|Oracle JavaServer Pages Developer's Guide and Reference
Part Number A83726-01
This section discusses two aspects of compile-time tag libraries compared to runtime tag libraries:
taglibdirective required for the compile-time JML implementation in particular
The Sun Microsystems JavaServer Pages Specification, Version 1.1, describes a runtime support mechanism for custom tag libraries. This mechanism, using an XML-style tag library description file to specify the tags, is covered in "Standard Tag Library Framework".
Creating and using a tag library that adheres to this model assures that the library will be portable to any standard JSP environment.
There are, however, reasons to consider compile-time implementations:
In the future, Oracle may offer a general framework for creating custom tag libraries with compile-time tag implementations. Such implementations would depend on the OracleJSP translator, so would not be portable to other JSP environments.
The general advantages and disadvantages of compile-time implementations apply to the Oracle JML tag library as well. There may be situations where it is advantageous to use the compile-time JML implementation as first introduced in older versions of OracleJSP. There are also a few additional tags in that implementation, and some additional expression syntax that is supported. (See "JML Compile-Time/220.127.116.11.x Syntax Support" and "JML Compile-Time/18.104.22.168.x Tag Support".)
It is generally advisable, however, to use the JML runtime implementation that adheres to the JSP 1.1 specification.
The OracleJSP 22.214.171.124.x/compile-time JML support implementation uses a custom class supplied by Oracle,
OpenJspRegisterLib, to implement JML tag support.
In a JSP page using JML tags with the compile-time implementation, the
taglib directive must specify the fully qualified name of this class (as opposed to specifying a TLD file as in standard JSP 1.1 tag library usage).
Following is an example:
For information about usage of the taglib directive for the JML runtime implementation, see "The taglib Directive".