Hi David Thanks for the reply. I have been having some limited success with EclipseLink. I dump all queries from mysql into a log file and watch it with tail -f /var/log/mysql/querylog. Simple technique and I can see all queries being executed on the server when I run my project using Eclipselink when I do a entitymanager.find(SomeClass.Class, Value) call the JPA provider does not execute any SQL on the server.
If I run it with openJPA I can see SELECT col1,col2 FROM SomeClassTable WHERE PrimaryKey =Value being executed. Now I am running geronimo 2.2.1 and I think the built in caching is probably a JPA2 specification. I might be wrong here. However as we are dealing with a system where data are mostly read only caching would be a great performance booster. I tried installing the OpenJPA2 plugins for Geronimo but they have some issue. So I am kind of stuck. Will let you know what I find out as I progress. Regards Neil On Tue, 2011-03-01 at 00:32 -0800, David Jencks wrote: > Hi Neil, > > As far as I know openJPA and EclipseLink are both really good JPA > implementations. I wasn't aware that either one provided data caching > without add on products, but I'm not an expert in either product. In > geronimo you are probably more likely to be able to find help using openjpa > because the geronimo developers know it better and openjpa is another apache > project. Other than that guess I don't have much advice on a choice. > > thanks > david jencks > > On Feb 28, 2011, at 10:53 PM, Neil Franken wrote: > > > Hi All > > > > I need some help to make up my mind about what technologies to use in my > > project. Now there is going to be some rather newbie questions in here > > but I need some input from people that work with the technology. > > > > Here is my problem. We are doing a project that requires us to use JPA. > > Now I need the JPA to be able to cache data to reduce the load on the > > MySQL servers. So over the last couple of days I have been doing a lot > > of porting of code from a Glassfish v3 and eclipselink project to > > Geronimo. > > > > However going through the documentation I had a look a OpenJPA as well. > > It seems that openJPA is also a very good product.... so my main > > question is. > > > > Which one is better to use in Geronimo.I know OpenJPA is allready > > available in Geronimo and from what I can find on the internet it seems > > to be a viable alternative to EclipseLink. > > > > So can anyone here shed some light on the choice I have to make? Seems > > like Java programmers in South Africa just use JDBC so finding someone > > to have a decent discussion about JPA/ORM Frameworks leads nowhere fast. > > > > Regards > > Neil > > >
