Hi,
[Tiles 2.0.4, Tomcat 5.5.25, Struts 2.0.11, struts2-tiles-plugin]
I'm trying to track down the source of the following intermittent
exception. It occurs immediately after a deployment of the webapp and
doesn't affect the subsequent operation of Tiles. It's definitely
only a temporary issue during initialization.
2008-12-17 10:28:09,503 ERROR [http-8080-Processor24]
[RoleSecurityTagSupport] Error executing tag: XML error reading
definitions.
org.apache.tiles.definition.DefinitionsFactoryException: XML error
reading definitions.
at
org
.apache
.tiles
.definition
.digester
.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:251)
With a breakpoint inside the DigesterDefinitionsReader I found the
true cause is a SAX exception that's wrapped by the
DefinitionsFactoryException (it's not logged unfortunately):
org.xml.sax.SAXException: FWK005 parse may not be called while parsing.
caught at DefinitionsFactoryException.java:251.
This SAXException implies the Xerces DocumentBuilder is being accessed
in two threads simultaneously which explains the intermittent nature
of the problem.
The failure to read the definitions then leads to a variety of other
Tiles-related exceptions until a moment later when the definitions are
correctly read. One guess is that Tiles is attempting to render a
page before it's properly initialized via the struts2-tiles-plugin.
Has anyone seen this before and able to suggest a way to make it go
away? There's no obvious consequences other than exceptions in the
log, but it's still annoying.
Below are examples of the other exceptions seen in association with
the one above. I presume they are all caused by the definitions not
being read yet and/or failing to render part of page due to that
(although I can't find a rationale explanation for the first one).
Thanks,
Jeromy Evans
2008-12-17 10:27:55,617 ERROR [http-8080-Processor24] [Digester] End
event threw exception
java.lang.NoSuchMethodException: No such accessible method:
addDefinition() on object: org.apache.tiles.Definition
at
org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:
214)
---
2008-12-17 11:05:50,675 ERROR [http-8080-Processor24]
[DefinitionsImpl] Error while resolving definition inheritance: child
'admin.page.head' can't find its ancestor 'page.head'. Please check
your description file.
---
2008-12-17 11:10:12,545 ERROR [http-8080-Processor25]
[RenderTagSupport] Error during rendering
java.util.EmptyStackException
at org.apache.commons.collections.ArrayStack.pop(ArrayStack.java:127)
at org.apache.commons.digester.Digester.endElement(Digester.java:1208)
