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Thoughts on Blueprint and Declarative Services: Dependency injection or Dependency management

I’ve been using the OSGi Blueprint for a couple of years now and I have been happy with it. Blueprint is the obvious choice inside Apache Karaf and since it was a solution that ...
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Architecting a Multi-tenant Application

A multi-tenant application is an application where a single running instance serves many customers. An alternative to multi-tenancy is managed services, where one running instance is ...
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Crashing your JVM

Thorough testing can be harmful as we discovered recently. Extending our test coverage led us to a several-hours debugging session caused by just one line of code. What made the debugging ...
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Building and testing a websocket server with undertow

The upcoming version of JBoss Application Server will no longer use Tomcat as integrated webserver, but will replace it with undertow. The architecture of undertow is based on handlers ...
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Auditing Entities in Spring Data MongoDB

Spring Data MongoDB 1.2.0 silently introduced new feature: support for basic auditing. Because you will not find too much about it in official reference in this post I will show what ...
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Two things to remember when using Java RMI

This is a short blog post about two common pitfalls you should be aware of when using Java RMI. Setting java.rmi.server.hostname If you are getting strange Connection refused to host: ...
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Struts2 Interview Questions and Answers

Struts2 is one of the famous framework for developing web application in java. Recently I have wrote a lot of Struts2 Tutorials and in this post, I am listing down some of the important ...
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Preventing System.exit calls

When developing containers that run code written by other developers it is prudent to safe-guard against System.exit calls. If a developer inadvertently calls System.exit and deploys ...
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Why I never blame open source projects

Every now and then I get to read someone’s bad thought towards a given open-source framework. When I started programming Struts web framework was at its prime, everybody loved it. ...
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Spring Security – Behind the scenes

Security tasks such as authentication of user and authorization of a user to view application resources are usually handled by the application server. These tasks can be delegated to ...
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