Unable To Add Tag Library "xmlns:Fn" In Custom WebCenter Portal Framework Application (Doc ID 1918474.1)

Last updated on JANUARY 11, 2021

Applies to:

Symptoms

The requirement is to customize some WebCenter Portal task flows, specifically editing framework jsff files to add some code to do string manipulation.

The Java coding technique would be to include the 'xmlns:fn' tag library in the jsff/jspx file and use the tag for string comparison.

This is the Java Doc describing how to use the JSTL library and the 'fn' function to do string manipulation:
https://docs.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/fn/tld-summary.html
JavaServer Pages Standard Tag Library 1.1 Tag Reference
Also, an example here in a tutorial:
https://docs.oracle.com/javaee/1.4/tutorial/doc/JSTL3.html

However, this does not seem to be possible for WebCenter Portal applications.  Trying to use this library can result in errors or unexpected results in the task flow.

Cause

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