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Introduction : How to save data in your Android application

This is the first post in a series explaining the various ways to save data and application state in an Android application. There are many mechanisms in the Android SDK that can be ...
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Cluster-wide Java/Scala application deployments with Docker, Chef and Amazon OpsWorks

Docker is great for running isolated containers on a single node. However, most software systems run on multiple nodes, so in addition to Docker, we need some way of specifying which ...
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Git : How to add commit in between old commits

I have a Git repository and need to rewrite my local history by inserting a new commit in between old commits. More specifically my sitatution is like this:               AB—BC—CD—EF ...
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Apache Ant tasks for JMX access

I wanted to invoke JMX operations from the Ant tasks. However finding usable ant tasks library as well as the usage was rather tricky. So let me share my experience to make things easier ...
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Testing with Aliens: How to test a JPA type converter with Arquillian

This post was written together with +Aslak Knutsen (@aslakknutsen). JPA type converters provide an easy way to define how an entity attribute gets persisted to the database. You can ...
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JavaMail can be evil (and force you to restart your app server)

JavaMail always had an interesting approach when it comes to its configuration. Basically you have to fill an untyped map or Properties structure and hope for the correct interpretation. ...
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10 things you can do to make your app secure: #3 Validate Input

This is part #3 of a series of posts on the OWASP Top 10 Proactive Development Controls. Your first line of defence against attacks should always be to check all data from untrusted ...
java-interview-questions-answers

Stop Trying to Emulate SQL OFFSET Pagination with Your In-House DB Framework!

I’m pretty sure you’ve gotten it wrong in numerous ways, so far. And you probably won’t get it right any time soon. So why waste your precious time on SQL tweaking, when you could ...
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Continuous Delivery: Unit Tests

In the previous article we explored static analysis as one of the first steps in Continuous Delivery. Our journey will continue with unit tests. Unit Tests Unit tests are probably the ...
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Hibernate Debugging – Finding the origin of a Query

It’s not always immediate why and in which part of the program is Hibernate generating a given SQL query, especially if we are dealing with code that we did not write ourselves. This ...
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