A DESCRIPTION OF THE REQUEST :
For years, XSLT 2.0 + XPath 2.0 are W3C recommendations now. Unfortunately, the JRE comes with a XSLT processor which is not implementing these new versions of XSLT and XPath. As there is a lot of features added in 2.0, it would be really cool to have an updated XSLT implementation shipping with the JRE.

JUSTIFICATION :
Using the 2.0 features, one can write much more complex algorithms with much less code. For example, there now are "real" loops instead of stack-limited recursion, and functions implemented in XSLT can be called from XPath instead of putting a xsl:call-template into a xsl:variable and using that variable in xsl:value-of. XSLT became a really useful programming language in 2.0, and now is the time to support this in Java.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
JAXP RI can execute 100% of XSLT 2.0 + XPath 2.0 mandatory features.
ACTUAL -
JAXP RI can not execute 100% of XSLT 2.0 + XPath 2.0 mandatory features.

CUSTOMER SUBMITTED WORKAROUND :
Configure JAXP to use a third party JAXP implementation like SAXON. This is not always an option due to three reasons:

(1) Costs. SAXON is only free when using a limited set of options.

(2) Complexity. SAXON must be installed manually ontop of the JRE.

(3) Overhead. SAXON is one more library that must get shipped with your application.