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java.lang.NullPointerException: 	at org.springframework.ide.eclipse.data.internal.validation.InvalidParameterTypeRule.validate(InvalidParameterTypeRule.java:127)	at org.springframework.ide.eclipse.data.internal.validation.InvalidParameterTypeRule.validate(InvalidParameterTypeRule.java:1)	at org.springframework.ide.eclipse.core.model.validation.AbstractValidator$ValidationVisitor.visit(AbstractValidator.java:280)	at org.springframework.ide.eclipse.core.model.AbstractModelElement.accept(AbstractModelElement.java:131)	at org.springframework.ide.eclipse.core.model.validation.AbstractValidator.validate(AbstractValidator.java:142)	at org.springframework.ide.eclipse.core.model.validation.AbstractValidator.validate(AbstractValidator.java:104)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager$7.execute(SpringProjectContributionManager.java:260)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager$9.run(SpringProjectContributionManager.java:291)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager.execute(SpringProjectContributionManager.java:294)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager.runValidator(SpringProjectContributionManager.java:257)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager.build(SpringProjectContributionManager.java:131)	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:734)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:246)	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:299)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:302)	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:358)	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:381)	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)