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File Upload Example in Servlet and JSP

Uploading File to server using Servlet and JSP is a common task in Java web application. Before coding your Servlet or JSP to handle file upload request, you need to know little bit about File upload support in HTML and HTTP proto ...
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ADF: URL Task Flow Call with HTTP POST Method

As we know a bounded task flow can be invoked by some URL either directly from a browser or from some external application. This feature is enabled if task flow’s property “URL invoke” is set to “url-invoke ...
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A Simple Plugin System for Web Applications

We need to make multiple web-based projects with a lot of shared functionality. For that, some sort of a plugin system would be a good option (as an alternative to copy-pasting stuff). Some frameworks (like grails) have the option ...
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Observer Design Pattern in Java – Example Tutorial

Observer pattern is one of the behavioral design pattern. Observer design pattern is useful when you are interested in the state of an object and want to get notified whenever there is any change. In observer pattern, the object t ...
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Custom Deserializer in Jackson and validation

tl;dr: it is important to add input validation to custom json deserializers in Jackson. In RHQ we make use of Json parsing in a few places – be it directly in the as7/Wildfly plugin, be it in the REST-api indirectly via REST ...
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Servlet 3.0 Overview

Servlet 3.0 – has a bunch of ground breaking features that will ultimately change how developers will code and write JEE Web Applications – some might say that its conventions defy most of our understanding about how things ...
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Transactional caching for Camel with Infinispan

Some time ago I created a Redis connector for Camel. Redis is awesome key-value store (and a lot more) but then I needed a cache running in the same JVM as Camel and noticed Infinispan which has just switched to ASL v2. There are ...
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Iterator Design Pattern in Java – Example Tutorial

Iterator pattern in one of the behavioral pattern and it’s used to provide a standard way to traverse through a group of Objects. Iterator pattern is widely used in Java Collection Framework where Iterator interface provides met ...
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Broken Glass : Diagnosing Production Cassandra Issues

I just past my second year anniversary at Health Market Science (HMS), and we’ve been working with Cassandra for almost the entirety of my career here.   In that time, we have had remarkably few problems with it.  Like few ...
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Java Exception Handling Tutorial with Examples and Best Practices

Exception is an error event that can happen during the execution of a program and disrupts its normal flow. Java provides a robust and object oriented way to handle exception scenarios, known as Java Exception Handling. We will lo ...
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