jees2 Going deeper into Jakarta Enterprise Edition Used technologies Apache Tomcat 11 Maven 3 See pom.xml for details Eclipse 2024-06 with disabled warning for other problems with TagExtraInfo class Window - Preferences - Web - JSP files - Validation -> Custom actions Eclipse integration by Project Facets Set Tomcat 11 as the required runtime with highest Dynamic Web Module and Java dependencies supported Check for the RDBMS actually used Almost any other RDBMS supported by JDBC should do For setup see hron Let Tomcat know how to connect to it The JDBC jar should be placed in Tomcat lib folder Add a resource element in context.xml with name jdbc/hron See META-INF/context.xml for details