Marcelus Trojahn

FEATURED Blog

DFMW Series

September 14, 2019

by Marcelus Trojahn · Published September 14, 2019

Developing a Finance Management Website #5
Enhancing our Entities Let’s talk about Finder. It’s a feature from Ebean that allow us to enhance our entity with methods that will handle querying the database for that specific entity. With Kotlin, we can use it as a companion object to really make our life easier. Let me show you: Now my Script entity will have methods like all(), query(), byId(), update() and many more. Take a look on the someExamples function on the Gist above, pretty easy right? You could even create a ScriptFinder class extending Finder and create your own queries. In my case, I rather just...
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DFMW Series

September 5, 2019

by Marcelus Trojahn · Published September 5, 2019 · Last modified September 6, 2019

Developing a Finance Management Website #4
UML to Entity Hello everyone and welcome back. On today’s post I’m going to continue the development of a finance management website. For those who are just finding me, this is not your usual tutorial. This is a log of sorts of my activities and thinking while I develop this application. You will find novice to advanced information here and it will come slowly because, most of all, I want to log my thinking and practice writing. Our entities On my last post I guide us on creating a Ktor project. If you wanna have a look, it’s here and...
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DFMW Series

August 31, 2019

Creating a Ktor Project

Creating a Ktor Project.
Part #3 of the series “Developing a Finance Management Website”

Blog / DFMW Series

August 30, 2019

Developing a Finance Management Website #2

Classes and thoughts behind them This was originally posted on Medium. Let’s say I’m the neighborhood nerdy guy that occasionally fixes every neighbor’s computers, routers, printers and maybe even create some artwork on Photoshop or whatever. What do I need to know about my money? I need to know who paid me and what was the service I provided. I need to know where I bought some tool and how much it costed me. I need to keep track of Janet that pays me monthly to help her figuring out her own Excel spreadsheet. So, right now, in a very...

Blog / DFMW Series / Tutorial

August 30, 2019

Developing a Finance Management Website

#1 – Intro This was originally posted on Medium. From nothing to something. Hello readers. First of all, let me introduce myself. I’m Marcelus and I’ve been developing small automation solutions to local companies from my city for the past 2 decades. I’m self-taught on everything related to IT and I never stop learning new things. It’s kinda what I do. Ah, even English is self-taught so pardon me already if I make mistakes while I write this. I’m not, by any means, a writer but I always wanted to contribute with my knowledge to other people… And by that...

Tutorial

December 29, 2016

SpringBoot + Thymeleaf + i18n (Internationalization)

Hello again. This week I had to study how to implement i18n in a Spring Boot + Thymeleaf CRM application I am developing. Spring Boot really makes it easy to setup but while I was searching about it on the Web I found a lot of misinformation and so I decided to make a post about it. As usual, you can find the complete project on Github: https://github.com/mtrojahn/springboot-thymeleaf-i18n. Let’s start by the pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.marcelustrojahn</groupId>
    <artifactId>springboot-thymeleaf-i18n</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot-thymeleaf-i18n</name>
    <description>Example on how to implement i18n with Spring Boot and Thymeleaf</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.codehaus.groovy</groupId>
            <artifactId>groovy</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.codehaus.gmavenplus</groupId>
                <artifactId>gmavenplus-plugin</artifactId>
                <version>1.5</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>addSources</goal>
                            <goal>addTestSources</goal>
                            <goal>generateStubs</goal>
                            <goal>compile</goal>
                            <goal>testGenerateStubs</goal>
                            <goal>testCompile</goal>
                            <goal>removeStubs</goal>
                            <goal>removeTestStubs</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<groupId>com.marcelustrojahn</groupId>

<artifactId>springboot-thymeleaf-i18n</artifactId>

<version>1.0-SNAPSHOT</version>

<name>springboot-thymeleaf-i18n</name>

<description>Example on how to implement i18n with Spring Boot and Thymeleaf</description>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

<java.version>1.8</java.version>

</properties>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>1.4.3.RELEASE</version>

</parent>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-thymeleaf</artifactId>

</dependency>

<groupId>org.codehaus.groovy</groupId>

<artifactId>groovy</artifactId>

</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-devtools</artifactId>

</dependency>

</dependencies>

<build>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

<groupId>org.codehaus.gmavenplus</groupId>

<artifactId>gmavenplus-plugin</artifactId>

<goals>

<goal>addSources</goal>

<goal>addTestSources</goal>

<goal>generateStubs</goal>

<goal>compile</goal>

<goal>testGenerateStubs</goal>

<goal>testCompile</goal>

<goal>removeStubs</goal>

<goal>removeTestStubs</goal>

</goals>

</execution>

</executions>

</plugin>

</plugins>

</build>

</project>

Application.groovy

package com.marcelustrojahn.boot

import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.context.annotation.ComponentScan


@SpringBootApplication
@ComponentScan(basePackages = ["com.marcelustrojahn.controllers"])
class Application {

    static void main(String[] args) {
        SpringApplication.run(Application, args)
    }
}

package com.marcelustrojahn.boot

import org.springframework.boot.SpringApplication

import org.springframework.boot.autoconfigure.SpringBootApplication

import org.springframework.context.annotation.ComponentScan

@SpringBootApplication

@ComponentScan(basePackages = ["com.marcelustrojahn.controllers"])

class Application {

static void main(String[] args) {

SpringApplication.run(Application, args)

}

As you can see, Application.groovy is pretty much the default for any Spring Boot application. I only changed @ComponentScan to lookup the package that...

Tutorial

August 23, 2016

Spring Boot / Thymeleaf: Fragments via Ajax

This is probably not the best approach and you guys can feel free to correct me in the comments section, but here is a simple tutorial on how I’m getting my fragments loaded via ajax. Same as before, the full project is on my Github: https://github.com/mtrojahn/spring-thymeleaf-fragments-from-ajax Let’s get to it: MyController.groovy

@Controller
class MyController {

    @GetMapping(['/', '/index.html'])
    def index(Model model) {
        'index'
    }

    @GetMapping('/frag1')
    def frag1(Model model) {
        model.addAttribute("content", "hello")
        "fragments/frag1 :: content"
    }

    @GetMapping('/frag2')
    def frag2(Model model) {
        model.addAttribute("content", "world")
        "fragments/frag2 :: content"
    }
}

@Controller

class MyController {

@GetMapping(['/', '/index.html'])

def index(Model model) {

'index'

}

@GetMapping('/frag1')

def frag1(Model model) {

model.addAttribute("content", "hello")

"fragments/frag1 :: content"

}

@GetMapping('/frag2')

def frag2(Model model) {

model.addAttribute("content", "world")

"fragments/frag2 :: content"

}

Very simple controller. Nothing special except for the fact it’s returning Thymeleaf fragmets from /resources/templates/fragments. As you probably noticed, for the sake of this example, each fragment is recieving it’s “content” from the controller. Here’s a fragment: frag1.html

<th:block th:fragment="content" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
    <div th:text="${content}"></div>
</th:block>

<th:block th:fragment="content" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">

</th:block>

Now the index.html

<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8"/>
    <title>Title</title>

    <script src="webjars/jquery/3.1.0/jquery.js"></script>
</head>
<body>

<button id="bt1">Load Fragment 1</button>
<button id="bt2">Load Fragment 2</button>

<div id="content"></div>

<script>
    /*<![CDATA[*/
    $("#bt1").on("click", function () {
        $("#content").load("/frag1");
    });

    $("#bt2").on("click", function () {
        $("#content").load("/frag2");
    });
    /*]]>*/
</script>
</body>
</html>

<!DOCTYPE html>

<head>

<title>Title</title>

</head>

<body>

<button id="bt1">Load Fragment 1</button>

<button id="bt2">Load Fragment 2</button>

/*<![CDATA[*/

$("#bt1").on("click", function () {

$("#content").load("/frag1");

});

$("#bt2").on("click", function () {

$("#content").load("/frag2");

});

/*]]>*/

</script>

</body>

</html>

Each button has it’s event and is calling...

Tutorial

August 22, 2016

Spring-Boot / Websocket Example

It’s been a while! Project for this post: https://github.com/mtrojahn/spring-boot-websocket Recently I stumbled upon the need of using Websockets. I confess I know little about the subject and I hope this little tutorial can help you to get started. I’m making this post just because I tried to help here on StackOverflow and I thought I should just post it here as well. pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.marcelustrojahn</groupId>
	<artifactId>spring-boot-websocket-example</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>spring-boot-websocket-example</name>
	<description>Simple Websocket Example</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.4.0.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-websocket</artifactId>
		</dependency>
		<dependency>
			<groupId>org.codehaus.groovy</groupId>
			<artifactId>groovy</artifactId>
		</dependency>
		<dependency>
			<groupId>org.webjars</groupId>
			<artifactId>sockjs-client</artifactId>
			<version>1.0.2</version>
		</dependency>
		<dependency>
			<groupId>org.webjars.bower</groupId>
			<artifactId>stomp-websocket</artifactId>
			<version>2.3.4</version>
		</dependency>
		<dependency>
			<groupId>org.webjars</groupId>
			<artifactId>jquery</artifactId>
			<version>3.1.0</version>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.codehaus.gmavenplus</groupId>
				<artifactId>gmavenplus-plugin</artifactId>
				<version>1.5</version>
				<executions>
					<execution>
						<goals>
							<goal>addSources</goal>
							<goal>addTestSources</goal>
							<goal>generateStubs</goal>
							<goal>compile</goal>
							<goal>testGenerateStubs</goal>
							<goal>testCompile</goal>
							<goal>removeStubs</goal>
							<goal>removeTestStubs</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
</project>

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<groupId>com.marcelustrojahn</groupId>

<artifactId>spring-boot-websocket-example</artifactId>

<version>0.0.1-SNAPSHOT</version>

<name>spring-boot-websocket-example</name>

<description>Simple Websocket Example</description>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>1.4.0.RELEASE</version>

</parent>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

<java.version>1.8</java.version>

</properties>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-websocket</artifactId>

</dependency>

<groupId>org.codehaus.groovy</groupId>

<artifactId>groovy</artifactId>

</dependency>

<groupId>org.webjars</groupId>

<artifactId>sockjs-client</artifactId>

</dependency>

<groupId>org.webjars.bower</groupId>

<artifactId>stomp-websocket</artifactId>

</dependency>

<groupId>org.webjars</groupId>

<artifactId>jquery</artifactId>

</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-test</artifactId>

</dependency>

</dependencies>

<build>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

<groupId>org.codehaus.gmavenplus</groupId>

<artifactId>gmavenplus-plugin</artifactId>

<goals>

<goal>addSources</goal>

<goal>addTestSources</goal>

<goal>generateStubs</goal>

<goal>compile</goal>

<goal>testGenerateStubs</goal>

<goal>testCompile</goal>

<goal>removeStubs</goal>

<goal>removeTestStubs</goal>

</goals>

</execution>

</executions>

</plugin>

</plugins>

</build>

</project>

Application.class (nothing special here)

package com.marcelustrojahn

import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication

@SpringBootApplication
class Application {

	static void main(String[] args) {
		SpringApplication.run Application, args
	}
}

package com.marcelustrojahn

import org.springframework.boot.SpringApplication

import org.springframework.boot.autoconfigure.SpringBootApplication

@SpringBootApplication

class Application {

static void main(String[] args) {

SpringApplication.run Application, args

}

WebSocketConfiguration.class

package com.marcelustrojahn

import org.springframework.context.annotation.Configuration
import org.springframework.messaging.simp.config.MessageBrokerRegistry
import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker
import org.springframework.web.socket.config.annotation.StompEndpointRegistry

@Configuration
@EnableWebSocketMessageBroker
class WebSocketConfiguration extends AbstractWebSocketMessageBrokerConfigurer {
    void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/topic")
        config.setApplicationDestinationPrefixes("/app")
    }

    @Override
    void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {
        stompEndpointRegistry.addEndpoint("/websocket").withSockJS()
    }
}

package com.marcelustrojahn

import org.springframework.context.annotation.Configuration

import org.springframework.messaging.simp.config.MessageBrokerRegistry

import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer

import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker

import org.springframework.web.socket.config.annotation.StompEndpointRegistry

@Configuration

@EnableWebSocketMessageBroker

class WebSocketConfiguration extends AbstractWebSocketMessageBrokerConfigurer {

void configureMessageBroker(MessageBrokerRegistry config) {

config.enableSimpleBroker("/topic")

config.setApplicationDestinationPrefixes("/app")

}

@Override

void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {

stompEndpointRegistry.addEndpoint("/websocket").withSockJS()

}

PingPongController.class

package com.marcelustrojahn

import org.springframework.beans.factory.annotation.Autowired
import org.springframework.messaging.handler.annotation.MessageMapping
import org.springframework.messaging.handler.annotation.SendTo
import org.springframework.messaging.simp.SimpMessagingTemplate
import org.springframework.scheduling.annotation.EnableScheduling
import org.springframework.scheduling.annotation.Scheduled
import org.springframework.stereotype.Controller

@Controller
@EnableScheduling
class PingPongController {

    @Autowired
    SimpMessagingTemplate template

    @Scheduled(fixedDelay = 20000L)
    @SendTo("/topic/pingpong")
    def sendPong() {
       template.convertAndSend("/topic/pingpong", "pong (periodic)")
    }

    @MessageMapping("/ping")
    @SendTo("/topic/pingpong")
    def sendPingResponse() {
        "pong (response)"
    }
}

package com.marcelustrojahn

import org.springframework.beans.factory.annotation.Autowired

import org.springframework.messaging.handler.annotation.MessageMapping

import org.springframework.messaging.handler.annotation.SendTo

import org.springframework.messaging.simp.SimpMessagingTemplate

import org.springframework.scheduling.annotation.EnableScheduling

import org.springframework.scheduling.annotation.Scheduled

import org.springframework.stereotype.Controller

@Controller

@EnableScheduling

class PingPongController {

@Autowired

SimpMessagingTemplate template

@Scheduled(fixedDelay = 20000L)

@SendTo("/topic/pingpong")

def sendPong() {

template.convertAndSend("/topic/pingpong", "pong (periodic)")

}

@MessageMapping("/ping")

@SendTo("/topic/pingpong")

def sendPingResponse() {

"pong (response)"

}

This is the main thing. For this example I added a scheduled method that will periodically broadcast a message to all clients and another method that will just...

Tutorial

December 9, 2015

Integrating ZK Framework on a Spring Boot application

The complete project can be found here: https://github.com/mtrojahn/spring-boot-groovy-zk As you already know if you read my previous posts, I kinda decided to shift my focus to Groovy and I’m learning as I go. Feel free to correct me any time on the comments if you feel I’m doing something wrong or not optimal. In this post I’ll show how to integrate the ZK Framework on a Spring-Boot project just to output a “Hello World” message coming from an autowired bean just so we can check if everything is correctly wired. As usual, let’s start with the build.gradle file:

group 'com.mtrojahn'
version '1.0-SNAPSHOT'

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath "org.springframework.boot:spring-boot-gradle-plugin:1.3.0.RELEASE"
    }
}

apply plugin: 'groovy'
apply plugin: 'spring-boot'

repositories {
    mavenCentral()
    maven {
        url "http://mavensync.zkoss.org/maven2"
    }
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

configurations {
    all*.exclude group: 'org.slf4j', module: 'slf4j-jdk14'
}

dependencies {
    compile "org.springframework.boot:spring-boot-starter-web"
    compile "org.zkoss.zk:zkplus:8.0.0"
    compile "org.zkoss.zk:zkbind:8.0.0"
    compile "org.zkoss.zk:zkspring-core:3.0"
    compile 'org.codehaus.groovy:groovy-all'
    testCompile "junit:junit"
}

bootRun {
    addResources = true
}

group 'com.mtrojahn'

version '1.0-SNAPSHOT'

buildscript {

repositories {

mavenCentral()

}

dependencies {

classpath "org.springframework.boot:spring-boot-gradle-plugin:1.3.0.RELEASE"

}

apply plugin: 'groovy'

apply plugin: 'spring-boot'

repositories {

mavenCentral()

maven {

url "http://mavensync.zkoss.org/maven2"

}

sourceCompatibility = 1.8

targetCompatibility = 1.8

configurations {

all*.exclude group: 'org.slf4j', module: 'slf4j-jdk14'

}

dependencies {

compile "org.springframework.boot:spring-boot-starter-web"

compile "org.zkoss.zk:zkplus:8.0.0"

compile "org.zkoss.zk:zkbind:8.0.0"

compile "org.zkoss.zk:zkspring-core:3.0"

compile 'org.codehaus.groovy:groovy-all'

testCompile "junit:junit"

}

bootRun {

addResources = true

}

Ok,...

Tutorial

November 26, 2015

Spring-Boot / Groovy / MVC “Hello World” example

The complete project can be found here: https://github.com/mtrojahn/spring-boot-groovy-mvc-simple This is yet another very basic example. This time I’ll show how to create get a Web-MVC Spring-Boot project started. You will notice I take the no-XML approach and I’ll try to keep my examples as XML-free as they can be because it’s hard to find fresh documentation about it on the Web. So, let me start with the build.gradle file:

group 'com.mtrojahn'
version '1.0-SNAPSHOT'

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath "org.springframework.boot:spring-boot-gradle-plugin:1.3.0.RELEASE"
    }
}

apply plugin: 'groovy'
apply plugin: 'spring-boot'

repositories {
    mavenCentral()
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

dependencies {
    compile "org.springframework.boot:spring-boot-starter-web"
    compile 'org.codehaus.groovy:groovy-all'
    testCompile "junit:junit"
}

bootRun {
    addResources = true
}

group 'com.mtrojahn'

version '1.0-SNAPSHOT'

buildscript {

repositories {

mavenCentral()

}

dependencies {

classpath "org.springframework.boot:spring-boot-gradle-plugin:1.3.0.RELEASE"

}

apply plugin: 'groovy'

apply plugin: 'spring-boot'

repositories {

mavenCentral()

}

sourceCompatibility = 1.8

targetCompatibility = 1.8

dependencies {

compile "org.springframework.boot:spring-boot-starter-web"

compile 'org.codehaus.groovy:groovy-all'

testCompile "junit:junit"

}

bootRun {

addResources = true

}

As you can see, no big changes from my previous example. Basically all you have to do is change spring-boot-starter to spring-boot-starter-web. Ok, now let’s have a look on the...

Tutorial

November 25, 2015

Spring-Boot / Groovy / Gradle “Hello World” application

The complete code for this project can be found here: https://github.com/mtrojahn/spring-boot-groovy-console-app Last weekend I was playing around with Gradle which I have never used before. The result is this very basic spring-boot project just to illustrate how I did it. Gradle isn’t that difficult but I had a few problems until I learn about the spring-boot-gradle-plugin and such. This is the build.gradle:

group 'com.mtrojahn'
version '1.0-SNAPSHOT'

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath "org.springframework.boot:spring-boot-gradle-plugin:1.3.0.RELEASE"
    }
}

apply plugin: 'groovy'
apply plugin: 'spring-boot'

repositories {
    mavenCentral()
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

dependencies {
    compile "org.springframework.boot:spring-boot-starter"
    compile 'org.codehaus.groovy:groovy-all'
    testCompile "junit:junit"
}

bootRun {
    addResources = true
}

group 'com.mtrojahn'

version '1.0-SNAPSHOT'

buildscript {

repositories {

mavenCentral()

}

dependencies {

classpath "org.springframework.boot:spring-boot-gradle-plugin:1.3.0.RELEASE"

}

apply plugin: 'groovy'

apply plugin: 'spring-boot'

repositories {

mavenCentral()

}

sourceCompatibility = 1.8

targetCompatibility = 1.8

dependencies {

compile "org.springframework.boot:spring-boot-starter"

compile 'org.codehaus.groovy:groovy-all'

testCompile "junit:junit"

}

bootRun {

addResources = true

}

As you can see it’s fairly simple and way more organized than Maven in my opinion. The spring-boot-gradle-plugin is the key here. It provides all the version information for the dependencies and also adds a Gradle task...

Tutorial

November 25, 2015

Spring-boot / Maven simple “Hello World” application

The complete code for this application: https://github.com/mtrojahn/spring-boot-console-app In this example I’ll try to show how to create a simple console application to print out the traditional “Hello World” message using spring-boot on a Maven project. I’ll try to keep it as simple as possible for now and I’ll most likely use this code as base for new posts. Let’s start with the pom.xml file.

<!--?xml version="1.0" encoding="UTF-8"?-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelversion>4.0.0</modelversion>

    <groupid>com.mtrojahn</groupid>
    <artifactid>spring-boot-console-app</artifactid>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <properties>
        <project.build.sourceencoding>UTF-8</project.build.sourceencoding>
        <java.version>1.8</java.version>
        <start-class>com.mtrojahn.boot.Application</start-class>
    </properties>

    <parent>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-parent</artifactid>
        <version>1.3.0.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter</artifactid>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupid>org.apache.maven.plugins</groupid>
                <artifactid>maven-compiler-plugin</artifactid>
                <version>3.3</version>
                <configuration>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupid>org.apache.maven.plugins</groupid>
                <artifactid>maven-surefire-plugin</artifactid>
                <version>2.19</version>
                <configuration>
                    <skiptests>true</skiptests>
                </configuration>
            </plugin>
            <plugin>
                <groupid>org.springframework.boot</groupid>
                <artifactid>spring-boot-maven-plugin</artifactid>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

<groupid>com.mtrojahn</groupid>

<artifactid>spring-boot-console-app</artifactid>

<version>1.0-SNAPSHOT</version>

<project.build.sourceencoding>UTF-8</project.build.sourceencoding>

<java.version>1.8</java.version>

<start-class>com.mtrojahn.boot.Application</start-class>

</properties>

<groupid>org.springframework.boot</groupid>

<artifactid>spring-boot-starter-parent</artifactid>

<version>1.3.0.RELEASE</version>

</parent>

<groupid>org.springframework.boot</groupid>

<artifactid>spring-boot-starter</artifactid>

</dependency>

</dependencies>

<build>

<groupid>org.apache.maven.plugins</groupid>

<artifactid>maven-compiler-plugin</artifactid>

</configuration>

</plugin>

<groupid>org.apache.maven.plugins</groupid>

<artifactid>maven-surefire-plugin</artifactid>

</configuration>

</plugin>

<groupid>org.springframework.boot</groupid>

<artifactid>spring-boot-maven-plugin</artifactid>

<goals>

<goal>repackage</goal>

</goals>

</execution>

</executions>

</plugin>

</plugins>

</build>

</project>

This is a simple console application so, for now, we only need “spring-boot-starter” as dependency. You can also notice that I included a few plugins. The most important for now is the spring-boot-maven-plugin which will...

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