduledReportRun.java:367) [:]
at com.landslide.scheduledreport.ScheduledReportRun.run(ScheduledReportRun.java:197) [:]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [:1.6.0_39]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [:1.6.0_39]
at java.lang.Thread.run(Thread.java:662) [:1.6.0_39]
Caused by: net.sf.jasperreports.engine.JRRuntimeException: Class net.sf.jasperreports.extensions.DefaultExtensionsRegistry does not implement/extend net.sf.jasperreports.extensions.ExtensionsRegistry
at net.sf.jasperreports.engine.util.ClassUtils.instantiateClass(ClassUtils.java:56) [:5.1.0]
at net.sf.jasperreports.extensions.ExtensionsEnvironment.createDefaultRegistry(ExtensionsEnvironment.java:81) [:5.1.0]
at net.sf.jasperreports.extensions.ExtensionsEnvironment.<clinit>(ExtensionsEnvironment.java:69) [:5.1.0]
... 19 more

java.lang.ExceptionInInitializeError
net.sf.jasperreports.engine.util.JRStyledTextParser.（JRStyledTextParser.java:83）[:5.1.0]
net.sf.jasperreports.engine.fill.JRBaseFiller.（JRBaseFiller.java:121）[:5.1.0]
net.sf.jasperreports.engine.fill.JRVerticalFiller.（JRVerticalFiller.java:88）[:5.1.0]
net.sf.jasperreports.engine.fill.JRVerticalFiller.（JRVerticalFiller.java:103）[:5.1.0]
net.sf.jasperreports.engine.fill.JRVerticalFiller.（JRVerticalFiller.java:61）[:5.1.0]
net.sf.jasperreports.engine.fill.JRFiller.createFiller（JRFiller.java:153）[:5.1.0]
net.sf.jasperreports.engine.fill.JRFiller.fill（JRFiller.java:82）[:5.1.0]
net.sf.jasperreports.engine.JasperFillManager.fill（JasperFillManager.java:653）[:5.1.0]
net.sf.jasperreports.engine.JasperFillManager.fillReport（JasperFillManager.java:969）[:5.1.0]
在com.slademy.reports.LandslideReport.printJasperReport（LandslideReport.java:411）[：]
在com.slademy.reports.LandslideReport.generateReport（LandslideReport.java:362）[：]
在com.slademy.reports.LandslideReport.exportToByteStream（LandslideReport.java:228）[：]
在com.slademy.reports.LandslideReport.exportToByteStream（LandslideReport.java:217）[：]
在com.slademy.common.delegate.MyListDelegate.createPDFDocumentForMyList（MyListDelegate.java:2491）[：]
在com.slademport.scheduledreport.ScheduledReportRun.getPdfFromMyList（ScheduledReportRun.java:367）[：]
在com.slademy.scheduledreport.ScheduledReportRun.run（ScheduledReportRun.java:197）[：]
位于java.util.concurrent.ThreadPoolExecutor$Worker.runTask（ThreadPoolExecutor.java:895）[:1.6.039]
在java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:918）[:1.6.039]
在java.lang.Thread.run（Thread.java:662）[:1.6.039]
原因：net.sf.jasperreports.engine.JRRuntimeException:Class net.sf.jasperreports.extensions.defaultextensions注册表未实现/扩展net.sf.jasperreports.extensions.extensions注册表
在net.sf.jasperreports.engine.util.ClassUtils.instanceClass（ClassUtils.java:56）[:5.1.0]
在net.sf.jasperreports.extensions.ExtensionsEnvironment.createDefaultRegistry（ExtensionsEnvironment.java:81）[:5.1.0]
在net.sf.jasperreports.extensions.ExtensionsEnvironment.（ExtensionsEnvironment.java:69）[:5.1.0]
... 还有19个

尝试从另一个ear使用Jasper Reports功能可以很好地工作

当冒犯者的耳朵自行展开时，一切正常。我猜想，不知何故，类加载变得“混乱”，当尝试初始化Jasper Extensions注册表时，接口类要么找不到，要么来自另一个ear的Jasper库，并且Jasper InstanceClass调用失败

我尝试将Jasper库修改为最新版本（5.1.0），并尝试在war的included in the EAR中使用jboss.classsloading.xml文件，以及EAR本身，试图强制类装入器隔离，但没有成功

有什么建议吗

谢谢

---

--Dave Swindell

这可能是一些类路径问题，也许您部署了重复的“jasper”库？每个ear都有一个jasperreports库的副本，但我认为jboss应该在每个ear中提供类加载隔离？