Monthly Archives: April 2014

Load inheritance tree into List with Spring



I noticed interesting Spring feature. One of my colleagues used it for loading whole inheritance tree of Spring beans into list. Missed that when I was studying Spring docs.

Let’s have this inheritance tree of Spring beans:


Not let’s load inheritance tree of beans into list with constructor injection:

public class Nature {
	List<Animal> animals;

	public Nature(List<Animal> animals) {
		this.animals = animals;

	public void showAnimals() {
		animals.forEach(animal -> System.out.println(animal));

Method showAnimals is using Java 8 lambda expression to output loaded beans into console. You would find a lot of reading about this new Java 8 feature these days.

Spring context is loaded by this main class:

public class Main {
	public static void main(String[] args) {
		AnnotationConfigApplicationContext context =
				new AnnotationConfigApplicationContext(SpringContext.class);

		Nature nature = context.getBean(Nature.class);

Console output:

PolarBear []
Wolf []
Animal []
Grizzly []
Bear []

This feature can be handy sometimes. Source code of this short example is on Github.


Eclipse Kepler + Java 8: Syntax error, annotations are only available if source level is 1.5 or greater



When I configured project with Spring, Maven and Java 8, my Eclipse showed a lot of errors. I noticed mostly refusing to accept annotations:

Syntax error, annotations are only available if source level is 1.5 or greater.

Eclipse Kepler doesn’t have built in support for JDK8. So there is needed to install JDT with Java8 support.

I use Spring Tools Suite 3.5.0.RELEASE, which  is still based on Eclipse Kepler (4.3.2). That is why STS needs this update.


Measuring code coverage by Protractor end-to-end tests



Was just setting up new JavaScript project based on Grunt. I scaffolded the project template by Yeoman with usage of angular-fullstack generator. I decided to try MEAN stack without MongoDB for my new project (DB isn’t needed).

Next step was integrating Require.JS and configuring measurement of code coverage on client and server by Instanbul. When was this all done I was wondering if it is possible to measure code coverage by Protractor end-to-end testing.

After quick search I found that Ryan Bridges recently released grunt-protractor-coverage plugin. Interesting coincidence. So I decided to try it and can confirm that it’s working fine with mentioned stack. Configuration was smooth and Ryan fixed small issue very promptly. It’s based on grunt-protractor-runner plugin.

I created separate Grunt configuration file just for this purpose not to mess around with normal build. I had also problems to run ‘makeReport’ task of grunt-istanbul plugin for two different directories (Mocha server side code coverage measurement is using same task).

So here is the Grunt flow. First we need to copy non JavaScript files into target directory. It needs to be in separate directory because JavaScript files will need to be instrumented.

copy: {
  coverageE2E: {
    files: [{
      expand: true,
      dot: true,
      cwd: '<%= %>',
      dest: '<%= dirs.instrumentedE2E %>/app',
      src: [

Next step is instrumentation of the code. It is needed for gathering coverage stats. Each line is decorated by special instructions that helps during measurement. Pay attention to fact that we are instrumenting server and client side code. Instrumented code is placed into target directory represented by placeholder <%= dirs.instrumentedE2E %>.

instrument: {
  files: ['server/**/*.js', 'app/scripts/**/*.js'],
  options: {
    lazy: true,
    basePath: '<%= dirs.instrumentedE2E %>/'

Next we start Express from target directory.

express: {
  options: {
    port: process.env.PORT || 9000
  coverageE2E: {
    options: {
      script: '<%= dirs.instrumentedE2E %>/lib/server.js',
      debug: true

And the protractor_coverage task of grunt-protractor-coverage plugin. Configuration should be the same as for grunt-protractor-runner plugin.

protractor_coverage: {
  options: {
    configFile: 'test/protractor/protractorConf.js', // Default config file
    keepAlive: true, // If false, the grunt process stops when the test fails.
    noColor: false, // If true, protractor will not use colors in its output.
    coverageDir: '<%= dirs.instrumentedE2E %>',
    args: {}
  chrome: {
    options: {
      args: {
        baseUrl: 'https://localhost:3000/',
        // Arguments passed to the command
        'browser': 'chrome'

Last step is generation  of coverage report.

makeReport: {
  src: '<%= dirs.instrumentedE2E %>/*.json',
  options: {
    type: 'html',
    dir: '<%= dirs.coverageE2E %>/reports',
    print: 'detail'

Finally, this is grunt task gathering all steps.

grunt.registerTask('default', [

EDIT: Notice that following Github link was changed to branch, because project structure was significantly changed:

Source code for this project can be found on GitHub.

For running end to end Protractor test you have to have webdriver-manager running. See  Protractor documentation.

To install and start Selenium Webdriver:

npm install -g protractor
webdriver-manager update
webdriver-manager start

To install project dependencies:

npm install
bower install

To run this end-to-end testing with coverage measurement (webdriver-manager has to be running):

grunt --gruntfile Gruntfile-e2e.js