Table of Contents
As of OGNL 2.5.0 the OgnlContext
object can automatically tracks evaluations of expressions. This tracking is kept in the OgnlContext
as currentEvaluation during the
evaluation. After execution you can access the last evaluation through the lastEvaluation property of OgnlContext
.
![]() | Note |
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The tracing feature is turned off by default. If you wish to turn it on there is a |
Any method accessor, elements accessor, type converter, property accessor
or null handler may find this useful to give context to the operation being performed. The Evaluation
object is itself a tree and can be traversed up, down and left and right
through siblings to determine the exact circumstances of an evaluation. In addition the Evaluation
object tracks the node that was performing the operation, the source object on which that operation was being
performed and the result of the operation. If an exception is thrown during execution the user can get the last evaluation's last descendent to find out exactly which subexpression caused the error. The execption is also tracked in
the Evaluation
.