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Spring Batch – Replacing XML Job Configuration With JavaConfig

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I recently assisted a client in getting up and running with a Spring Batch implementation. The team had decided to move forward with a JavaConfig-based configuration for their batch jobs instead of the traditional XML-based configuration. As this is becoming a more common approach to configuring Java applications, I felt it was time to update Keyhole’s Spring Batch series to show you how ...

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The Features Project Jigsaw Brings To Java 9

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So, Project Jigsaw… We already know quite a bit about it but have not yet seen the details of how it plans to deliver on its promises. This post will do precisely that and present the project’s core concepts and features. Series This post is part of an ongoing series about Project Jigsaw. In the recommended order (which is different ...

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Writing a download server. Part III: headers: Content-length and Range

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We will explore more HTTP request and response headers this time to improve download server implementation: Content-length and Range. The former signals how big the download is, the latter allows downloading files partially or continue after failure from where we started.       Content-length response header Content-length response header is tremendously helpful for clients that track download progress. If ...

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7 Monitoring Tools to Prevent Your Next Production Doomsday

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What are some of the most useful monitoring tools for Java developers? Monitoring is an essential function in production environments today. Errors and performance issues pop up all the time – not just during business hours – so good monitoring tools need to be active 24/7. There are a lot of tools out there that tackle this issue from different ...

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How To Stream/Serialize JPA Result As JAX-RS Response For Large Data

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There are times that retrieving a large data set through JPA is necessary (e.g. more than 1,000,000 records) and having them stuffed into a single instance of java.util.List is just risky (memory barrier). So, here’s a quick solution of how a JAX-RS REST resource end-point could still give us a timely Response without breaking the memory constrain through streaming or ...

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The Prolonged Death Spiral Business Model

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I recent message from a friend tells me he is putting on his parachute. He can’t take it anymore. He’s tried hard, very hard, to change a challenged company. Actually, I know a little bit more about this company than I should. I once told him that working there was like being aircrew in Catch-22: Only the sane should work ...

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R: Speeding up the Wimbledon scraping job

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Over the past few days I’ve written a few blog posts about a Wimbledon data set I’ve been building and after running the scripts a few times I noticed that it was taking much longer to run that I expected. To recap, I started out with the following function which takes in a URI and returns a data frame containing ...

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The Philosophy of the CUBA Platform

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A huge amount has happened recently. Following the official launch of CUBA on 1st of June, we have rolled out a new release, published our first article on a few Java sites and presented the platform at the Devoxx UK сonference in London. But before the rush continues, about it is an apt time to articulate the philosophy behind CUBA. ...

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Generating JSON Schema from XSD with JAXB and Jackson

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In this post, I demonstrate one approach for generating JSON Schema from an XML Schema (XSD). While providing an overview of an approach for creating JSON Schema from XML Schema, this post also demonstrates use of a JAXB implementation (xjc version 2.2.12-b150331.1824 bundled with JDK 9 [build 1.9.0-ea-b68]) and of a JSON/Java binding implementation (Jackson 2.5.4). The steps of this ...

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Strategy Pattern in Java 8

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These are two examples on how to implement a Strategy pattern design using Java 8 functional style together with Cyclops pattern matching and Hamcrest libraries. PrintDependingOnInput method is a strategy that will System.println some message based on the log passed. AddPrefix is another strategy that will add a prefix to a message based on the message content. package com.marco.patternmatching; import ...

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