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JMeter Tutorial for Load Testing – The ULTIMATE Guide

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This tutorial is about JMeter. These are the main points that we are going to cover: We are going to explain what is JMeter used for. How is JMeter implemented and with what technologies is designed. How to install and configure it properly. We are going to explain the basic features of its user interface. We will detailed explain how ...

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Akka Notes – DeathWatch – 7

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When we talked about Actor lifecycle, we saw that Actors could be stopped by various means (using ActorSystem.stop or ActorContext.stop or sending a PoisonPill – there’s also the Kill and the gracefulStop). Whatever reason an Actor dies, there are cases when a few other actors in the system would like to know about it. Let’s take a trivial example of ...

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How to setup custom SSLSocketFactory’s TrustManager per each URL connection

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We can see from javadoc that javax.net.ssl.HttpsURLConnection provided a static method to override with setDefaultSSLSocketFory() method. This allow you to supply a custom javax.net.ssl.TrustManager that may verify your own  CA certs handshake and validation etc. But this will override the default for all “https” URLs per your JVM! So how can we override just a single https URL? Looking at ...

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From Java 7 Futures to Akka actors with Scala

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This blog post will show you how a step by step transition from a “java 7 and j.u.c.Future” based implementation to an “akka actor written in scala solution” looks like. It will take four steps, which are:                 Java 7 and futures Java 8 and parallel streams Scala and futures Scala and actors ...

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Server side logging from browser side JavaScript code

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Application logging is something we all do in our applications that get deployed on an application server, right? Using frameworks like Log4J or Logback seems like a no-brainer to most Java developers. But what about the code we’ve written that is running in those pesky browsers? I guess that, apart from the occasional console.log() statement used during debugging, we don’t ...

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Spring from the Trenches: Using Null Values in DbUnit Datasets

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If we are writing integration tests for an application that uses Spring Framework, we can integrate DbUnit with the Spring testing framework by using Spring Test DbUnit. However, this integration is not problem free. Often we have to insert null values to the database before our tests are run or verify that the value saved to the specific table column ...

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How to Upload Images to DropBox In Java

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This Tutorial explains how to upload images to drop box and get the public url of uploaded image . First of all we have to create a DropBox API app using app console. Once you create the app , you can get App key and secret key in the app properties . Now add following dependency in your pom file. ...

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FREE Programming books with the JCG Newsletter

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Here at Java Code Geeks we know how much you love books about programming; we are geeks ourselves. After all, a programmer that respects himself should always have his face in a book, he has to keep up with the latest technologies and developments. For this reason, we have decided to distribute 11 of our books for free. You can ...

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The Drools and jBPM KIE Apps platform

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With the Drools and jBPM (KIE) 6 series came a new workbench, with the promise of eventual end user extensibility. I finally have some teaser videos to show this working and what’s in store. Make sure you select 1080p and go full screen to see them at their best.                 What you seen ...

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Beginner’s Guide To Hazelcast Part 1

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Introduction I am going to be doing a series on Hazelcast. I learned about this product from Twitter. They decided to follow me and after some research into what they do, I decided to follow them. I tweeted that Hazelcast would be a great backbone for a distributed password cracker. This got some interest and I decided to go make ...

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