nuwanzone.blogspot.com

charithaka.blogspot.com

Charitha Kankanamge's blog: Common mistakes to avoid in WSO2 API Manager - "ERROR - APIAuthenticationHandler API authentication failure" for a API call with valid access token

http://charithaka.blogspot.com/2014/03/common-mistakes-to-avoid-in-wso2-api.html

Service Oriented Architecture (SOA) and Software Testing without nonsense. Thursday, March 27, 2014. Common mistakes to avoid in WSO2 API Manager - "ERROR - APIAuthenticationHandler API authentication failure" for a API call with valid access token. In the third post of the common mistakes to avoid in WSO2 Carbon platform. Let's look at the problem in detail. Suppose I'm calling a REST API hosted in WSO2 API Manager. With a set of query parameters as shown below. After saving the configuration in file sy...

isuru-perera.blogspot.com

Isuru's Blog: Java CPU Flame Graphs

http://isuru-perera.blogspot.com/2015/07/java-cpu-flame-graphs.html

Isuru's Blog on Java, Performance, Life etc! Wednesday, July 22, 2015. Java CPU Flame Graphs. Update (September 14, 2015):. Java 8 Update 60 was released on August 18, 2015. There are some recent changes to "perf-map-agent". There is no longer a script named "perf-java" and you should use "bin/create-java-perf-map.sh. Shared an exciting news in his Monitorama. Talk: The " JDK-8068945. Is fixed in Java 8 Update 60 Build 19. The Problem with Java and Perf. Missing these Java symbols is one of the main prob...

isuru-perera.blogspot.com

Isuru's Blog: Installing Oracle JDK 7 (Java Development Kit) on Ubuntu

http://isuru-perera.blogspot.com/2014/01/installing-jdk7-on-ubuntu.html

Isuru's Blog on Java, Performance, Life etc! Thursday, January 16, 2014. Installing Oracle JDK 7 (Java Development Kit) on Ubuntu. There are many posts on this topic if you search on Google. This post just explains the steps I use to install JDK 7 on my laptop. From Oracle. The latest version as of now is Java SE 7u51. I'm on 64-bit machine, therefore I downloaded jdk-7u51-linux-x64 .tar.gz. It's easy to get the tar.gz package as we just have to extract the JDK. Sudo mkdir -p /usr/lib/jvm cd /usr/lib/jvm...

isuru-perera.blogspot.com

Isuru's Blog: January 2015

http://isuru-perera.blogspot.com/2015_01_01_archive.html

Isuru's Blog on Java, Performance, Life etc! Tuesday, January 27, 2015. Java Mission Control and Java Flight Recorder. Last year, I got two opportunities to talk about Java Mission Control and Java Flight Recorder. I first talked about " Using Java Mission Control and Java Flight Recorder. As an internal tech talk at WSO2. I must thank Srinath. For giving me that opportunity. After that, Prabath. Also invited me to do a talk at Java Colombo Meetup. I'm also very excited to see that Marcus Hirt. Print a s...

isuru-perera.blogspot.com

Isuru's Blog: "Subversion Native Library Not Available" Error on Eclipse (with Subclipse) Ubuntu

http://isuru-perera.blogspot.com/2014/02/subversion-native-library-not-available.html

Isuru's Blog on Java, Performance, Life etc! Thursday, February 27, 2014. Subversion Native Library Not Available" Error on Eclipse (with Subclipse) Ubuntu. Do you use Eclipse. Do you encounter following error:. Subversion Native Library Not Available". Now if you go to Eclipse - Preferences - Team - SVN, you will see that "JavaHL (JNI) is Not Available" for SVN interface. The solution is to install JavaHL. Sudo apt-get install libsvn-java sudo ln -s /usr/lib/x86 64-linux-gnu/jni/* /usr/lib/. Nevindaree ...

isuru-perera.blogspot.com

Isuru's Blog: July 2015

http://isuru-perera.blogspot.com/2015_07_01_archive.html

Isuru's Blog on Java, Performance, Life etc! Wednesday, July 22, 2015. Java CPU Flame Graphs. Update (September 14, 2015):. Java 8 Update 60 was released on August 18, 2015. There are some recent changes to "perf-map-agent". There is no longer a script named "perf-java" and you should use "bin/create-java-perf-map.sh. Shared an exciting news in his Monitorama. Talk: The " JDK-8068945. Is fixed in Java 8 Update 60 Build 19. The Problem with Java and Perf. Missing these Java symbols is one of the main prob...

isuru-perera.blogspot.com

Isuru's Blog: Installing Multi-Node OpenStack Folsom with DevStack

http://isuru-perera.blogspot.com/2013/04/openstack-multi-node-devstack.html

Isuru's Blog on Java, Performance, Life etc! Friday, April 26, 2013. Installing Multi-Node OpenStack Folsom with DevStack. These days we are preparing to release WSO2 Stratos 2.0 PaaS Foundation and we needed to install OpenStack in multiple nodes in our lab environment. In this guide I'm going to explain how to install OpenStack Folsom using the DevStack. Script [1] and also how to install additional Compute Nodes. Earlier we used Damitha's guide. 4] from DevStack failed. When we run DevStack script...

isuru-perera.blogspot.com

Isuru's Blog: Installing NS-2 on Ubuntu

http://isuru-perera.blogspot.com/2013/05/installing-ns-2-on-ubuntu.html

Isuru's Blog on Java, Performance, Life etc! Saturday, May 4, 2013. Installing NS-2 on Ubuntu. In this year I started following the Master of Computer Science ( MCS. At University of Colombo School of Computing and these days I'm following a module named "Advanced Concepts in Data Communication Networks". The lecturer asked us to install a program called NS-2 and to play around with it as we will get an assignment on it soon! As usual when I hear a new name, I just googled. Installing NS-2 - The Hard Way!

isuru-perera.blogspot.com

Isuru's Blog: June 2015

http://isuru-perera.blogspot.com/2015_06_01_archive.html

Isuru's Blog on Java, Performance, Life etc! Friday, June 5, 2015. In this blog post, I'm briefly introducing important concepts in Java Garbage Collection (GC) and how to do GC Logging. There are many resources available online for Java GC and I'm linking some of those in this post. Why Garbage Collection is important? This memory management is a part of "Automatic Garbage Collection", which is an important feature in Java. It is important to know how Garbage Collection manages memory in our programs.

isuru-perera.blogspot.com

Isuru's Blog: February 2015

http://isuru-perera.blogspot.com/2015_02_01_archive.html

Isuru's Blog on Java, Performance, Life etc! Friday, February 27, 2015. Java Flight Recorder Continuous Recordings. When we are trying to find performance issues, it is sometimes necessary to do continuous recordings with Java Flight Recorder. Usually we debug issues in an environment similar to a production setup. That means we don't have a desktop environment and we cannot use Java Mission Control for flight recording. Get a dump manually from JFR.dump diagnostic command via " jcmd. XX: UnlockCommercia...