While building a skeleton web app, using Spring and Tiles, I encountered this strange error. I am trying to configure Spring 2.5.6 and Tiles 2.2.1 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tilesConfigurer' defined i n ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.UnsupportedOperationException: Class org.apache.tiles.web.util.ServletContextAdapter not recognized a TilesApplicationContext at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1338) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409) at java.security.AccessController....