Coffee Insignts @invaad - Tumblr Blog

Some useful links on concurrency

http://tutorials.jenkov.com/java-concurrency/volatile.html

http://winterbe.com/posts/2015/04/30/java8-concurrency-tutorial-synchronized-locks-examples/

•18+ Adults Only

Watch Anya Live on Cam

Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.

✓ Live Streaming✓ Interactive Chat✓ Private Shows✓ HD Quality✓ Free Actions

Free to watch • No registration required • HD streaming

Java 8 was released in March 2014 and introduced lambda expressions as its flagship feature. This article sheds light on how Java 8 lambda expressions and method references are implemented under the hood, and looks at the generated bytecode and performance implications.

Lambdas vs Anonymous Inner Classes

#java 8 lambda

Hadoop example

Installing on Windows

Good guide: https://wiki.apache.org/hadoop/Hadoop2OnWindows

But I couldn't make 2.6.0 work. Had to use this distribution of 2.3.0:

Distrib: https://drive.google.com/file/d/0Bz7A6rJcTjx_Q0RDT0FrU3dUTDQ/edit

Settings: https://github.com/prabaprakash/Hadoop-2.3-Config/archive/master.zip

Compiling example and running

Maven project to run: https://github.com/jmaister/wordcount

1. Need to package to jar (mvn jar:jar)

2. With admin rights, run from drive with hadoop:

\sbin\start-dfs.cmd \bin\hdfs dfs -put any-file-with-words.txt /

\bin\hdfs dfs -ls /

\sbin\start-yarn.cmd

3. Run job from console: hadoop jar wordcount.jar com.jordiburgos.WordCount /myfile.txt output

4. Check results with Hadoop Web GUI: http://localhost:50070/

Good to read in addition:

https://hadoopi.wordpress.com/2013/05/25/setup-maven-project-for-hadoop-in-5mn/

#hadoop #wordcount #example #maven #java

Guide to calculating the memory usage of a Java object.

#java memory usage

•18+ Adults Only

Watch Anya Live on Cam

Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.

✓ Live Streaming✓ Interactive Chat✓ Private Shows✓ HD Quality✓ Free Actions

Free to watch • No registration required • HD streaming

Explains the internal architecture of the Java Virtual Machine (JVM) in simple terms using showing key components and how memory is updated during execution.

#JVM

Online reprints of the book by Bill Venners: A programmer's guide to the Java's architecture and the Java virtual machine, including class loaders, threads, linking model, garbage collection, and security.

#JVM

Generics and type erasure

No generics in bytecode. Type erasure: http://docs.oracle.com/javase/tutorial/java/generics/erasure.html

#generics #type erasure #java

Understanding bytecode instrumentation (weaving)

1. http://technoga.wordpress.com/2012/12/01/what-is-bytecode-instrumentation/

2. http://stackoverflow.com/questions/18423019/how-to-enable-load-time-runtime-weaving-with-hibernate-jpa-and-spring-framewor

3. http://www.nurkiewicz.com/2009/10/yesterday-i-had-pleasure-to-participate.html

#java #weaving #instrumentation

Cheat sheet on public speaking

http://9gag.com/gag/a1Zd8jb?ref=android

•18+ Adults Only

Watch Anya Live on Cam

Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.

✓ Live Streaming✓ Interactive Chat✓ Private Shows✓ HD Quality✓ Free Actions

Free to watch • No registration required • HD streaming

Must reads on Java Garbage Collectors

1. http://www.fasterj.com/articles/oraclecollectors1.shtml

2. http://javarevisited.blogspot.com/2011/11/hotspot-jvm-options-java-examples.html

3. http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/gc01/index.html

4. http://redstack.wordpress.com/2011/01/06/visualising-garbage-collection-in-the-jvm/

5. http://shipilev.net/blog/archive/visualvm/

#java #garbage collection

Java exceptions in a nutshell

#java exceptions

Were did you put those strings?

String literals are interned.As of Java 7, the HotSpot JVM puts interned Strings in the heap, not permgen.

Prior to java 7, hotspot put interned Strings in permgen. However, interned Strings in permgen were garbage collected. Apparently, Class objects in permgen are also collectable, so everything in permgen is collectable, though permgen collection might not be enabled by default in some old JVMs.

String literals, being interned, would be a reference held by the declaring Class object to the String object in the intern pool. So the interned literal String would only be collected if the Class object that referred to it were also collected.

source: Thread

#GC #Java #string pool

Getting started with my own cloud app on Goolge App Engine

1. https://developers.google.com/appengine/docs/java/gettingstarted/creating

2. http://www.mkyong.com/spring3/spring-3-mvc-hello-world-example/

3. https://developers.google.com/appengine/docs/java/gettingstarted/ui_and_code

#app

•18+ Adults Only

Watch Anya Live on Cam

Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.

✓ Live Streaming✓ Interactive Chat✓ Private Shows✓ HD Quality✓ Free Actions

Free to watch • No registration required • HD streaming

This is called a road :) Near the Kurortne village of Odes'ka region.

#ukrainian roads

212 hit

Trending Blogs

Last Seen Blogs

Coffee Insignts