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How to use EJB 3 timer in a weblogic 10 cluster environment
Although there are some articles talking about EJB 3 timers or job schedulers , we were not able to find any detailed instructions on how to make EJB 3 timer work in a weblogic cluster. In this article...
View ArticleHow to Fix Java POJO Annotations
POJO and Annotation are a big part of the java world nowadays. Spring, EJB, JPA, Servlet, JSF and other technologies are using annotated POJOs. The traditional definition is that a POJO is an...
View ArticleJPA NoResultException marks transaction rollback in WebLogic 10.3.2
The weblogic 10.3.2 server comes with two jpa implementations: eclipselink (org.eclipse.persistence_1.0.0.0_1-2-0.jar) and openjpa (org.apache.openjpa_1.0.1.0_1-1-1-SNAPSHOT.jar). By default, it uses...
View ArticleHow to invoke local EJB session beans in WebLogic
Sometimes you may have a need to invoke a LOCAL EJB session beans in a normal java class, for example, Business Delegate class, you can use ServiceLocator to locate a local EJB session bean proxy by...
View ArticleString getBytes could lead to difficult bugs
If you execute the following function, what do you think should be the size of the 'def' byte array?The logic is really simple: an input as byte array that have two elements, then create a string out...
View ArticleFirst impressions on open source ESBs
Used commercial ESB and BPMs for a couple of years, recently had a chance to evaluate some open source ESBs.WSO2: not easy to use, had difficulty even making the sample projects to work. No DataMapper...
View ArticleCompile xsl files and store in cache to improve XSLT performance
Common code found online to do XSLT transformation. (removed non essential pieces for brevity)------------------TransformerFactory transformerFactory = TransformerFactory.newInstance();Transformer...
View ArticleSpring MVC UTF-8
Key pointsweb.xml: <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>...
View ArticleString valueOf() pitfalls
What will the console output of this program?public class TestStringValueOf {public static void main(String[] args) {testStringValueOfChar();} public static void testStringValueOfChar() {char a =...
View ArticleMachine Learning
Machine LearningPurpose Machine Learning is to generalize.Classic Problem Normal Programming: "Hello world" Machine Learning: MNISTApproach Problems --> Tools--->Metrics (apply to...
View ArticleSQL vs NOSQL (DynamoDB)
This is not about the detailed comparison between SQL and NOSQL. There are a lot of articles online already regarding this topic. This is about my experience with SQL and NOSQL. I primarily used...
View ArticleAWS useful articles
Lambda with RDS https://www.jeremydaly.com/reuse-database-connections-aws-lambda/ https://www.jeremydaly.com/manage-rds-connections-aws-lambda/ Good part: database connection management...
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