JPA and a First tier application performance problems

Well, this is the second time I am using the new blogging platform of Java.net. This time it was much easier and with less hurdle. I want to write about JPA, performance, caching and related things. Though it wont be very well organized but it may come useful for new JPA developers. recently I have assigned a task to work on performance problems of a first tier application and further extend it with some new forms and reports and address some usability glitch in the software. The application was developed by a company which no longer exists. The developer company was dissolved before they finishing the development cycles. The performance issue was very important for the customer, so I start investigating the performance problem first. First things first, I run the application on client machine and hell it was slow, very slow indeed. it took some 15 seconds for the application to open a Jframe with two auto completing JCombobox on it. I though maybe it is the first time I am accessing the database and application is trying to initialize a soft client side cache. So, I closed the JFrame and open it again. the result was almost the same. I checked network and DNS resolving was fast and no substantial network delay was in place. I thought the problem is either in a poor development or something is wrong on database machine. I asked an operator about the performance and I understand that is a data access problem. and I should focus ...

Date: September, 03 2009
Url: http://www.java.net/blog/kalali/archive/2009/09/03/jpa-and-first-tier-application-performance-problems

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