Hi Ales, I upgraded my spring from spring-1.2.7 to spring-2.0 and I am using the jboss spring deployer jboss-spring-version4, still I am getting the same error. I have my spring.jar in server/default/lib Besides my jboss-spring.deployer contains following items. spring-aop.jar spring-beans.jar spring-context.jar jboss-spring.jar spring-core.jar META-INF/jboss-service.xml. The error which I am getting is | ERROR [MainDeployer] Could not create deployment: file:/usr/local/jboss/server/default/deploy/jboss-spring.xml | INFO | jvm 1 | 2006/12/03 05:06:58 | org.jboss.deployment.DeploymentException: Unexpected exception parsing XML document from URL [file:/usr/local/jboss/server/ | fault/tmp/deploy/tmp31505jboss-spring.xml]; nested exception is java.lang.NoSuchMethodError: org.jboss.spring.factory.NamedXmlBeanDefinitionReader: method createRead | Context(Lorg/springframework/core/io/Resource;)Lorg/springframework/beans/factory/support/ReaderContext; not found; - nested throwable: (org.springframework.beans.fa | ory.BeanDefinitionStoreException: Unexpected exception parsing XML document from URL [file:/usr/local/jboss/server/default/tmp/deploy/tmp31505jboss-spring.xml]; nest | exception is java.lang.NoSuchMethodError: org.jboss.spring.factory.NamedXmlBeanDefinitionReader: method createReaderContext(Lorg/springframework/core/io/Resource;)L | g/springframework/beans/factory/support/ReaderContext; not found) | Please suggest.I have been struck at it from quite a long time. Is this some problem with the order of deployment? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3990933#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...