Prior to JDK8 class metadata and constants would live in an area called the “permanent generation”, contiguous with the Java heap. One problem was that If the class metadata size is beyond the allocated bounds your app would run out of memory. With the advent of JDK8 we no longer have PermGen. The space where it was held has now moved to native memory to an area known as the “Metaspace”.
In this article, we look at the HotSpot Java Virtual Machine, and its implementation in the OpenJDK, both from a VM perspective and also in terms of its interaction with the Java class libraries.
In the world of application delivery, performance tuning still eludes the mainstream. InfoQ spoke to 5 luminaries of the performance monitoring space about it. The result was quite an active debate. 1
Michael Slinn examines how to benchmark JVM concurrency options for JVM-based langauges including Java and Scala. 2
In this Q&A Martin Odersky draws the comparisons between F# and Scala, discusses the future of Scala, and addresses once and for all the question of breaking binary compatibility. 1
Java Performance, by Charlie Hunt and Binu John, provides performance tuning advice for both Java SE and EE applications. InfoQ reviews the book, and talks to the authors about their approach.
We talked with Martin Odersky, Chairman, Chief Architect and co-founder of Typesafe, about Scala.Net, the version of Scala that support .Net as well as about Scala in general.
While still a major user of Ruby and Rails, Twitter has gradually been moving more and more of its stack to Java and Scala. InfoQ spoke to Twitter engineer Evan Weaver to find out more. 13
InfoQ examines how Azul's collector works, and explores some techniques you can use to test the impact of garbage collection in your applications.
InfoQ caught up with Charles Nutter to talk about the state of JRuby: the 1.5 release, Ahead of Time compilation, and what's coming up in 1.6 and with features in Java 7.