Paulo Cesar Dias Lima

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since Jul 06, 2010
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Recent posts by Paulo Cesar Dias Lima

Hi Ritchie and Scott, thanks for your attention.
I have Java 1.4 and Java 6 Programmer Certifications.
And also I use generics since Java 5 and 6.
I' planning to get JAVA 11 OCP.

My concern about Generics is if features like Generic Specialization, Reified Generics that I just hear about from Valhalla project.

But I'm not sure if its important for JAVA 11 OCP Exam.

Thanks again,

Paulo.
Jeanne Boyarsky and Scott Selikoff In your opnion which are the new features of the Java language that 1Z0-815 exam could cover?

Should we focus study and practices about Java features like the modules, generics, and functional programming?

Best regards,

Paulo.
Hanumant Deshmukh congratulations on new book "OCP Oracle Certified Professional Java SE 11 Programmer I Exam Fundamentals 1Z0-815" .
Regards and I wish you success.
Which JDK version should I use ? JDK 12 or 11 ? To practices coding to OCP 11 EXAMS? Does it matter?

I m working in a project using JDK 12 and also will study to OCP 11 EXAM. I wondering If I could use the JDK 12 for both goals.

Hanumant Deshmukh congratulations on new book "OCP Oracle Certified Professional Java SE 11 Programmer I Exam Fundamentals 1Z0-815" .
Regards and I wish you success.
Hi Ritchie. I mean Java EE Server side apps.

How to apply new features like common logging system, light-weight JSON API, HTTP 2 Client support  for Java EE apps. Will be available only to Java EE 9?

Thanks.
4 years ago
Whats the best aproach to refactor existing apps to get advantage of Java 9 modularity?
4 years ago
Batch Applications for the Java Platform (JSR 352) vs. EJB Timer Service (java.ejb.Schedule or java.ejb.Schedules annotations.)
I would like to know if is there some recommendation regards the possibility to integration between EJB Timer Service that needs to start a Batch Applications.

Other concern is about if it possible to check the status of execution (running, finished, wait) before EJB timer invokes a Batch process.

Is it possible to Batch process invoke (call back) a EJB method or post a JMS message when finished ?

I checked that JobExecution interface provides methods check status, but I not found a way to notify or register a listener for job conclusion.

Regards,

Paulo Lima.
Hi James!

Welcome to JavaRanch and Congratulations for your excellent book!

Canvas, SVG, and WebGL on HTML5 Rocks!

Also I visited your blog http://jameswilliams.be/blog

Very nice blog and useful information!

Regards,

Paulo Lima.
Welcome, Ferraro and Aktihanoglu !

Congratulations for you excellent book.

I just read MEAP_Ch01.pdf 1. Location Based Services—past, present and future - FREE is very interesting!

This subject is very updated and fashioned with actual Mobile and Web applications requirements.

I wish you much continued success and many others books published!

Regards,

Paulo Lima.
10 years ago
Hauke, some users feel more confortable with webapp since most of them uses WEB 2.0 sites and services like emails, search engines, Internet bank, and so on. Some users request WEB 2.0 interfaces and GWT is a strong reference to some then.

Also some components that are free and available to Web/GWT for Swing requires comercial desktop components library.

And as I said regarding Server integration and uses Java EE services I guess that GWT is ready to it since conception.

I like Java Swing to Desktop and Client/Server solutions, also developed some projects builded with J2SE/Swing and only standard Java API (Java IO, RMI, Swing) and several long nights of Java Coding!

Just to focus and go back to topic, I guess that GWT it's not the best choice to my project but for some specific users requirements (like Web experience) could an option and can be done.

All, just to clarify my project is a POS Desktop system coded in Java Swing and integrated with Java Server Side application that mannager stock, sales, taxes, and reports. Both implemented with J2SE. I plan to implement a new version do GWT on client and Java EE on server.

I'm know that Java EE isn't the panacea (a remedy that would cure all diseases) but not the worst.

Regards,

Paulo.
11 years ago
GWT
Subin, my goal is to implement a RIA and improve GUI with WEB 2.0 including GWT and others visual controls that provides better user experience that Swing. I don't know Adobe Flex, my skill is 100% Java and C/C++ actually.

Maneesh, each client machine will have an embedded server to facilities communication with a Central server and access JNDI, JMS, and other container server.

Nowadays I use Socket and RMI instead of Java EE integration support. I konow that It's not a refactory, It's a brand new project.

Thanks,

Paulo.
11 years ago
GWT
Subin, thanks for your answer.

I plan to deploy each desktop client machine a servlet embedded server like Tomcat, Jetty, or other.

So each machine will be a lightweight Embeddable Servlet Engine running both Client GWT and Server API to access Serial and USB APIs.

My concern is about if this approach will give more flexible and robust result than Java Swing application.

I plan to go ahead with GWT just for practice and also have a comparation experience to apply.

Also I did some homework regarding this comparation

http://creamtec.com/products/ajaxswing/solutions/swing_to_GWT_and_AJAX.html
http://www.mia-software.com/en/solutions/modernization/migration-to-gwt/


Thanks,

Paulo.

11 years ago
GWT
Hi Federico Kereki.

I need to migrate a Java Swing/Desktop to a Java GWT web application but my concern is about how to access Serial and USB port using GWT.

It's is possible to use a GWT Java application to access Java Communications API (javax.comm) or RXTX directly ?

Do you think that GWT direct access to Serial ports it's a good approach or instead of I should use service server class (like Servlet/Proxy IO) to do this job ?

Thanks,

Paulo.
11 years ago
GWT
Jeanne, correct I runned them once a time.

I agree that batch update is integrated so no way to catch individually commands error.

I'm trying to change my Persistence Tier to instead of use JDBC refactory to Stored Procedure that will result the number of rows on Insert/Update/Delete (CRUD) and also using a Queue process like Oracle Advanced Queuing (AQ) to notifies Erros to subscribers Java process.

I have to process a huge amount off request and very short ansewers time!

What do you think about this approach ?

Bill, do you think that using Queuing to catch/notify Huge amount of SQL commands it's a good option ?

I'm not sure if there is a SQL Patterns indicated to this scenario.

Thanks!

Paulo Lima.