Showing posts from September, 2014

JVM Garbage Collection and Optimizations

Overview When troubleshooting systems for performance-related issues, memory optimizations are a place that needs a deep analysis of what each system stores in the memory, how long those are stored, and access patterns. This post is to keep a note on the background information and valuable points to note in such an effort, specific to Java-based implementations as a deep understanding of the JVM behaviors is very beneficial in the process.

Java language provides much convenience to the developers by taking care of the memory management to a great extent letting the focus be on the rest of the logic. Still having a good understanding of how Java does this underneath, rationalize several best practices we follow in Java implementations and help design the programs better and think seriously on some aspects that can later lead to memory leaks and system stability in the long run. Java Garbage Collector has a big role in this been responsible for freeing up memory by removing memory gar…

Leveraging federation capabilities of Identity Server for API gateway - Configuration Details

With this post I am to share the steps of a popular solution using WSO2 Identity Server and WSO2 API Manager. Following diagram will give an initial insight on this solution. Overview

1.  Webapp that requires single sign on(SSO) facility with some other applications. 
                - To achieve this we are using WSO2 Identity Server(IS) as the Identity Provider(IDP). 
2.  Webapp needs to consume some APIs secured with OAuth tokens.                  - To expose the APIs secured with OAuth tokens we are using WSO2 API Manager(AM) here.
                - Since we already have the SAML Response received at SSO step, SAML2 Bearer grant type is ideal to use at this scenario to request an OAuth token to access the required APIs.                 - Allowing AM to properly issue an OAuth token in this scenario, we add IS as a trusted IDP in AM.
3.  Webapp requires to allow users registered in another IDP like Facebook or Google to be able to login with SSO functionality.                  - With mini…

How to write a Custom SAML SSO Assertion Signer for WSO2 Identity Server

This is the 3rd post I am writing to explain the use of extension points in WSO2 Identity Server. WSO2 Identity Server has so many such extension points which are easily configurable and arm the server with lot of flexibility. With this, we can support so many domain specific requirements with minimum efforts. Firstly I have shared the usage and steps of writing a custom user store manager. Secondly a custom claim handler which is also related with SAML SSO Response. Now this third post deals with writing a custom SAML SSO Assertion signer. What we can customize? Credentials used to sign the SAML Assertion (The private key)Signing AlgorithmThis sample can be extended to customize how we sign the SAML Response and validate the signature as well. How? We have to write a class extending  The class '' or Implementing, The interface '' Needs to ove…