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java.lang.NullPointerException: 	at org.springframework.roo.shell.eclipse.Main.start(Main.java:187)	at org.springframework.roo.shell.eclipse.Bootstrap.start(Bootstrap.java:122)	at com.springsource.sts.roo.ui.internal.RooShellTab$7.run(RooShellTab.java:360)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)