Did your struct application work fine before using displaytag?
If it is working fine before using displaytag, you don't need to add strut blank.war. Just adding 5 jars I mentioned is enough for using display tag. But don't forget to add configure them in project build path too.
If you haven't checked that, please do the following to start a new project.
1. Create a new
tomcat project.
2. Extract struct struts-blank-1.3.10.war.
3. Add to the project and override existing files.
5. then add additional 5 jars to WEB-INF/lib and configure to project build path too.
4.Then restart your paging implementation.
Better you refer to the following link for step 4. All things can be done same. Except this sample creates Dynamic Web Project instead of Tomcat Project.
http://viralpatel.net/blogs/2009/06/struts-displaytag-tutorial-sort-pagination-data-displaytag-struts.html
Hope this help you...