Webservice Keyword Limitations

B.

In Apex, the webservice keyword is used to declare a method as a web service. This means that the method can be called remotely by external systems using SOAP or REST protocols. However, there are certain restrictions on where the webservice keyword can be used.

The webservice keyword is not allowed to be used in triggers. Triggers are a type of Apex code that are executed before or after specific events occur, such as inserting, updating, or deleting records. Triggers are associated with a specific object and are executed in the context of the transaction that caused the trigger to fire. Because web service calls can potentially introduce additional transactions, using the webservice keyword in a trigger could result in unpredictable behavior.

In addition to triggers, the webservice keyword is also not allowed to be used in classes that implement certain Salesforce interfaces, such as Queueable or Schedulable. These interfaces are used to implement asynchronous processing in Salesforce, such as executing long-running tasks or scheduling tasks to run at a future time. Again, using the webservice keyword in these classes could result in unpredictable behavior, because web service calls could potentially interfere with the asynchronous processing.

In summary, the webservice keyword is not allowed to be used in triggers, classes that implement certain Salesforce interfaces, or any code that could potentially interfere with the normal processing of a transaction.