How to transform Play project as Eclipse project

To transform a new Play project into Eclipse workspace.
the following steps can be followed.

1. navigate into the play project root directory. eg. C:\my-play-project

2. add the following plugin into the end of project/plugins.sbt

addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "5.2.2")

3. add the following configuration into the end of build.sbt

EclipseKeys.preTasks := Seq(compile in Compile, compile in Test)
EclipseKeys.projectFlavor := EclipseProjectFlavor.Java  
EclipseKeys.createSrc := EclipseCreateSrc.ValueSet(EclipseCreateSrc.ManagedClasses, EclipseCreateSrc.ManagedResources) 

How to create new Play Java project

1. make sure sbt is installed in your OS
2. create a new folder, eg. "my-play-project"
3. open command prompt, and navigate to the newly create folder
4. in the command prompt, type "sbt new playframework/play-java-seed.g8"
  a) enter project name
  b) enter organization
  c) enter scala version
  d) enter play version
  e) enter sbt version

How to easily get logged in user in Liferay.

ServiceContextThreadLocal.getServiceContext().getUserId();


reference:
http://liferay-hacks.blogspot.my/2014/01/get-current-logged-in-user-easily-in.html

How to delay Quartz Scheduler startup in a web application

Quartz scheduler startup can be delayed by configuration in web.xml or programmatically.

1. Configuration in web.xml

<context-param>

<param-name>quartz:start-delay-seconds</param-name>

<param-value>DELAY_IN_SECONDS</param-value>

</context-param>

2. Programmatically

    scheduler.startDelayed(DELAY_IN_SECONDS);

Done!!

How to create angular 4 module

This tutorial assuming all prerequisite to start an Angular 4 application has been properly setup with Angular cli.

To create angular 4 module, follow the steps below.
1. navigate to the root directory of your Angular 4 application.

2. run the following command to generate a new module class

    ng generate module moduleName

    eg. ng generate module ferrari

3. run the following command to generate a new component under the above module

    ng generate component moduleName/componentName

    eg. ng generate component ferrari/ferrari-list

4. create a routing class in the same directory with module class  

    eg. ferrari-routing.module.ts