Liferay Service Hook to override Liferay Existing Service

Today we will see how to write service wrapper in Liferay 6.2. We override User service getUserCount().Here we create a class that extend the particular wrapper class and just provide the entries of our custom class in liferay-hook.xml so that liferay use our services instead of Original.

Step 1:-Create a liferay Plug project
Right Click in Project Explorer and Click New -> Liferay plugin project. Now give the Project name and select hook in plugin type:-

Step 2:-Create a hook in the project

Right Click on Project ->New->Liferay Hook Configuration->Select Services

Click Next--->Click Add-->Select Service Type(UserLocalService)

For Impl Class

Click New-->Give Package Name and your Impl Class Name

Then Click Finish

This step automatically Create the entry in  liferay-hook.xml. 

<hook>

<service>

<service-type>com.liferay.portal.service.UserLocalService</service-type>

<service-impl>com.ipg.MyUserLocalService</service-impl>

</service>

</hook>

Step 3:-Override the getUserCount()

Open MyUserLocalService and override getUserCount()

	package com.ipg;
	import com.liferay.portal.kernel.exception.SystemException;
	import com.liferay.portal.service.UserLocalServiceWrapper;
	import com.liferay.portal.service.UserLocalService;
	public class MyUserLocalService extends UserLocalServiceWrapper {
	public MyUserLocalService(UserLocalService userLocalService) {
	super(userLocalService);
	}
	@Override
	public int getUsersCount() throws SystemException {
	System.out.println("This text is from getUsersCount ");
	return super.getUsersCount();
	}
	}

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Step 4:-Deploy the Hook
Deploy the hook and call getUsersCount() from your portlet .

	public void doView(RenderRequest renderRequest,
	RenderResponse renderResponse) throws IOException, PortletException {
	try {
	UserLocalServiceUtil.getUsersCount();
	} catch (SystemException e) {
	e.printStackTrace();
	}
	super.doView(renderRequest, renderResponse);
	}

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Output:-This text is from getUsersCount