WL 4.5.1 Hangs on repeated Refresh!! Help!!

Question

Hi,
I am due to deploy a two tier app (JSP/Servlets) in a few days. I use
weblogic 4.5.1 on a Solaris box (1GB RAM, 2 processor). The server starts
with a heap of 512MB, noclassgc. The app works beautifully; but, on a
particular page (quite DB intensive; and I use connection pooling), if I hit
refresh repeatedly, the server just donesn't return any html after a while.
the server does't hang or crash; it just doesn't do anything. I twiddled
with many weblogic properties including executeThreadCount (i set it to 25),
connection pool sizes.. etc...
All my JSPs get a connection from the pool and close it at the end. I also
have a connection.close() in the finally block. Also, the weblogic console
shows that the connections are being release fast. But, I did notice that
the poolSize never increaed from the initial size even though I have set
capacityIncremet to 1. Please help!!!
Here is my sample .jsp code:
<%import stuff%>
<%System.out.println("Begin-------");%>
<%
get connection from connection pool
prepare statement
rs=ps.executeQuery()
iterate through rs
display in html table
close resultset
close statement
close connection
finally{
close connection
System.out.println("End--------");
%>
When I load this page, I see both the "Begin---" and "End----" lines on the
weblogic log. But, when I start hitting refresh before I see any HTML on
the browser, I see only a bunch of "Begin-----"s and NO "End-----" at
all!!!!!! I am not instantiating any user defined classes in the .jsp. the
sqlq query is not an expensive one either. What's going on???
I did some further investigation and noticed that If I hit stop (after WL
stops responding) and go to any .jsp that doesn't require a connection pool,
it works!! I saw from some newsgroup thread abt. the
weblogic.system.httpThreadCount. I tried this too; no avail.
Please HELP!!!
Thanks so much!,
Shrisha
Shrisha Radhakrishna
mailto:[email protected]
mailto:[email protected]
http://members.tripod.com/cricforum
[phone] (Off)
[phone] (Cell)

Answer 1

I do have a try block and I close resultset, prepared statement, and
connection in all pages.. :-)).. Also, I did a thread dump and noticed
that all the executeThreads were waiting at the executeQuery() statement.
Thanks!,
Shrisha
"Wei Guan" <[email protected]> wrote in message
news:[email protected]...
>
>
Cheers - Wei
Shrisha Radhakrishna <[email protected]> wrote in message
news:[email protected]...
Hi,
I am due to deploy a two tier app (JSP/Servlets) in a few days. I
use
weblogic 4.5.1 on a Solaris box (1GB RAM, 2 processor). The serverstarts
with a heap of 512MB, noclassgc. The app works beautifully; but, on a
particular page (quite DB intensive; and I use connection pooling), if Ihit
refresh repeatedly, the server just donesn't return any html after awhile.
the server does't hang or crash; it just doesn't do anything. I
twiddled
with many weblogic properties including executeThreadCount (i set it to25),
connection pool sizes.. etc...
All my JSPs get a connection from the pool and close it at the end. Ialso
have a connection.close() in the finally block. Also, the weblogicconsole
shows that the connections are being release fast. But, I did notice
that
the poolSize never increaed from the initial size even though I have set
capacityIncremet to 1. Please help!!!
Here is my sample .jsp code:
<%import stuff%>
<%System.out.println("Begin-------");%>
<%
get connection from connection pool
prepare statement
rs=ps.executeQuery()
iterate through rs
display in html table
close resultset
close statement
close connection
finally{
close connection
System.out.println("End--------");
}where is your try and catch block???
put
close resultset
close statement
close connectioninto your finally block and you don't need them in try block.
I don't know it is related or not.
When WL 4.5.1 hangs, do a thread dump, read the call stack and you might
spot something useful.
%>
When I load this page, I see both the "Begin---" and "End----" lines onthe
weblogic log. But, when I start hitting refresh before I see any HTML
on
the browser, I see only a bunch of "Begin-----"s and NO "End-----" at
all!!!!!! I am not instantiating any user defined classes in the .jsp.the
sqlq query is not an expensive one either. What's going on???
I did some further investigation and noticed that If I hit stop (after
WL
stops responding) and go to any .jsp that doesn't require a connectionpool,
it works!! I saw from some newsgroup thread abt. the
weblogic.system.httpThreadCount. I tried this too; no avail.
Please HELP!!!
Thanks so much!,
Shrisha
Shrisha Radhakrishna
mailto:[email protected]
mailto:[email protected]
http://members.tripod.com/cricforum
[phone] (Off)
[phone] (Cell)