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java.lang.IllegalArgumentException: Persist method required	at org.springframework.roo.support.util.Assert.notNull(Assert.java:112)	at org.springframework.roo.addon.dod.DataOnDemandMetadata.(DataOnDemandMetadata.java:83)	at org.springframework.roo.addon.dod.DataOnDemandMetadataProvider.getMetadata(DataOnDemandMetadataProvider.java:82)	at org.springframework.roo.classpath.itd.AbstractItdMetadataProvider.get(AbstractItdMetadataProvider.java:238)	at org.springframework.roo.classpath.itd.AbstractItdMetadataProvider.notify(AbstractItdMetadataProvider.java:103)	at org.springframework.roo.metadata.internal.DefaultMetadataService.notify(DefaultMetadataService.java:148)	at org.springframework.roo.metadata.internal.DefaultMetadataDependencyRegistry.notifyDownstream(DefaultMetadataDependencyRegistry.java:256)	at org.springframework.roo.classpath.javaparser.JavaParserMetadataProvider.onFileEvent(JavaParserMetadataProvider.java:131)	at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.publish(PollingFileMonitorService.java:333)	at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.scanNotified(PollingFileMonitorService.java:212)	at org.springframework.roo.process.manager.internal.DefaultProcessManager.doTransactionally(DefaultProcessManager.java:138)	at org.springframework.roo.process.manager.internal.DefaultProcessManager.execute(DefaultProcessManager.java:95)	at org.springframework.roo.bootstrap.ProcessManagerHostedExecutionStrategy.execute(ProcessManagerHostedExecutionStrategy.java:31)	at org.springframework.roo.shell.internal.AbstractShell.executeCommand(AbstractShell.java:132)	at org.springframework.roo.shell.jline.JLineShell.promptLoop(JLineShell.java:158)	at org.springframework.roo.bootstrap.Bootstrap.run(Bootstrap.java:114)	at org.springframework.roo.bootstrap.Bootstrap.main(Bootstrap.java:53)