[TAPESTRY-142] NPE as follow-up to a ClassNotFoundException caused by a wrongly stuffed OGNL context

• Type: Bug
• Status: Resolved
• Resolution: Fixed
• Affects Version/s: 3.0
• Component/s: Framework
• Environment: Operating System: Windows XP; Platform: PC
• Bugzilla Id: 27954
• Assignee: Howard Lewis Ship
• Reporter: Michael Frericks
• Created: 26/Mar/04 02:46
• Updated: 22/Jul/05 21:09
• Resolved: 22/Jul/05 21:09

Description

Description

NPE as follow-up to a ClassNotFoundException caused by a wrongly stuffed OGNL
context

Reason:

org.apache.tapestry.pageload.PropertyInitializer#prepareInvariant

contains the line

else if (Ognl.isConstant(_expression))

OGNL then uses the ognl.DefaultClassResolver which
loads classes by "Class.forName()".
In webapp with jars spread all over the ear this can
cause ClassNotFoundExceptions.

Solution:

Change in

org.apache.tapestry.pageload.PropertyInitializer#prepareInvariant

the line

else if (Ognl.isConstant(_expression))

to

else if (Ognl.isConstant(_expression, Ognl.createDefaultContext(null,
_resolver)))

and the tapestry classloading mechanism is used. This works even well in jar
spreading webapps.

Issue Links

• is related to: TAPESTRY-408 OGNL can't access a static field in a class in the webapp context