How to exclude some duplicate dependencies in Grails

Some libraries have duplicate dependencies.
If you want prevent errors and warnings you should exclude duplicates from one of library:

compile (‘org.docx4j:docx4j-ImportXHTML:3.2.1’) { exclude “slf4j-log4j12” }

Spring Boot Build Command Line App


Create Gradle Spring Boot project with SPRING INITIALIZR

I chose Groovy language for the project, but if you want Java, text below with little changes also helps you.

Edit build.gradle and add to it bootRun section

buildscript {
	ext {
		springBootVersion = '1.3.1.RELEASE'
	repositories {
	dependencies {

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

jar {
	baseName = 'myapp'
	version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
targetCompatibility = 1.8

repositories {

dependencies {

task wrapper(type: Wrapper) {
	gradleVersion = '2.9'

// this code split parameters and allow us use parameters in our application
bootRun {
	if ( project.hasProperty('args') ) {
		args project.args.split('\\s+')

create MyController class

class MyController implements CommandLineRunner {

	private Logger logger = LoggerFactory.getLogger(this.getClass())

	void run(String... args) throws Exception {
		if(!args) {
			logger.warn("You must pass at least one parametr.")
			logger.warn("Example: bootRun -Pargs=\"arg1 arg2 arg3\"") 
		// print parameters which we sent from command line
		args.each{ arg ->

Run application
gradle bootRun -Pargs=”arg1 arg2 arg3″

MongoDb and Groovy on Grails

First off all you could find out some plugins

But if you need you could use another method:

1. Edit BuildConfig.groovy
add string like this: compile ‘org.mongodb:mongo-java-driver:3.0.3’ to dependencies section

dependencies {
	compile 'org.mongodb:mongo-java-driver:3.0.3'

2. Edit Config.groovy

mongodb.uri = "mongodb://username:password@your.mongodb.server/yourDataBaseName"
mongodb.database = "yourDataBaseName"

3. Add to resources.groovy

beans = {
	mongoClientURI(MongoClientURI) { bean ->
		bean.constructorArgs = [grailsApplication.config.mongodb.uri.toString()]
	mongoClient(MongoClient) { bean ->
		bean.constructorArgs = [ref(mongoClientURI)]
		bean.destroyMethod = 'close'
	mongoDb(mongoClient: 'getDB') { bean ->
		bean.constructorArgs = [grailsApplication.config.mongodb.database.toString()]

4. Add to any controller (in my case MyController)

package mypackage

import com.mongodb.DB

class MyController {

	DB mongoDb

	def users() {

		def collection = mongoDb.getCollection('myCollection')

		collection.insert(new BasicDBObject(['name':'Piter']))
		def users = collection.find(new BasicDBObject(['name':'Piter'])).toArray()
		render (contentType: 'application/json', text: JSON.serialize(users))

	def user() {

		def userId = params.userId
		def collection = mongoDb.getCollection('myCollection')
		def user = collection.findOne(new BasicDBObject(['_id': new ObjectId(userId)]))
		render (contentType: 'application/json', text: JSON.serialize(user))


Java Compare Strings Depends On Locale

For correct sorting of strings in Ukrainian or any other language, you must explicitly specify the locale Locale. To solve this problem, we use the class from the package java.text – Collator.

ArrayList<String> countries = new ArrayList<String>();

System.out.println("Before sort:");


System.out.println("After regular sort:");



Locale ukrainian = new Locale("uk", "UA");

Collator ukrainianCollator = Collator.getInstance(ukrainian);

Collections.sort(countries, ukrainianCollator);

System.out.println("After locale sort:");



Before sort:
[Єгипет, Туреччина, Ісландія, Аргентина]
After regular sort:
[Єгипет, Ісландія, Аргентина, Туреччина]
After locale sort:
[Аргентина, Єгипет, Ісландія, Туреччина]

Include to Grails gsp view to javascript variable other gsp view content

I have some view (“basicView.gsp”) and want to pass other view content (“_someTemplate.gsp”) to this view to javascript variable (“template”).


var template = '${raw(include(view:"myTemplates/_someTemplate.gsp").replaceAll('\n',''))}';


<h1>Some header</h1>
<p>Lorem ipsum dolor sit...</p>

Resulted html:

var template = '<div><h1>Some header</h1><p>Lorem ipsum dolor sit...</p></div>';

Create Grails + Vaadin project


  • java 1.7.0_25
  • grails 2.4.5
  • vaadin plugin 7.5.2

Create Grails app in ItelliJ IDEA 14 as in this manual –
But use only 1. and 2. points.

After 2. point use next suggestions:

add to BuildConfig.groovy:
to dependencies – runtime ‘org.hibernate:hibernate-validator:5.1.1.Final’
to plugings – compile “:vaadin:7.5.2”
click Apply Grails changes to IDEA project structure

run – grails vaadin-quickstart

Next couple steps:

Screenshot 2015-08-26 23.25.28

Screenshot 2015-08-26 23.29.08

press “+” and select Grails:

Screenshot 2015-08-26 23.30.51

Screenshot 2015-08-26 23.30.51(2)

Screenshot 2015-08-26 23.30.52

select “your app” in Module:

Screenshot 2015-08-26 23.30.52(2)

change name on “your app name”:

Screenshot 2015-08-26 23.30.52(3)


Screenshot 2015-08-26 23.30.52(4)

Thats all.

Maps in Groovy

def someMap = [
           'tablets':['Galaxy Tab','iPad','Asus'],

someMap.eachWithIndex{ k, v, index -> println "${k}:${v} - ${index}" }

phones:[iPhone, Galaxy, Nexus] – 0
laptops:[HP, MacBook, Samsung] – 1
tablets:[Galaxy Tab, iPad, Asus] – 2

def map = [a:"cc", b: "dd"]
println "map - " + map
println "map.keySet() - " + map.keySet()
println "map.values() - " + map.values()
println "map.entrySet() - " + map.entrySet()
println "map.entrySet().key - " + map.entrySet().key
println "map.entrySet().value - " + map.entrySet().value

map – [a:cc, b:dd]
map.keySet() – [a, b]
map.values() – [cc, dd]
map.entrySet() – [a=cc, b=dd]
map.entrySet().key – [a, b]
map.entrySet().value – [cc, dd]

Debian: setup pptp server with ufw firewall

apt-get install pptpd 

nano /etc/pptpd.conf 

nano /etc/ppp/chap-secrets 
username pptpd password * 

nano /etc/ppp/pptpd-options 

service pptpd restart

netstat -alpn | grep :1723

nano /etc/sysctl.conf
net.ipv4.ip_forward = 1

sysctl -p

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE && iptables-save
iptables --table nat --append POSTROUTING --out-interface ppp0 -j MASQUERADE
iptables -I INPUT -s -i ppp0 -j ACCEPT
iptables --append FORWARD --in-interface eth0 -j ACCEPT

# ======================== ufw ===================

ufw allow 22 
ufw allow 1723 

nano /etc/ufw/before.rules 
# NAT table rules 
# Allow forward traffic to eth0 
# Process the NAT table rules 

# before the line # drop INVALID packets ... add: 
-A ufw-before-input -p 47 -j ACCEPT 

ufw disable 
ufw enable

Restoring a MacBook Pro 13″ (mid 2010) after an unsuccessful update SMC 1.6

Nothing boded trouble, OS X notified me about system updates. Apple has recommended updating the SMC to address potential battery issues in the future, here is a link to this update Installing the update failed, the system rebooted, and as a result, my Mac started making noise like a helicopter cooler, after which it was necessary to install the same update again. After rebooting, I saw the icon: wrongsystem

later I found out that this means this system cannot be loaded on your device.
After this incident, an unimaginable number of experiments were carried out, as well as visits to several authorized Apple centers in Kyiv, a series of calls to the Apple representative office in Moscow (since there is no such representative office in Ukraine, there is only an official distributor). The result turned out to be disappointing: the service center offered to replace the motherboard under the exchange program, the amount was about $500. Naturally, I did not spend such money to restore the device of 2010 release …
The most interesting thing that I managed to put on Mac Os X 10.6.8 and it even loaded, and I could see the desktop and controls, but it lasted no more than 2-3 seconds, after which the device went to sleep, after pressing any buttons, the system was activated again, but the screen backlight did not turn on, consider that either it was possible only in bright light, after 2-3 seconds the Mac fell asleep again … Having taken a screenshot from “About this Mac”-> “System Report” I I saw that the above update somehow miraculously flashed my SMC device for MacBook Pro (13-inch, Early 2011) this can be seen in the screenshot, judging by Apple AboutThisMac

The MacBook was “solemnly” put on the shelf until better times or for sale for parts.
A few months later, it was decided to sell the semi-working device. I took a picture of the device and finally with a friend decided to torment him again. A friend found an adapter to DVI and we connected the Mac to an external monitor, to our surprise it worked, but the native screen was not active, and the cooler also worked without turning off. Since we got the opportunity to manipulate the device indefinitely, we armed ourselves with Google and carried out a series of successful actions, as it turned out later.

So the recipe:

  • you need to download the “unfortunate” update MacBookProSMCUpdate1.6.dmg
  • connect the image and unpack MacBookProSMCUpdate1.6.pkg using the unpacker, inside we will see two updates: for MacBook Pro (13-inch, Mid 2010) and for MacBook Pro (13- inch, Early 2011)
    We are interested in the MacBookProSMCUpdate/MacBookProSMCUpdate/System/Library/CoreServices/Firmware Updates/2010MacBookPro13SMC16 folder and 2 files 2010MBP13.smc and SmcFlasher.efi respectively. We put these files in any folder (I put them closer to the root, later we will need them from the console)
  • The next step is to download and install boot menu rEFIt Here everything is according to the instructions from the developers.
    When you reboot the system, you should see the menu from rEFIt – select shell.efi
    A console-like shell will load.rEFIt
  • We write in the line fs1: and press Enter, now you are in your HDD partition and you can go to the folder with pre-prepared files 2010MBP13.smc and SmcFlasher.efi. Then we write SmcFlasher.efi -reset 1 on the command line and press Enter then write SmcFlasher.efi -force -LoadApp 2010MBP15.smc -norestart and press Enter againAfter the manipulations, my cooler stopped making noise. I turned my MacBook off and on again, and to my sincere surprise, the device worked! I am writing this post from him.
    P.S. I would like to warn potential experimenters – everything that you do, you will do on your own responsibility without any guarantees! In any case, good luck to the curious.