Jan 22, 2017
As a follow-up to my last post on a custom validator to check if a String contains XML, I like to elaborate on how I made the unit test so readable.
To repeat, here is part of the unit test again with the assertions highlighted:
@Test public void givenNoXml_notValid() { ValidatorFactory factory = Validation.buildDefaultValidatorFactory(); Validator validator = factory.getValidator(); TestObject testObject = new TestObject("This is no XML string"); Set<ConstraintViolation<TestObject>> violationSet = validator.
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Jan 21, 2017
This blog post will show you how to create a custom validator to check if a String contains valid XML using the Java Validation API.
Suppose you have a highly technical application that requires the user to enter some XML in a web form. You want to validate this on the client side, but also on the server side, since you should never trust your client.
For the purpose of the example, suppose you have this entity:
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May 5, 2016
We are using angular-datatables in a project. So far, we just returned all entities from the server’s REST controller (Using Spring Boot and Spring Data on the server side). I wanted to see how I could implement server side pagination to avoid returning all records at once.
I was lucky to find spring-data-jpa-datatables which makes it very easy to do.
First, add the dependency in your pom.xml:
<dependency> <groupId>com.github.darrachequesne</groupId> <artifactId>spring-data-jpa-datatables</artifactId> <version>2.
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Apr 1, 2016
If you want to unit test a ConstraintValidator with AssertJ, then you can use this custom validator to make the tests more readable:
import org.assertj.core.api.AbstractAssert; import javax.validation.ConstraintViolation; import java.util.Set; import java.util.stream.Collectors; public class ConstraintViolationSetAssert extends AbstractAssert<ConstraintViolationSetAssert, Set<? extends ConstraintViolation>> { public ConstraintViolationSetAssert(Set<? extends ConstraintViolation> actual) { super(actual, ConstraintViolationSetAssert.class); } public static ConstraintViolationSetAssert assertThat(Set<? extends ConstraintViolation> actual) { return new ConstraintViolationSetAssert(actual); } public ConstraintViolationSetAssert hasViolationOnPath(String path) { isNotNull(); // check condition if (!
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Sep 30, 2015
This post is a follow-up on my post EntryProcessors and EntryBackupProcessors with Hazelcast. In the comments, Peter Veentjer from Hazelcast gave me the idea to use an EntryProcessor to read part of the data. I will show you below how to best do this.
We start with a cache that has 10 User objects in it and we want to retrieve the user names of all users in the cache.
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Sep 29, 2015
Hazelcast has the concept of EntryProcessors (like Oracle Coherence). EntryProcessors allow to update cache entries without having to pull over the actual values. You move the processing to where the value lives and update the cache there.
Furthermore, Hazelcast has the notion of EntryBackupProcessor (which Coherence does not have).
To explain the usage of this, we will use a simple User class:
class User implements Serializable { private long id; private String name; private DateTime lastLoginTime; // getters and setters omitted } We will set the 'lastLoginTime' on the user by means of an EntryProcessor.
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Mar 24, 2015
I wanted to try out afterburner.fx, a JavaFX framework which describes itself as:
a minimalistic (3 classes) JavaFX MVP framework based on Convention over Configuration and Dependency Injection.
For this purpose I created a simple note taking application which looks like this when finished:
First off, the domain class that represents a Note:
public class Note { private long id; private String title; private String content; // Getter and setters ommitted I also made a NoteService to retrieve the current notes and update an existing note:
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Mar 13, 2015
Icons are a great way to spice up any UI. You can easily use the Font Awesome icons in JavaFX, by using the fontawesomefx library.
I will show a small example on how to use the icons in JavaFX code and how to apply some styling.
First import the library. I am using Maven, so I just add this dependency:
<dependency> <groupId>de.jensd</groupId> <artifactId>fontawesomefx</artifactId> <version>8.2</version> </dependency> We will start with a simple app that uses a BorderPane to put some content at the center and have a kind of header at the top:
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Nov 4, 2014
Spring Boot is really amazing for getting started quickly with a new Spring application. By default, your application is contained in a single jar when packaging it. This has some advantages, but what if you want a "classic" layout with a config folder (for your application.properties or logback.xml files) and a lib folder?
Getting Started This blog post will show you a way of doing this using Maven and the Maven Assembly Plugin.
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Jul 16, 2014
iTerm is great, but if you are working with a cluster of servers, it quickly becomes tedious to open an SSH session to each server and to configure splits so you can talk to all servers at once. Based upon the scripts here (but does not use splits) and here (but does not work with 7 servers which I needed in my case), I came up with the following AppleScript that works for me.
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