On 17.01.2008 05:45, Harald Entner wrote:
In normal mode everything runs fine. But when running a jmeter test with
40 concurrent users, the AbstractWidgetDefinitionBuilder throws a
NullPointerException. see the full stacktrace at (1)
java.lang.NullPointerException
at
org.apache.cocoon.forms.formmodel.AbstractWidgetDefinitionBuilder.setupDefinition(AbstractWidgetDefinitionBuilder.java:109)
(... see 1)
Probably the reason for this error is that the function
public WidgetDefinition buildWidgetDefinition(Element widgetElement,
WidgetDefinitionBuilderContext context)
throws Exception {
it is not thread-save.
I tried the same test with a little modification (buildWidgetDefinition
is synchronized)
public synchronized WidgetDefinition buildWidgetDefinition(Element
widgetElement, WidgetDefinitionBuilderContext context)
throws Exception {
The error (1) doesn't occur anymore, but another one: (see 2) It seems
that the cause for this is very similar to the one above.
Has one of you seen this error when running a stress test? What could i
do to avoid that problem? (i could go on and modify this function to
synchronized as well, but hopefully there is a better solution for this. )
Hmm, this does not look good but like a major flaw in Cocoon Forms.
Following the Javadoc of WidgetDefinitionBuilder implementations of this
interface have to be thread-safe - which they are not because of the
context field. There is one quick fix you can do: Make the context a
ThreadLocal variable.
Joerg
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