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  JEP draft: Prepare to Restrict The Use of JNI article placeholder If enough people want this article, I will write about it and how you can use the new API instead of using JNI.

The excellent VisualVM tool has moved to Github https://visualvm.github.io/

The JVM Language Summit 2015 just happened. The videos are already up on YouTube. It is a very technical conference with the JVM wizards, on such topics as JVM languages and the future of the JVM.

With Oracle JDK 7, I see the usual VM options for 32 or 64-bit and -server to specify the server class JVM. With OpenJDK 7, I found it interesting to see quite a few more JVM options: Wikipedia: List of Java virtual machines Wikipedia: JamVM

Charles Oliver Nutter - Fast as C: How to write really terrible Java In this talk, we’ll explore the main reasons why Java code rarely runs as fast as C or C++ and how you can write really bad Java code that the JVM will do a better job of optimizing. We’ll take some popular microbenchmarks and burn them to the ground, monitoring JIT logs and assembly dumps along the way. vimeo Java talk video

At work, a couple of long time experience Java devs were having build issues. They didn't know where their build system was pulling in a class from. They didn't know that the JVM has a verbose class loading option. If you run java -h, you will see this in the output:     -verbose:[class|gc|jni]                  enable verbose output If you invoke your JVM like this: java -verbose:class myHelloWorld then the output will be very verbose as the class loader prints out detailed of all the classes loaded during startup and during the finding and running of your class. e.g. [Loaded java.net.URLConnection from /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/rt.jar] [Loaded sun.net.www.URLConnection from /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/rt.jar] [Loaded sun.net.www.protocol.file.FileURLConnection from /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/rt.jar] [Loaded sun.net.www.MessageHeader from /usr/lib/jvm/j...

It can be helpful to consider the Java Memory Model when thinking about multithreading. It is being refreshed for Java 9: The OpenJDK Revised Java Memory Model JSR 133 https://jcp.org/en/jsr/detail?id=133 JSR 133 Cookbook Wikipedia: Java memory model

It's amazing to hear that Java is 20 years old already. If you used it and took a break and now want to get back into Java again, the following link could help as a learning refresher: JavaWorld: Learn Java from the ground up Java 20th anniversary #Java20 Update Your Skills for the 20 Years of Java

Java has evolved a lot over 20 years, the latest Java 8 is another large evolution of the JVM and the language. Java Source says that it's time to update your Java skills :-) Update Your Skills for the 20 Years of Java

A couple of videos about how you could contribute to the Java platform. Talks about the JCP and OpenJDK: How to Contribute to the Java Platform

First session: How is Java/JVM built? Second session: What's coming in Java.Next? Two Live Streaming Java Sessions from vJUG

infoq: Using a Graph Database for JVM Heap Analysis

Java is pass by value, dammit! stackoverflow: Is Java “pass-by-reference” or “pass-by-value”?

infoq: Peter Lawrey Describes Petabyte JVMs

Brian Goetz blog post: State of the Specialization

Some tips on setting JAVA_HOME on Solaris 11: Oracle Blog: JAVA_HOME on Solaris 11

The Java Memory Model JLS: Threads and Lock http://en.wikipedia.org/wiki/Java_Memory_Model Java theory and practice: Fixing the Java Memory Model, Part 1 http://www.javaworld.com/article/2092274/java-platform/fixing-the-java-memory-model.html

https://blogs.oracle.com/hinkmond/entry/how_to_build_your_own Part 1 of 8.

How to Become an Embedded Developer in Minutes Related: Java SE Embedded downloads

http://tech.puredanger.com/java7