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Working with Amazon Web Services (EC2)

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As posted before I attended to a technical handson AWS training last week. The subjects during these days were of course the standard EC2 and S3 services which I have used before. Added to that we worked with RDS, Elastic Load Balancing, SNS and VPC, Elastic Beanstalk and discussed a lot of terminology and business cases. In this post I ...

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Evaluating new frameworks, libraries and technologies

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Introduction New frameworks and libraries are developed so fast it is nearly impossible to evaluate all of them. This can make it hard to judge whether a particular technology is worth investing (time) in. This post gives you some tips which may help when evaluating new technology. Conceptual level Although there are many different libraries and frameworks, most of them ...

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JPA 2.0 Criteria Query with Hibernate

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Criteria Query has been introduced in JPA 2.0. With the help of criteria queries you can write your queries in a type-safe way. Before criteria queries, developers had to write queries through the construction of object-based query definitions. There might be chances of incorrect syntax while building the queries. The criteria query API provides feature to create structured and nested ...

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Spring Integration – Apache Camel comparison

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A year after v2.1 had been released, Spring Integration v2.2 is out with 3 new components MondoDB, Redis and JPA (even though the first 2 were listed also in v2.1 as message store, now they are available as Inbound and Outbound Channel Adapters), retry and other new features. As a comparison Apache Camel has also released v2.10 during the same ...

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Ganglia configuration for a small Hadoop cluster and some troubleshooting

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Ganglia is an open-source, scalable and distributed monitoring system for large clusters. It collects, aggregates and provides time-series views of tens of machine-related metrics such as CPU, memory, storage, network usage. You can see Ganglia in action at UC Berkeley Grid. Ganglia is also a popular solution for monitoring Hadoop and HBase clusters, since Hadoop (and HBase) has built-in support ...

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How to Use PropertyNamingStrategy in Jackson

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Jackson api is used extensively to convert json to Object and Object to JSON.So if you have a json string and want to convert it in a java object , create field names of bean same as the fields in json. Jackson follows standard bean convention in mapping json fields to java object fields , but if you have a ...

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Monitoring the monster with RHQ

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The classical RHQ setup assumes an agent and agent plugins being present on a machine (‘platform’ in RHQ-speak). Plugins then communicate with the managed resource (e.g. an AS7 server); ask it for metric values or run operations (e.g. ‘reboot’). This article shows an alternative way for monitoring applications at the example of the Ticket Monster application from the JBoss Developer ...

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Telecommuting, Hoteling, and Managing Product Development

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There are two sides of this conversation about telecommuting: the employee side and the management side. I hope you stick around for both sides. You can yell at me at the end. Employees: You Owe the Company a Full Day of Work I’ve been thinking since Marissa Meyer’s announcement what I would say about the end of telecommuting at Yahoo!. ...

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FitNesse your ScalaTest with custom Scala DSL

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This article won’t be about FitNesse. As matter of fact I don’t like this tool very much and it seems to be loosing momentum, judging by the traffic on an official mailing list. Instead we will implement trivial internal DSL on top of Scala to simplify testing code, inspired by DoFixture. DoFixture in FitNesse allows one to write very readable ...

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Function interface – A functional interface in the java.util.function package in Java 8

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I had previously written about functional interfaces and their usage. If you are exploring the APIs to be part of Java 8 and especially those APIs which support lambda expressions you will find few interfaces like- Function, Supplier, Consumer, Predicate and others which are all part of the java.util.function package, being used extensively. These interfaces have one abstract method, which ...

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