Hello,

I'm working on an upgrade from Magnolia 4.4.6 to 4.4.9-jr24 and after updating 
our Maven project's pom.xml I get the error below when trying to start up. Any 
idea what's wrong here? Did the format of the bootstrap data XML files change 
with the upgrade to Jackrabbit 2? If so, can we convert our old (sample) 
bootstrap data XML files somehow for use with Jackrabbit 2?

Nils.

----
2012-09-13 17:28:09,150 ERROR info.magnolia.module.InstallContextImpl           
: > Error while installing or updating site-tegenlicht module. Task 'Bootstrap 
samples' failed. (ValueFormatException: Single-valued property can not be set 
to an array of values:property 
/tegenlicht-sample/headers/tegenlicht-header-degroenetransitie1/resolutions/thumbnail/jcr:lastModified)
java.lang.RuntimeException: Error importing media.tegenlicht-sample: 
Single-valued property can not be set to an array of values:property 
/tegenlicht-sample/headers/tegenlicht-header-degroenetransitie1/resolutions/thumbnail/jcr:lastModified
        at 
info.magnolia.importexport.DataTransporter.importXmlStream(DataTransporter.java:345)
        at 
info.magnolia.importexport.BootstrapUtil.bootstrap(BootstrapUtil.java:125)
        at 
info.magnolia.module.delta.BootstrapResourcesTask.execute(BootstrapResourcesTask.java:66)
        at 
info.magnolia.module.delta.ConditionalDelegateTask.execute(ConditionalDelegateTask.java:63)
        at 
info.magnolia.module.ModuleManagerImpl.applyDeltas(ModuleManagerImpl.java:454)
        at 
info.magnolia.module.ModuleManagerImpl.installOrUpdateModule(ModuleManagerImpl.java:436)
        at 
info.magnolia.module.ModuleManagerImpl$1.doExec(ModuleManagerImpl.java:258)
        at info.magnolia.context.MgnlContext$VoidOp.exec(MgnlContext.java:434)
        at info.magnolia.context.MgnlContext$VoidOp.exec(MgnlContext.java:432)
        at 
info.magnolia.context.MgnlContext.doInSystemContext(MgnlContext.java:396)
        at 
info.magnolia.module.ModuleManagerImpl.performInstallOrUpdate(ModuleManagerImpl.java:252)
        at 
info.magnolia.module.ui.ModuleManagerNullUI.onStartup(ModuleManagerNullUI.java:68)
        at 
info.magnolia.cms.beans.config.ConfigLoader.load(ConfigLoader.java:107)
        at 
info.magnolia.cms.servlets.MgnlServletContextListener$2.doExec(MgnlServletContextListener.java:207)
        at info.magnolia.context.MgnlContext$VoidOp.exec(MgnlContext.java:434)
        at info.magnolia.context.MgnlContext$VoidOp.exec(MgnlContext.java:432)
        at 
info.magnolia.context.MgnlContext.doInSystemContext(MgnlContext.java:396)
        at 
info.magnolia.cms.servlets.MgnlServletContextListener.startServer(MgnlServletContextListener.java:205)
        at 
info.magnolia.cms.servlets.MgnlServletContextListener.contextInitialized(MgnlServletContextListener.java:201)
        at 
org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:634)
        at 
org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:228)
        at 
org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1132)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:577)
        at 
org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:491)
        at 
org.mortbay.jetty.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:160)
        at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
        at 
org.eclipse.jetty.server.handler.HandlerCollection$1.run(HandlerCollection.java:200)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:450)
        at java.lang.Thread.run(Thread.java:722)
Caused by: org.xml.sax.SAXException: Single-valued property can not be set to 
an array of values:property 
/tegenlicht-sample/headers/tegenlicht-header-degroenetransitie1/resolutions/thumbnail/jcr:lastModified
javax.jcr.ValueFormatException: Single-valued property can not be set to an 
array of values:property 
/tegenlicht-sample/headers/tegenlicht-header-degroenetransitie1/resolutions/thumbnail/jcr:lastModified
        at 
org.apache.jackrabbit.core.xml.SysViewImportHandler.processNode(SysViewImportHandler.java:104)
        at 
org.apache.jackrabbit.core.xml.SysViewImportHandler.endElement(SysViewImportHandler.java:248)
        at 
org.apache.jackrabbit.core.xml.ImportHandler.endElement(ImportHandler.java:195)
        at org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
        at 
info.magnolia.importexport.filters.ImportXmlRootFilter.endElement(ImportXmlRootFilter.java:77)
        at org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
        at 
info.magnolia.importexport.filters.RemoveMixversionableFilter.endElement(RemoveMixversionableFilter.java:127)
        at org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
        at 
info.magnolia.importexport.filters.VersionFilter.endElement(VersionFilter.java:84)
        at org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
        at 
info.magnolia.importexport.filters.MagnoliaV2Filter.endElement(MagnoliaV2Filter.java:88)
        at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown 
Source)
        at 
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
        at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
 Source)
        at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown 
Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
        at 
info.magnolia.importexport.DataTransporter.importXmlStream(DataTransporter.java:316)
        ... 28 more
Caused by: javax.jcr.ValueFormatException: Single-valued property can not be 
set to an array of values:property 
/tegenlicht-sample/headers/tegenlicht-header-degroenetransitie1/resolutions/thumbnail/jcr:lastModified
        at 
org.apache.jackrabbit.core.PropertyImpl.checkSetValue(PropertyImpl.java:274)
        at 
org.apache.jackrabbit.core.PropertyImpl.setValue(PropertyImpl.java:780)
        at org.apache.jackrabbit.core.NodeImpl$7.perform(NodeImpl.java:2086)
        at org.apache.jackrabbit.core.NodeImpl$7.perform(NodeImpl.java:2076)
        at 
org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:216)
        at org.apache.jackrabbit.core.ItemImpl.perform(ItemImpl.java:91)
        at org.apache.jackrabbit.core.NodeImpl.setProperty(NodeImpl.java:2076)
        at org.apache.jackrabbit.core.NodeImpl.setProperty(NodeImpl.java:1323)
        at 
org.apache.jackrabbit.core.xml.SessionImporter.createProperty(SessionImporter.java:185)
        at 
org.apache.jackrabbit.core.xml.SessionImporter.startNode(SessionImporter.java:443)
        at 
org.apache.jackrabbit.core.xml.SysViewImportHandler.processNode(SysViewImportHandler.java:93)
        ... 51 more
2012-09-13 17:28:09,155 ERROR info.magnolia.cms.beans.config.ConfigLoader       
: An unspecified error occurred during initialization: Error importing 
media.tegenlicht-sample: Single-valued property can not be set to an array of 
values:property 
/tegenlicht-sample/headers/tegenlicht-header-degroenetransitie1/resolutions/thumbnail/jcr:lastModified
----
------------------------------------------------------------------------
 VPRO   www.vpro.nl
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