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Given the following code:

global class MyBatch implements Database.Batchable<SObject> { global MyBatch() {} global void execute(Database.BatchableContext BC, List<MyBatch Field__c> batch) { } global void finish(Database.BatchableContext BC) {} }

What does this error Message mean?

MyBatch: Class must implement the global interface method: Iterable<SObject> start(Database.BatchableContext) from Database.Batchable<SObject>

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It means that you're missing a particular method; the interface is trying to enforce the implementation of this class.

So adding this method to the MyBatch class will resolve the issue:

 global Database.Querylocator start (Database.BatchableContext BC) { return Database.getQueryLocator(query); }
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    n.b. Unless you are doing managed packages, you can use public rather than global as access modifier throughout your batch class Commented May 20, 2015 at 22:25
  • @crop1645 That's good to know. Thank you! Commented May 21, 2015 at 2:49
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    yep - I learned it from @sfdcfox who knows everything Commented May 22, 2015 at 9:17
  • You can write a batch in a managed package that uses public rather than global too. Global is only needed to expose the class or method to code outside the package. Commented Mar 8, 2019 at 0:27

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