Matt, > However, if your app is like mine probably a dozen or so connections are opened for each Action that is > performed, so it's hard to ensure you are closing all connections correctly.
Do you really have that many nested result sets? If not, then you could reuse the same connections for some of your queries. Reagards, Richard -----Original Message----- From: Sgarlata Matt [mailto:[EMAIL PROTECTED] Sent: Thursday, September 18, 2003 9:26 AM To: Struts Users Mailing List Subject: Re: Tool to diagnose J2EE/Struts/Oracle problem Hi again Stella, Let me start by saying that I am also using Struts and Oracle, so we have a similar setup. We were experiencing the same problems you were experiencing until we set up connection pooling. I highly recommend that you develop your app using the org.apache.commons.dbcp.AbandonedObjectPool because it is the only way to make sure you are dealing with connections correctly. To use connections properly you must close them when you are done and this class makes sure you do, otherwise it starts throwing exceptions. For more information, see http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-how to.html#Database%20Connection%20Pool%20(DBCP)%20Configurations in the section called "Preventing db connection pool leaks". For production we are using the pool that comes with Oracle's application server, release 2. Also, additional comments to your specific questions are below. ----- Original Message ----- From: "Au-Yeung, Stella H" <[EMAIL PROTECTED]> To: "'Struts Users Mailing List'" <[EMAIL PROTECTED]> Sent: Thursday, September 18, 2003 12:10 PM Subject: RE: Tool to diagnose J2EE/Struts/Oracle problem > Matt: > You mentioned the following: > >> Garbage collection does not release database connections. > > IN that case, do you know who releases the connections and make it available > for re-use after conn.close() has been done. It sounds like you must > have read from somewhere that said GC doesn't release connections. To the best of my knowledge conn.close() should close the connection so that it no longer displays as a used connection in Oracle. However, if your app is like mine probably a dozen or so connections are opened for each Action that is performed, so it's hard to ensure you are closing all connections correctly. This is where the AbandonedObjectPool I discussed earlier comes into play. The GC won't call conn.close() for you, and you probably just forgot to close connections in a few places. Even after practicing for weeks I still forget to close connections weekly and AbandonedObjectPool comes to the rescue :) > Stella > > > -----Original Message----- > From: Sgarlata Matt [mailto:[EMAIL PROTECTED] > Sent: Wednesday, September 17, 2003 10:56 PM > To: Struts Users Mailing List > Subject: Re: Tool to diagnose J2EE/Struts/Oracle problem > > > You should investigate using connection pooling, such as is offered by > the DBCP project, which is a Jakarta Commons subproject. Garbage > collection does not release database connections. I'm not sure on all > the details why > not, but there are other reasons to use connection pooling such as > performance. > ----- Original Message ----- > From: "Au-Yeung, Stella H" <[EMAIL PROTECTED]> > To: "Struts Users Mailing List" <[EMAIL PROTECTED]> > Sent: Wednesday, September 17, 2003 10:52 PM > Subject: Tool to diagnose J2EE/Struts/Oracle problem > > > > I am havng a No resource Available problem with my J2EE/Struts/Oracle > > application. It is saying I don't have any more Oracle connections > > available. Even I am closing the result set, statement and connection, I > > am still running into the problem. When I use the Oracle DBA monitor > tool, > > it shows that I have 10 'inactive' connection but then my app will > > give > the > > 'no resource available' error. So it looks like somehow it is not > reusing > > those inactive connections. Does Gabage Collection release those > > connections? Does anyone have this problem before? > > > > So I am looking for a better 'tool' to find out why GC doesn't > > release > those > > connections or if those 10 'inactive' connections are actually > > available > to > > be re-used. Can someone give me a suggestion on this tool or how to > > troubleshoot the problem? > > > > Thanks > > Stella > > > > > > -------------------------------------------------------------------- > > - > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
