I want to know why is this error coming. I first tried with minimal number of jars as specified in many tutorials but after that I downloaded and paste latest versio of jars in my lib folder.
Also please tell me what is the use of struts2-gxp-plugin-2.3.7.jar.
Google GXP is a replacement for JSP's that provides compile-time type safety.
Struts is attempting to load the plugin and apparently failing.
What is the contents of your WEB-INF/lib directory? When you updated the libraries, did you update Eclipse's build path configuration?
When you download Struts, you should get some sample applications in the apps directory. The struts2-blank application is a good starting place for creating a new app and it contains the following JAR files: