tx,context, aop...How to read spring xml namespace magic ?

For those of you who worked with spring application without spring boot, and remembers those times, when you had to make your configuration using xml - did you ever question yourself how the magic is done ? For instance, if you had to create a component scan, you had to do <context:component-scan base-package="com.yourpackage.blablabla" /> how it really did this component scan ? ######spring.handlers Answer is simple - if you really would like to know how context or any other spring namespace is working - always start from spring.handlers file. It’s present in each spring jar file, which have some namespaces. The more spring dependencies you add - the more spring.handlers files you will have In case of spring-context jar, you will have something like this http\://www.springframework.org/schema/context=org.springframework.context.config.ContextNamespaceHandler http\://www.springframework.org/schema/jee=org.springframework.ejb.config.JeeNamespaceHandler http\://www.springframework.org/schema/lang=org.springframework.scripting.config.LangNamespaceHandler http\://www.springframework.org/schema/task=org.springframework.scheduling.config.TaskNamespaceHandler http\://www.springframework.org/schema/cache=org.springframework.cache.config.CacheNamespaceHandler So, let’s choose component-scan attribute. ######component-scan component-scan is an attribute of context namespace, so, we need ContextNamespaceHandler /* * Copyright 2002-2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law...

Spring DATA Mongo. Testing your mongo using in-memory db

######Embeddable When I was a bit younger, I couldn’t understand why more senior engineers stood for embedding builds as much as it’s possible. For instance, you have a database, and you’re running your integration tests only with in memory databases. It was very unusual for me, why having a working database on your local machine, you’re using some weird in memory things ? The time have passed, and I understand now, that embedding your builds is a good practice, because: It reduce your build time It decouples your build phase from any environments Even if you don’t have any database/thirdparty tool installed on your local machine, your build will finish successfully, and after then you can start installing all required third party instruments. Fongo + NoSQl-Unit By this article I’d like to show how to effectively test your Spring DATA repositories using Fongo - an in-memory implementation. I’m not going to explain how Spring Data works, you can read their documentation here Say, you have following repository package org.example.repository; import org.springframework.data.mongodb.repository.MongoRepository; import org.springframework.data.mongodb.repository.Query; import org.startup.queue.domain.Establishment; import java.util.Optional; public interface SomethingRepository extends MongoRepository<Establishment, String> { Optional<Something> findByCol1(String col1); } Next, test it: package org.example.repository; import com.github.fakemongo.Fongo; import com.lordofthejars.nosqlunit.annotation.UsingDataSet; import com.lordofthejars.nosqlunit.core.LoadStrategyEnum; import...

Spectacleapp - forget about your mouse. OSX only.

If you’re interested in reducing interaction with your mouse - then use this program. Link - https://www.spectacleapp.com/ If you want easily locate your terminals - then it’s a good instrument for you PS - it’s especially useful to move app between your physical monitors. And in case of many Desktops. I found this on their github https://github.com/eczarny/spectacle/issues/15

Dockerizing your apps

Preface As some of you may already know, from the last autumn-2015 I’m working as a software engineer in startup company called Upwork, in one of teams. From the time I started working there, I realized, that working on freelance basis is completely different from office work, even if you’re working on a good quality freelance job. Why ? At least, because you cant share some knowledge with your coworkers by cuf of coffee in your lunch time. So I decided to convert my blog to some R&D investigation. That’s why I’d like to warn you, that everything here is just an investigation, which I do on my free time, so don’t take it so critically, if you find something, which you don’t agree with, just comment, and let’s discuss. Technologies are changing every day, and we need to follow the trend, don’t we ? Why containers ? Before I can proceed with explanation in my head what is the definition of container, let’s return to the near part times, where we did everything manually: the dyno age, where it was ok to assemble your proeject war manually, and deploy it to the server in the same way. Then, the...

How to work with maven javacc plugin

I had to do some work with google-visualization-java github project. I needed to change some logic for correct google visualization query. I found, that guys were using javacc compiler. Official site says: Java Compiler Compiler tm (JavaCC tm) is the most popular parser generator for use with Java tm applications. A parser generator is a tool that reads a grammar specification and converts it to a Java program that can recognize matches to the grammar. In addition to the parser generator itself, JavaCC provides other standard capabilities related to parser generation such as tree building (via a tool called JJTree included with JavaCC), actions, debugging, etc. To inject javacc inside your maven project, add following plugin <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>javacc-maven-plugin</artifactId> <version>2.5</version> <executions> <execution> <id>javacc</id> <goals> <goal>javacc</goal> </goals> <configuration> <sourceDirectory>${basedir}/src/main/java</sourceDirectory> </configuration> </execution> </executions> </plugin> Steps you need to do with your javacc project: Open terminal cd to project mvn clean generate-sources That’s it.