Liferay Hook Interview Questions

• What is Hook plugins in Liferay?
  • Liferay Hooks are used to override core functionality of liferay services, web resources, language properties, filters, indexers, structs actions etc  and below are list of Hooks available in Liferay 6.2 below versions.   Liferay DXP will not use any HOOK at all and it uses OSGI platform to override the Liferay core functionality.Access tutorial for complete details:
    • Liferay Hooks
• What are all configuration can be overridden using Hooks?
  • Web resource (JSP, JS, images) Hooks
  • Service wrapper Hooks
  • Portal Properties
    • Portal Events
      • application.startup.events
      • login.events.post
      • login.events.pre
      • logout.events.post
      • logout.events.pre
      • servlet.service.events.post
      • servlet.service.events.pre
      • servlet.session.create.events
      • servlet.session.destroy.events
    • Portal Properties
      • 
  • Struts Action
  • Servlet Filters
  • Auth Pipeline
  • Modal Listeners
  • Indexers
  • Language Hook
• What is your preference in EXT and HOOK?
  • Liferay Hooks are hot deployable, but EXT’s are not. so always prefer Hooks over EXT’s to override core functionality.
  • EXT should be used when it is not feasible through HOOK configuration
• Explain how do you override liferay login.jsp?
  • We will create JSP Hook for this, so create hook plugin
  • Create custom_jsps in docroot like :     docroot/custom_jsps 
  • edit liferay-hook.xml and add below tag:
    • <custom-jsp-dir>/custom_jsps</custom-jsp-dir>
  • copy the login.jsp from html path like : html/portlet/login/login.jsp
• Explain how does liferay loads hooked JSP?
  •  Liferay just copies login.jsp from hook plugin to  to liferay html folder and moves original html to login.portal.jsp,which is original file.
  • When we un deploy, liferay just deletes login.jsp and reverts login.portal.jsp file again.
• Suppose you have created two hook plugins for login.jsp? which one will take effect?
  • Both Hook plugin will deploy and you will not get any error. Liferay uses JSP from which it deployed latest order.
• What is importance of custom-jsp-global tag in liferay hook?  or (What is Application Adapters in Liferay and how to create them)?
  • Application Adapters are Hook Plugins  will allow us to scope the Hook changes to a particular  site by not affecting the entire portal.
  • How to create Application Adapter?
    • To create a Application Adapter, all you need is a Hook with custom JSPs and “custom-jsp-global” set to false

    • <hook>  <custom-jsp-dir>/custom_jsps</custom-jsp-dir>  <custom-jsp-global>false</custom-jsp-global> </hook>

  • When custom-jsp-global set to “true” then the hook is applied to all sites .
  • When custom-jsp-global set it to false  then we have the option of configuring which sites that hook will apply. Go to the Control Panel > Sites > Test Site > Configuration > Site Settings and  at bottom of page, you will find a Configuration section with Application Adapters and a drop down. There you can set the hook you want to apply to the site
• How you can change the existing implementation of indexing of Liferay Core service ?
  • Using Indexer Post Processor hook
• Is it possible to add new method in service through service wrapper hook?
  • No. Even you write methods then those will not accessible
• can we add new struts actions using Hooks?
  • Yes, We can create new struts actions

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