[seam-dev] Some profiling of blocking threads

Emmanuel Bernard emmanuel at hibernate.org
Thu Sep 25 10:01:14 EDT 2008

On  Sep 25, 2008, at 09:17, Jay Balunas wrote:

>> org.ajax4jsf.application.AjaxViewHandler
>> --------------------------------------------
>>  - This was not a large % of the blocked threads but caught my eye  
>> as a potential trouble spot because it seemed directly related to  
>> ajax calls.
>>  - This was easier to track down and the root cause is in the  
>> org.ajax4jsf.application.ViewHandlerWrapper class.
>>  - see http://anonsvn.jboss.org/repos/richfaces/trunk/framework/api/src/main/java/org/ajax4jsf/application/ViewHandlerWrapper.java
>>  - The problem is all the calls to "fillChain" which is a  
>> synchronized method in the class.
>>  - We need to find out how often the "_initialized" field is false  
>> - is this once a request, once for each component, etc...
>>  - it appears to be called many times - I will look further into  
>> this.
> I will raise this the richfaces dev guys, and see what can be done.

Using the double check lock pattern with a volatile should make things  
better. It has to be done right though :)
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