Creating Practice Application (hello world)

Written by: Pranay Pandey with feedback and contributions from Chirag Manocha, Ravindra Mandre, Rob Schapper
 Special thanks to Mridul Pathak for inspiring me to write this tutorial. 

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First we will be writing services for Party then while writing services for creating Person we will be calling the service for party.
Step - 1 :Create a file by name "services.xml" in servicedef directory.
Step - 2 : Define services for CRUD operations for Party entity. Name of services will be createPracticeParty, updatePracticeParty, deletePracticeParty and specify the correct location to the file where these services will be implemented like /framework/example/script/org/ofbiz/example/example/ExampleServices.xml.
Step - 3 : Create directory structure and PracticeServices.xml file in your component directory for giving the implementation of these services.
(For implementation take reference from serviceservices.xml and ExampleServices.xml files of Example component)
Note : Do not use the <override> tag as it is introduced later in the tutorial. 
From this place if you want to run these services then you can run them by webtools--> Run Service . By this place you can test your services.
Note: At this place you must read http://www.nabble.com/The-fancy-new-entity-auto-service-execution-engine-td18674040.html. This feature has been recently added against the traditional approach of writing CRUD operations for an entity.
This new feature enables you to just define the services by mentioning the operation you want to perform.Basically just set the engine attribute to "entity-auto" and the invoke attribute to "create", "update", or "delete".
like you can take a look in the following code from services.xml of example component:  

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