roo fails at startup

[Jack Punt]

when I run roo on my existing project, it starts, manages a few things, then unmanages them, saying:

[FelixDispatchQueue] java.lang.NullPointerException 
    at org.springframework.roo.addon.web.mvc.jsp.JspViewManager.getFinderDocument(JspViewManager.java:331)
    at org.springframework.roo.addon.web.mvc.jsp.JspMetadataListener.get(JspMetadataListener.java:231)
    at org.springframework.roo.addon.web.mvc.jsp.JspMetadataListener.notify(JspMetadataListener.java:351)
    at org.springframework.roo.metadata.DefaultMetadataService.notify(DefaultMetadataService.java:179)
    at org.springframework.roo.metadata.internal.DefaultMetadataDependencyRegistry.notifyDownstream(DefaultMetadataDependencyRegistry.java:262)
    at org.springframework.roo.metadata.AbstractHashCodeTrackingMetadataNotifier.notifyIfRequired(AbstractHashCodeTrackingMetadataNotifier.java:47)
    at org.springframework.roo.classpath.itd.AbstractItdMetadataProvider.notify(AbstractItdMetadataProvider.java:127)
    at org.springframework.roo.metadata.DefaultMetadataService.notify(DefaultMetadataService.java:179)
    at org.springframework.roo.metadata.internal.DefaultMetadataDependencyRegistry.notifyDownstream(DefaultMetadataDependencyRegistry.java:262)
    at org.springframework.roo.metadata.DefaultMetadataService.notify(DefaultMetadataService.java:187)
    at org.springframework.roo.metadata.internal.DefaultMetadataDependencyRegistry.notifyDownstream(DefaultMetadataDependencyRegistry.java:244)
    at org.springframework.roo.classpath.javaparser.JavaParserMetadataProvider.onFileEvent(JavaParserMetadataProvider.java:138)
    at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.publish(PollingFileMonitorService.java:344)
    at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.scanAll(PollingFileMonitorService.java:318)
    at org.springframework.roo.process.manager.internal.DefaultFileManager.notify(DefaultFileManager.java:183)
    at org.springframework.roo.metadata.internal.DefaultMetadataDependencyRegistry.notifyDownstream(DefaultMetadataDependencyRegistry.java:276)
    at org.springframework.roo.addon.maven.MavenProjectMetadataProvider.onFileEvent(MavenProjectMetadataProvider.java:691)
    at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.publish(PollingFileMonitorService.java:344)
    at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.scanAll(PollingFileMonitorService.java:318)
    at org.springframework.roo.process.manager.internal.MonitoringRequestCommand.callback(MonitoringRequestCommand.java:36)
    at org.springframework.roo.process.manager.internal.MonitoringRequestCommand.callback(MonitoringRequestCommand.java:15)
    at org.springframework.roo.process.manager.internal.DefaultProcessManager.doTransactionally(DefaultProcessManager.java:177)
    at org.springframework.roo.process.manager.internal.DefaultProcessManager.completeStartup(DefaultProcessManager.java:99)
    at org.springframework.roo.process.manager.internal.DefaultProcessManager$1.frameworkEvent(DefaultProcessManager.java:62)
    at org.apache.felix.framework.util.EventDispatcher.invokeFrameworkListenerCallback(EventDispatcher.java:767)
    at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:724)
    at org.apache.felix.framework.util.EventDispatcher.run(EventDispatcher.java:942)
    at org.apache.felix.framework.util.EventDispatcher.access$000(EventDispatcher.java:54)
    at org.apache.felix.framework.util.EventDispatcher$1.run(EventDispatcher.java:106)
    at java.lang.Thread.run(Unknown Source)
[org.apache.felix.framework [0]] BundleEvent STOPPED

I have tried with Roo-1.1.0.RELEASE and several Roo-1.1.1 from git.
I expect it is something in my project (as roo works on other projects) but what could it be?
Any suggestions what I can do to get Roo working again? [I tried removing .roo-dbre]

[Jack Punt]

I'll mark this up to changes between 1.1.0 and 1.1.1;
Ignore the message, re-run DBRE two or three times,
when the dust settles, it is working again.