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Monitoring Key JVM Characteristics with Groovy, JMX, and RuntimeMXBean

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Since J2SE 5, Platform MBeans have been available that allow some key characteristics regarding the JVM to be monitored and (even managed in some cases) via JMX. In addition, many JVM-based applications add their own JMX-enabled features for monitoring and management. In the blog post Groovy, JMX, and the Attach API, I looked at how to display many of the ...

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Basic concepts of OpenLDAP

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LDAP LDAP is just a type of database specialized for look ups. Reads are fast while writes are supported but relatively slow. That’s why LDAP is commonly used to store centralized user accounts. In LDAP, data is stored nodes (much like a record in a relational DB). Each node has some named attributes. For example, a node representing a user ...

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Basic IPv6 concepts

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Basic concept IPv6 is a completely separate protocol from IPv4! It means that the configuration and operation of IPv6 have nothing to do with those of IPv4 at all. They will run independently just like IPv4 and IPX or AppleTalk. Format of IPv6 address An IPv6 address contains 128 bits and is written in 8 groups of 16 bits like ...

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Maximizing the work NOT done

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One of the principles of the Agile Manifesto makes the seemingly paradoxical statement: “the art of maximizing the amount of work not done”. This statement is part of the 10th principle of this Agile Manifesto. The complete 10th principle reads as follows: “Simplicity–the art of maximizing the amount of work not done–is essential” When I first heard this statement it ...

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Introduction to Functional Interfaces – A concept recreated in Java 8

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Any java developer around the world would have used at least one of the following interfaces: java.lang.Runnable, java.awt.event.ActionListener, java.util.Comparator, java.util.concurrent.Callable. There is some common feature among the stated interfaces and that feature is they have only one method declared in their interface definition. There are lot more such interfaces in JDK and also lot more created by java developers. These ...

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Why Time Is No Measure For Progress

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One of the questions that Project Managers always pop up during projects is: “how many days will it take to finish this work?”. This is a very natural and sensible question. You want to know when a project will be finished, so people can have an expectancy of the needed budget, what functionality is in it and when it will ...

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REST with Apache Camel

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There are many ways to expose an HTTP endpoint in Camel: jetty, tomcat, servlet, cxfrs and restlet. Two of these components – cxfrs and restlet also support REST semantics just with few lines of code. This simple example demonstrates how to do CRUD operations with camel-restlet and camel-jdbc. The four HTTP verbs execute different operations and map to the following ...

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A 3 Step Guide to Getting Started with NoSQL

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I have been looking in to NoSQL databases for few months and would like to share my experience with it. This is a post might help you if you indent to start learning about the NoSQL Databases. I would try to link the resources which I found useful here. Step 1: What is NoSQL? NoSQL DEFINITION: Next Generation Databases mostly ...

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Indexing data in Solr from disparate sources using Camel

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Apache Solr is ‘the popular, blazing fast open source enterprise search platform’ built on top of Lucene. In order to do a search (and find results) there is the initial requirement of data ingestion usually from disparate sources like content management systems, relational databases, legacy systems, you name it… Then there is also the challenge of keeping the index up ...

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