Development Mode not working : BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/tx]

I have an application gwt(2.6.0), spring(3.2.5.RELEASE), hibernate(4.2.1.Final), maven(2.2). 

When I run as web Application, I got this error :

org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/tx]

Offending resource: ServletContext resource [/WEB-INF/applicationContext.xml]

Thanks for Help ...

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