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java.lang.NullPointerException: 	at org.springframework.ide.eclipse.beans.core.internal.model.AbstractBeansConfig.resourceChanged(AbstractBeansConfig.java:570)	at org.springframework.ide.eclipse.beans.core.internal.model.validation.BeansConfigReloadingProjectContributionEventListener.checkResource(BeansConfigReloadingProjectContributionEventListener.java:175)	at org.springframework.ide.eclipse.beans.core.internal.model.validation.BeansConfigReloadingProjectContributionEventListener.access$0(BeansConfigReloadingProjectContributionEventListener.java:153)	at org.springframework.ide.eclipse.beans.core.internal.model.validation.BeansConfigReloadingProjectContributionEventListener$ResourceDeltaVisitor.visit(BeansConfigReloadingProjectContributionEventListener.java:270)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:69)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)	at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:49)	at org.springframework.ide.eclipse.beans.core.internal.model.validation.BeansConfigReloadingProjectContributionEventListener.start(BeansConfigReloadingProjectContributionEventListener.java:97)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager$1.execute(SpringProjectContributionManager.java:88)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager$9.run(SpringProjectContributionManager.java:269)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager.execute(SpringProjectContributionManager.java:272)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager.build(SpringProjectContributionManager.java:85)	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:726)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)