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This blog describes how to create a Custom web service in Salesforce using Apex. Steps:   Navigate to  Setup>Develop>Apex Classes   and create new class by clicking new button. Write a class with " global " access modifier with methods (to be exposed) with " webService " keyword         eg. global class KartikService {     webService static String hello(String Name)     {         return 'Hello ' +Name+ ' ! :D' ;     } } Then save this class. After saving the class you will view a button " Generate WSDL ". Click on that to get WSDL for web service you just created. Save the WSDL file. Let say file name is " KartikService.wsdl " Now we will consider how we generate clients to call this service in Java and in .Net.   For Java: We will create new project in Eclipse with name "ApexCustomWS" You need  Enterprise / Partner WSDL  to access your Salesforce org. by getting a valid sessionId

I agree that Salesforce Developer DEV-401 exam is easier than Salesforce Administrator ADM-201. I recommend taking the Salesforce Administrator ADM-201 first, although this is no longer a pre-requisite to the Salesforce Developer DEV-401 it gives Salesforce professionals a good grounding. Resources To Pass Salesforce Developer Exam (DEV-401): Salesforce Developer Study Guide  (PDF) Force.com Platform Fundamentals  ( Free) Premier training -  Building Applications with Force.com and Visualforce (DEV401) Tip Sheets and Implementation Guides  (Salesforce Help - Free) Workshop: Get Started on the Certified Force.com Developer Credential  (Dreamforce video) Specific Areas To Focus On : Master-detail relationships Sharing rules and Org Wide Defaults Assignment rules Approval processes Junction Objects Workflows Custom report types Analytic snapshots Validation rules Field level security Record types Role hierarchy Relationship rules Master-Detail Rel