Latest Articles

InvalidIsolationLevelException: Standard JPA does not support custom isolation levels - use a special JpaDialect for your JPA implementation

02 January 2014

In this article we will see how to fix InvalidIsolationLevelException: Standard JPA does not support custom isolation levels - use a special JpaDialect for your JPA implementation.

As the exception clearly states, Standard JPA does not support custom isolation levels, so when we use an isolation level that is different from the default we will get the following exception: Inval... Read more

Spring - Change transaction isolation level example

02 January 2014

In this article we will see how to effectively change Spring transaction isolation level, together with JPA, while avoiding InvalidIsolationLevelException: Standard JPA does not support custom isolation levels - use a special JpaDialect for your JPA implementation.

As we have seen previously on Spring transaction isolation level tutorial, Spring supports the definition of the transaction isolation level in service methods. What we might not expect at first is th... Read more

java jpa spring tx

Spring + JPA + Hibernate example

27 December 2013

In this tutorial we will configure Spring with JPA using Hibernate as our JPA implementation.

Spring framework supports the persistence layer to be fully implemented through JPA. In this article we will see how to configure the Spring needed components to perform persistence over standard JPA,... Read more

hibernate java jpa spring tx

Java Lock example

18 December 2013

In this tutorial we will see how to synchronize access to shared resources using a Lock implementation in Java.

We have seen before in Java explicit lock example how to implement a lock using only the synchronized statement together with the wait/notify idiom. Since Java 5, several facilities became bundled wit... Read more

concurrency java

Spring AOP pointcut advice example

12 December 2013

In this tutorial we will see how to configure Spring AOP pointcuts and advices with parameter binding through supported AspectJ annotations.

Spring AOP provides a powerful and flexible pointcut and advice configuration. We have seen previously how to configure Spring AOP advices in the following article: Spring AOP example. In that previou... Read more

aop java spring

Spring AOP example

05 December 2013

In this tutorial we will see how to use Spring AOP through supported AspectJ annotations.

One of the main features of the Spring Framework is the Aspect Oriented Programming (AOP) paradigm. It's main purpose is to aggregate sections of code that would be usually repeated in multiple places... Read more

aop java spring

Java volatile example

28 November 2013

In this tutorial we will see how to use the volatile keyword in Java.

The volatile keyword (or strictly speaking, the volatile modifier) means that a single variable is supposed to be accessed by multiple threads concurrently.In order to achieve significant performance ... Read more

concurrency java

Java explicit lock example

17 November 2013

In this tutorial we will implement an explicit lock in Java using the synchronized statement together with the wait/notify idiom.

Before Java 5 - where the java.util.concurrent package concurrency facilities were introduced - we had to implement locking mechanisms from scratch. Even now when Java already offers a robust locking ... Read more

concurrency java

About the author

Gonçalo Marques is a Software Engineer with several years of experience in software development and architecture definition. During this period his main focus was delivering software solutions in banking, telecommunications and governmental areas. He created the Bytes Lounge website with one ultimate goal: share his knowledge with the software development community. His main area of expertise is Java and open source.

GitHub profile: https://github.com/gonmarques

He is also the author of the WiFi File Browser Android application: