JSP requirements
This custom tag library requires a servlet container that supports the JavaServer Pages Specification, version 1.2.
The tag library also works in some JSP version 1.1 servlet containers, such as Tomcat, but not in others, such as Weblogic. The tags in this tag library are designed according to the JSP 1.2 specification, which makes this requirement of the <jsp:getProperty ... /> tag:
The JSP 1.1 specification does not require this behaviour, and while Tomcat happens to support it, Weblogic does not. Note that it is fairly straightforward to write a custom tag that emulates this behaviour for Weblogic users. Sample source code for such a tag can be found here.
DBTags requirements
The DBTags tag library supports the use of DataSource objects, which are not part of the Java 2 Standard Edition. In order to use DataSources, either use Java 2 Enterprise Edition, or download the Optional API for JDBC 2.0.