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From "Kalcevich, Daniel" <dkalcev...@firstam.com>
Subject RE: What is RequestScope used for?
Date Tue, 06 Mar 2007 15:03:37 GMT
I found about this RequestScope through the profiler YourKit.  Here is
the trail that references the IBatis objects.


map of com.ibatis.sqlmap.engine.scope.RequestScope 

--[121] of java.lang.Object[513] 

---elementData of java.util.ArrayList 

----list of java.util.Collections$SynchronizedRandomAccessList 

-----pool of com.ibatis.common.util.ThrottledPool 

------requestPool of com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelega

------delegate of com.ibatis.sqlmap.engine.impl.SqlMapClientImpl 

-------client of com.ibatis.dao.engine.transaction.sqlmap.SqlMapDao

--------transactionManager of com.ibatis.dao.engine.impl.DaoContext 

---------[0] of java.lang.Object[11] 

----------elementData of java.util.ArrayList 

-----------value of java.lang.ThreadLocal$ThreadLocalMap$Entry 

------------[1442] of java.lang.ThreadLocal$ThreadLocalMap$Entry[2049] 

-------------table of java.lang.ThreadLocal$ThreadLocalMap 

--------------threadLocals of java.lang.Thread [Stack Local, Thread]



The reason I thought it might be contributing to a memory leak was the
fact that at every snapshot I take, the number of HashMaps continues to
increase without going down.  Then when I look at what it is referring
to, it points to the RequestScope.


While looking in the trace, I saw that it was referencing the
DaoContext's transaction Manager.  Could the Transaction Manager be
playing a part in this?  My application uses Spring with SQL Maps, but a
library we wrote uses the DAO Framework specifically.  The Spring
application does not use it.  I think that is worth looking into, given
what I see in the profiler.






From: Kalcevich, Daniel 
Sent: Monday, March 05, 2007 11:37 AM
To: 'user-java@ibatis.apache.org'
Subject: What is RequestScope used for?




I have a Spring, Struts, SQL Map application that runs on JBoss/Tomcat.
And while going through a profiler, I am seeing that there are several
instances of "com.ibatis.sqlmap.engine.scope.RequestScope".  What is
that object used for?  The reason I ask is that I am trying to track
down a memory leak and am wondering if this class is possibly part of
the cause?  Any help is greatly appreciated.  Thank you.



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