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java.lang.NullPointerException: 	at org.springframework.roo.addon.web.mvc.controller.scaffold.WebScaffoldMetadata.(WebScaffoldMetadata.java:169)	at org.springframework.roo.addon.web.mvc.controller.scaffold.WebScaffoldMetadataProviderImpl.getMetadata(WebScaffoldMetadataProviderImpl.java:147)	at org.springframework.roo.classpath.itd.AbstractItdMetadataProvider.get(AbstractItdMetadataProvider.java:324)	at org.springframework.roo.metadata.DefaultMetadataService.getInternal(DefaultMetadataService.java:150)	at org.springframework.roo.metadata.DefaultMetadataService.evictAndGet(DefaultMetadataService.java:285)	at org.springframework.roo.classpath.itd.AbstractItdMetadataProvider.notify(AbstractItdMetadataProvider.java:158)	at org.springframework.roo.metadata.DefaultMetadataService.notify(DefaultMetadataService.java:240)	at org.springframework.roo.metadata.internal.DefaultMetadataDependencyRegistry.notifyDownstream(DefaultMetadataDependencyRegistry.java:214)	at org.springframework.roo.classpath.DefaultPhysicalTypeMetadataProvider.onFileEvent(DefaultPhysicalTypeMetadataProvider.java:97)	at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.publish(PollingFileMonitorService.java:350)	at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.scanAll(PollingFileMonitorService.java:323)	at org.springframework.roo.process.manager.internal.DefaultProcessManager.doTransactionally(DefaultProcessManager.java:181)	at org.springframework.roo.process.manager.internal.DefaultProcessManager.backgroundPoll(DefaultProcessManager.java:128)	at org.springframework.roo.process.manager.internal.DefaultProcessManager.timerBasedPoll(DefaultProcessManager.java:243)	at org.springframework.roo.process.manager.internal.DefaultProcessManager$2.run(DefaultProcessManager.java:71)