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Using @NamedEntityGraph to load JPA entities more selectively in N+1 scenarios

The N+1 problem is a common issue when working with ORM solutions. It happens when you set the fetchType for some @OneToMany relation to lazy, in order to load the child entities only ...

Spring 4: CGLIB-based proxy classes with no default constructor

In Spring, if the class of a target object that is to be proxied doesn’t implement any interfaces, then a CGLIB-based proxy will be created. Prior to Spring 4, CGLIB-based proxy classes ...

Java EE7 and Maven project for newbies – part 7

Resuming from the previous parts Part #1, Part #2, Part #3, Part #4, Part #5 , Part #6 In the previous post (num 6) we discovered how we can unit test our JPA2 domain model, using ...

Hibernate and UUID identifiers

Introduction In my previous post I talked about UUID surrogate keys and the use cases when there are more appropriate than the more common auto-incrementing identifiers. A UUID database ...

Java SE 8 new features tour: Functional programming with Lambda Expression

This article of the “Java SE 8 new features tour” series will deep dive into understanding Lambda expressions. I will show you a few different uses of Lambda Expressions. They all ...

Getting an Infinite List of Primes in Java

A common problem is to determine the prime factorization of a number. The brute force approach is trial division (Wikipedia, Khan Academy) but that requires a lot of wasted effort if ...

Parsing an Excel File into JavaBeans using jXLS

This post shows how you can use jXLS to parse an Excel file into a list of JavaBeans. Here is a generic utility method I wrote to do that:                 /** * ...

Tracing SQL statements in JBoss AS 7 using a custom logging handler

Using an ORM to abstract from your specific database and to let it create and issue all the SQL statements you would have to write by hand yourself seems handy. This is what made ORM ...

Spring Integration Java DSL sample – further simplification with Jms namespace factories

In an earlier blog entry I had touched on a fictitious rube goldberg flow for capitalizing a string through a complicated series of steps, the premise of the article was to introduce ...

Adding @atomic operations to Java

Overview How might atomic operations work in Java, and is there a current alternative in OpenJDK/Hotspot it could translate to. Feedback In my previous article on Making operations ...
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