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JPQL Enhancements in JPA 2.1 and Java EE 7 (part 1 – JOIN ON)

java-interview-questions-answers

Java EE 7 is around for a few years already, and provides several very useful and long-awaited features, like entity graphs and better support for stored procedures and results mapping. For an overview, have a look at Thorben Janssen’s blog post. However, I’d like add a more detailed summary about features in the JPA query language. All of them are ...

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Default HotSpot Maximum Direct Memory Size

In my previous blog post Improved Documentation of HotSpot Options in Java 8, I wrote about the misunderstandings surrounding the HotSpot JVM‘s default setting for non-standard option -XX:MaxDirectMemorySize. In this post, I look at a simple way to determine the “default” maximum direct memory size in the HotSpot JVM. The Java 8 documentation for the Java launcher states the following ...

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The most important thing to know in Cassandra data modeling: The primary key

Patrick McFadin, Chief Evangelist for Apache Cassandra, DataStax Patrick is regarded as one of the foremost experts of Apache Cassandra and data modeling techniques. As the Chief Evangelist for Apache Cassandra and consultant for DataStax, he has helped build some of the largest deployments in the world. Previous to DataStax, he was Chief Architect at Hobsons, an education services company. ...

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Java EE 8 MVC: Working with form parameters

java-interview-questions-answers

In the previous two posts we saw how to work with query and path parameters in the upcoming Java EE MVC framework. This post focuses on form parameters. When you submit a web form using a post request, the form values are send as part of the request body. The media type (or content type) defines the format that is ...

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Evolution of Systems Integration

Systems integration has been a tough problem from the beginning of the use of software systems in the enterprises. This had taken many faces in the last coupe of decades and is still evolving as other factors of the computing. At the very beginning people used to design heterogeneous monolithic systems to automate certain parts of their business and the ...

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A Balanced Product Scorecard

Summary Product scorecards are an important product management tool: They help you track the performance of your product. Unfortunately, many scorecards show only financial and customer key performance indicators (KPIs). While these indicators are undoubtedly important, ignoring other KPIs can create distorted view of reality and result in wrong decisions. This articles introduces a balanced product scorecard—a scorecard that provides ...

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#NoEstimates episode 2 – THE ANSWERS

A normal person would expect that sharing free content doesn’t create controversy. Well this normal person is wrong. A couple of weeks back I shared a report on #NoEstimates based on my adoption experience in the last 2-3 years. I got some thanks, some praise, but mainly aggravation. I had noticed this trend before when tweeting about #NoEstimates, when a group of individuals taunted ...

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JUnit 5 – A First Look at the Next Generation of JUnit

In the beginning of February, the JUnit 5 (aka JUnit Lambda) team has published an alpha release. Since JUnit 4 is among the most used items in my toolbox I thought it might be worth to have a look at the next major release. I took the latest build for a spin and noted down the changes that I found noteworthy here. ...

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Contract First SOAP Service with Spring and Maven

1. Introduction In this tutorial, we will learn to implement a contract-first SOAP service application using JAX-WS, Spring and Maven. This is more of a design decision whether to use contract-first or code-first approach. The most notable benefit of using applying contract-first approach in developing a SOAP based web service application, is that the contract can be shared with the consumers/clients ...

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Constructor or setter?

It goes without saying that every object needs to be created before it can be used. It does not matter whether we are talking about a domain, frameworks, libraries or any other type of the classes. When your code is an Object-Oriented, those classes are only definitions of the objects. You cannot use objects before they are created. When we ...

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