使用JetSpeed2进行二次开发时突然出现在保存Portlet配置信息时出现PSML页面文件数据丢失的情况，几经测试，最终发现是因为Portlet中的dom4j.jar与jetspeed应用中的dom4j包冲突导致的，删除Portlet应用中的dom4j.jar包后重启即可。

关键错误：

org.apache.jetspeed.page.PageNotFoundException: Could not unmarshal the file /home/deploy/zhbg/PortalServer/webapps/portal/../../pages/NPC/default-page.psml

Caused by: org.xml.sax.SAXParseException; Premature end of file.

详细错误：

[Fatal Error] :-1:-1: Premature end of file.

org.apache.jetspeed.page.PageNotFoundException: Could not unmarshal the file /home/deploy/zhbg/PortalServer/webapps/portal/../../pages/NPC/default-page.psml

    at org.apache.jetspeed.page.document.psml.CastorFileSystemDocumentHandler.unmarshallDocument(CastorFileSystemDocumentHandler.java:576)

    at org.apache.jetspeed.page.document.psml.CastorFileSystemDocumentHandler.getDocument(CastorFileSystemDocumentHandler.java:690)

    at org.apache.jetspeed.page.document.psml.CastorFileSystemDocumentHandler.refresh(CastorFileSystemDocumentHandler.java:744)

    at org.apache.jetspeed.cache.file.FileCache$1.notifyElementChanged(FileCache.java:209)

    at org.apache.jetspeed.cache.impl.EhCacheImpl$1.notifyElementUpdated(EhCacheImpl.java:146)

    at net.sf.ehcache.event.RegisteredEventListeners.notifyListener(RegisteredEventListeners.java:306)

    at net.sf.ehcache.event.RegisteredEventListeners.invokeListener(RegisteredEventListeners.java:284)

    at net.sf.ehcache.event.RegisteredEventListeners.internalNotifyElementUpdated(RegisteredEventListeners.java:180)

    at net.sf.ehcache.event.RegisteredEventListeners.notifyElementUpdated(RegisteredEventListeners.java:158)

    at net.sf.ehcache.Cache.notifyPutInternalListeners(Cache.java:1479)

    at net.sf.ehcache.Cache.putInternal(Cache.java:1456)

    at net.sf.ehcache.Cache.put(Cache.java:1383)

    at net.sf.ehcache.Cache.put(Cache.java:1348)

    at org.apache.jetspeed.cache.impl.EhCacheImpl.put(EhCacheImpl.java:74)

    at org.apache.jetspeed.cache.file.FileCache$FileCacheScanner.run(FileCache.java:348)

Caused by: Premature end of file.

    at org.exolab.castor.xml.Unmarshaller.convertSAXExceptionToMarshalException(Unmarshaller.java:775)

    at org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:672)

    at org.apache.jetspeed.page.document.psml.CastorFileSystemDocumentHandler.unmarshallDocument(CastorFileSystemDocumentHandler.java:429)

    ... 14 more

Caused by: org.xml.sax.SAXParseException; Premature end of file.

    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)

    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)

    at org.apache.jetspeed.page.document.psml.CastorFileSystemDocumentHandler$2.start(CastorFileSystemDocumentHandler.java:547)

    at org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:669)

    ... 15 more

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