[EL-8] [el] Implementation of parseExpression does not implement spec

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0
• Fix Version/s: 1.1

Environment

Operating System: All
Platform: All

• Bugzilla Id: 30910
• Assignee: Henri Yandell
• Reporter: Jamie Taylor
• Created: 28/Aug/04 09:03
• Updated: 05/Sep/07 16:54
• Resolved: 05/Sep/07 14:35

Description

The implementation of parseExpression in the EL expression evaluator does not conform to the JSP 2.0 specification. The javadoc for the fMapper argument states that
"The ExpressionEvaluatormustnotholdontotheFunctionMapperreferenceafter returning fromparseExpression(). TheExpression object returned must invoke the same functions regardless of whether the mappings in the providedFunctionMapper instance change between calling ExpressionEvaluator.parseExpression() andExpression.evaluate()."

The test case which I will attach clearly shows that this is not the case.

Why hasn't anybody noticed this before, you may ask? I suspect that the current implementation of Tomcat never updates the bindings in its function mapper once one is constructed, since the functions are defined at web-app load time and can't be updated after that.