I have used it for 3 hours today, I saw the official documentation finally realized. The process is not an error, and the struts package is not automatically included in accordance with the prompt error, and the struts package is not automatically included. The files have lib / down data-source> data-sources> ========= in the Execute method in the action, javax.sql.datasource ds = null; Java .sql.connection conn = null; Java.sql.Statement Stmt = NULL; DS = getDataSource (Request); conn = ds.getConnection (); web server Tomcat5.0