Unable to locate Spring NamespaceHandler

원문: 감사합니다.
http://techieth8s.blogspot.com/2011/04/unable-to-locate-spring.html

오늘, 난 spring-security 관련 에러 때문에 고생하였습니다.
단지 WEB-INF/lib에 관련 library를 추가하고
http://www.springframework.org/schema/security/spring-security-3.1.xsd
를 사용하면 그만입니다.

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: class path resource [applicationContext.xml]
Solution: Add spring-tx.jar to WEB-INF/lib

Error:
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/security] Offending resource: class path resource [applicationContext.xml]
Solution: Add spring-core, spring-acl, spring-config, spring-web, spring-taglibs jars to WEB-INF/lib