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Posted to dev@geronimo.apache.org by Neal Sanche <ne...@nsdev.org> on 2005/06/17 09:04:18 UTC
Transactions?
Hi All,
Okay, another rough spot found in my transition. I'm trying to create a
new CMP bean instance from my web app. But it needs a transaction to do
so. I suppose I could do the operation from within a Session bean method
(I probably will anyway), but is there a way to obtain a new Transaction
from within the web application's code? I was used to doing the following:
UserTransaction tx = null;
InitialContext ctx = null;
try {
ctx = new InitialContext();
tx = (UserTransaction)ctx.lookup("UserTransaction");
tx.begin();
chain.doFilter(request, response);
} catch (Throwable e) {
throw new ServletException(e);
} finally {
try {
if (tx != null)
tx.commit();
if (ctx != null)
ctx.close();
} catch (Throwable ex) {
throw new ServletException(ex);
}
}
Now that just throws a name not found for UserTransaction. How do I do
it with Geronimo?
Thanks in advance.
-Neal
Re: Transactions?
Posted by Dain Sundstrom <da...@iq80.com>.
On Jun 17, 2005, at 6:11 PM, Neal Sanche wrote:
> Dain Sundstrom wrote:
>
>> On Jun 17, 2005, at 12:04 AM, Neal Sanche wrote:
>>
>>> UserTransaction tx = null;
>>> InitialContext ctx = null;
>>> try {
>>> ctx = new InitialContext();
>>> tx = (UserTransaction)ctx.lookup("UserTransaction");
>>> tx.begin();
>>> chain.doFilter(request, response);
>>> } catch (Throwable e) {
>>> throw new ServletException(e);
>>> } finally {
>>> try {
>>> if (tx != null)
>>> tx.commit();
>>> if (ctx != null)
>>> ctx.close();
>>> } catch (Throwable ex) {
>>> throw new ServletException(ex);
>>> }
>>> }
>>
>> Is this a servlet filter? I don't believe it is legal to
>> propagate a tx out of a servlet filter (either down the chain or
>> up the chain).
>>
>> -dain
>>
>
> Really? I guess it's not very kosher, but it certainly helps
> simplify the code for the pages since while pages render, there's
> always a transaction available. There are some obvious side-effects.
Well, I don't think this works on all platforms. I remember
Websphere being very very very strict about transactions in the web
tier. One reason to not wrap an entire web request in a transaction
is you could end up holding the transaction open for a long time as
data is force flushed to a modem user. It is best to read/update all
the data in one isolated tight transaction and then render the page.
To maximize the transaction throughput you want to hold the
transaction open as short as possible.
Having said that. People do this all the time, and it should work in
Geronimo. It is way to common a pattern to not support.
> This 'not legal' statement is from a document somewhere Dain?
It is somewhere in the servlet spec. Just search for transaction.
They hardly ever mention transactions so it should be easy to find.
If it isn't in the servlet spec, check the J2EE spec.
-dain
Re: Transactions?
Posted by Neal Sanche <ne...@nsdev.org>.
Dain Sundstrom wrote:
> On Jun 17, 2005, at 12:04 AM, Neal Sanche wrote:
>
>> UserTransaction tx = null;
>> InitialContext ctx = null;
>> try {
>> ctx = new InitialContext();
>> tx = (UserTransaction)ctx.lookup("UserTransaction");
>> tx.begin();
>> chain.doFilter(request, response);
>> } catch (Throwable e) {
>> throw new ServletException(e);
>> } finally {
>> try {
>> if (tx != null)
>> tx.commit();
>> if (ctx != null)
>> ctx.close();
>> } catch (Throwable ex) {
>> throw new ServletException(ex);
>> }
>> }
>
>
> Is this a servlet filter? I don't believe it is legal to propagate a
> tx out of a servlet filter (either down the chain or up the chain).
>
> -dain
Really? I guess it's not very kosher, but it certainly helps simplify
the code for the pages since while pages render, there's always a
transaction available. There are some obvious side-effects. This 'not
legal' statement is from a document somewhere Dain?
-Neal
Re: Transactions?
Posted by Dain Sundstrom <da...@iq80.com>.
On Jun 17, 2005, at 12:04 AM, Neal Sanche wrote:
> UserTransaction tx = null;
> InitialContext ctx = null;
> try {
> ctx = new InitialContext();
> tx = (UserTransaction)ctx.lookup("UserTransaction");
> tx.begin();
> chain.doFilter(request, response);
> } catch (Throwable e) {
> throw new ServletException(e);
> } finally {
> try {
> if (tx != null)
> tx.commit();
> if (ctx != null)
> ctx.close();
> } catch (Throwable ex) {
> throw new ServletException(ex);
> }
> }
Is this a servlet filter? I don't believe it is legal to propagate a
tx out of a servlet filter (either down the chain or up the chain).
-dain
Re: Transactions?
Posted by Jeff Genender <jg...@savoirtech.com>.
Try to lookup "java:comp/UserTransaction"
Jeff
Neal Sanche wrote:
> Hi All,
>
> Okay, another rough spot found in my transition. I'm trying to create a
> new CMP bean instance from my web app. But it needs a transaction to do
> so. I suppose I could do the operation from within a Session bean method
> (I probably will anyway), but is there a way to obtain a new Transaction
> from within the web application's code? I was used to doing the following:
>
> UserTransaction tx = null;
> InitialContext ctx = null;
> try {
> ctx = new InitialContext();
> tx = (UserTransaction)ctx.lookup("UserTransaction");
> tx.begin();
> chain.doFilter(request, response);
> } catch (Throwable e) {
> throw new ServletException(e);
> } finally {
> try {
> if (tx != null)
> tx.commit();
> if (ctx != null)
> ctx.close();
> } catch (Throwable ex) {
> throw new ServletException(ex);
> }
> }
>
> Now that just throws a name not found for UserTransaction. How do I do
> it with Geronimo?
>
> Thanks in advance.
>
> -Neal
Re: Transactions?
Posted by David Jencks <da...@yahoo.com>.
I think the portable location is java:comp/UserTransaction
In geronimo we pretty much follow the spec that you can only look
things up under java:comp/
thanks
david jencks
On Jun 17, 2005, at 12:04 AM, Neal Sanche wrote:
> Hi All,
>
> Okay, another rough spot found in my transition. I'm trying to create
> a new CMP bean instance from my web app. But it needs a transaction to
> do so. I suppose I could do the operation from within a Session bean
> method (I probably will anyway), but is there a way to obtain a new
> Transaction from within the web application's code? I was used to
> doing the following:
>
> UserTransaction tx = null;
> InitialContext ctx = null;
> try {
> ctx = new InitialContext();
> tx = (UserTransaction)ctx.lookup("UserTransaction");
> tx.begin();
> chain.doFilter(request, response);
> } catch (Throwable e) {
> throw new ServletException(e);
> } finally {
> try {
> if (tx != null)
> tx.commit();
> if (ctx != null)
> ctx.close();
> } catch (Throwable ex) {
> throw new ServletException(ex);
> }
> }
>
> Now that just throws a name not found for UserTransaction. How do I do
> it with Geronimo?
>
> Thanks in advance.
>
> -Neal
>