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Grails – GORM Tutorial

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Grails is known as domain driven language that means we can build application using bottom to top approach which is more nearer to object oriented programming. GORM (Grail Object Relational Mapping) uses intern Hibernate to map the domain with table which gives life to Domain modeling. If we combined everything just only based on domain we could build the whole ...

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Spring Data REST in Action

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What is spring-data-rest? spring-data-rest, a recent addition to the spring-data project, is a framework that helps you expose your entities directly as RESTful webservice endpoints. Unlike rails, grails or roo it does not generate any code achieving this goal. spring data-rest supports JPA, MongoDB, JSR-303 validation, HAL and many more. It is really innovative and lets you setup your RESTful ...

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Android Custom Loader to Load Data Directly from SQLite Database

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Today we’ll discuss about custom loaders in Android. Loaders have been introduced from Android 3.0 but we can also use loaders in prior versions of Android starting from Android 1.6 with the help of Android compatibility library. In this tutorial we won’t discuss the basics of loader which is vastly available in the Internet. A very good tutorial on loaders ...

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An argument against defaulting to auto-increment primary keys

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The de-facto “easy” primary key for ages has been the auto-incrementing integer. Upon insertion of a new record, the database simply increments a counter for the table and uses the new value for the primary key of the inserted row. It’s simple to setup, requires no maintenance, and guarantees a predictable key. For my own purposes, I was under the ...

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SOA and REST with Grails

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I discussed on my previous article about REST and how to leverage RESTful web services on Grails platform. We will further discuss Grails on SOA & REST and try to visualize architecture in details. REST and SOA are different architecture pattern with lots of commonality to make application highly interoperable. As per Thomas Erl SOA is “SOA is a term ...

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10 Common Mistakes Java Developers Make when Writing SQL

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Java developers mix object-oriented thinking with imperative thinking, depending on their levels of: Skill (anyone can code imperatively) Dogma (some use the “Pattern-Pattern”, i.e. the pattern of applying patterns everywhere and giving them names) Mood (true OO is more clumsy to write than imperative code. At first) But when Java developers write SQL, everything changes. SQL is a declarative language ...

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Jersey Client: Testing external calls

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  Jim and I have been doing a bit of work over the last week which involved calling neo4j’s HA status URI to check whether or not an instance was a master/slave and we’ve been using jersey-client.   The code looked roughly like this:           class Neo4jInstance { private Client httpClient; private URI hostname; public Neo4jInstance(Client ...

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Why REST is so important

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This post is dedicated to REST, an architectural style of shaping webservices and the most misunderstood concept in the history of IT. This post is addressed to you who is designing webservice apis not being fully aware what REST actually means. I’m trying to give you the idea. This post is also addressed to you who think to know what ...

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Securing HTTP-based APIs With Signatures

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I work at EMC on a platform on top of which SaaS solutions can be built. This platform has a RESTful HTTP-based API, just like a growing number of other applications. With development frameworks like JAX-RS, it’s relatively easy to build such APIs. It is not, however, easy to build them right.   Issues With Building HTTP-based APIs The problem ...

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Getting Started with Google GSON

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In Java world,  JSON is becoming de facto standard for data exchange format over XML because of its ease of use and efficiency in terms of transferring it. If you don’t know about JSON, it is Javascript object notation, a text based data exchange format which is collection of name-value where name is strictly of string type and value can ...

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