The following comment has been added to this issue:
Author: Stan Zapryanov
Created: Wed, 27 Aug 2003 1:15 PM
Body:
After a little more research, I was able to correct the problem by setting a system
property:
//System.setProperty("ognl.keepLastEvaluation","true");
System.setProperty("ognl.traceEvaluations","true");
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View the issue:
http://jira.opensymphony.com/secure/ViewIssue.jspa?key=XW-82
Here is an overview of the issue:
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Key: XW-82
Summary: Integration with newer OGNL releases
Type: Bug
Status: Assigned
Priority: Minor
Project: XWork
Versions:
1.0-beta1
Assignee: Patrick Lightbody
Reporter: Stan Zapryanov
Created: Wed, 27 Aug 2003 11:45 AM
Updated: Wed, 27 Aug 2003 11:45 AM
Environment: NT, JDK 1.4_3, and OGNL 2.6.x
Description:
It seems that some changes made to ONGL in its newer versions are causing a
NullPointerException for ognlContext.getCurrentEvaluation().get..
Example in CompoundRootAccessor:
ognlContext.pushEvaluation(new
Evaluation(ognlContext.getCurrentEvaluation().getNode(), o));
What I believe are the related changes made in OGNL 2.6.0:
(Full info under http://www.ognl.org/2.6.0/ReleaseNotes.html)
Ability to turn off evaluation tracing for speed reasons. This is an effect of
reimplementing the way indexed access is done. Evaluation tracing overhead is about 2x
slower than without so this can be very significant.
Keep track of whether to store the last evaluation or release it (if tracing is on).
The default is true (keep last evaluation) for compatibility but having your code that
creates contexts default this to false is recommended if you want to keep memory usage
down. These get created a lot and if you don't have a good reason to remember the last
Evaluation after an expression is run then you should be letting them get recycled. An
alternative (I know M?ns Klercker needs this) is to use the last Evaluation and then
call OgnlContext.recycleLastEvaluation() to let it get back into the pool.
OgnlException now stores the root evaluation that caused an exception. This is
regardless of the setting of keepLastEvalution in the context (if tracing is on), but
this will not occur unless the evaluation tracing is enabled.
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