Apex Code Development You need to sign in to do that
Don't have an account?
Kaity webservice' keyword in trigger
Hi,
My understanding was, we can not use 'webservice' keyword in trigger. However, I saw in apex guide, we can use 'webservice' key word.
You can only use the webService keyword in a trigger when it is in a method defined as asynchronous; that is, when the
method is defined with the @future keyword.
Can someone clear me this idea? How to write a code here, any example..
Thank you.
From the docs:
---
You cannot use the webService keyword in a trigger because you cannot define a method in a trigger.
---
It looks like the original documentation was referring to callouts rather than webservice methods, as you can only execute callout methods marked as @future so that the transaction isn't delayed waiting for a response.
Callouts cannot be made from triggers as that would hold up the database transaction until the callout completed, which can be up to 120 seconds from a limits perspective. The way to solve that is to make the callout in a future method which is separate from the transaction and hence ansynchronous.
A webservice method can be called from a trigger as you see in this post (http://salesforce.stackexchange.com/questions/45520/calling-webservices-in-apex-trigger) on Stackexchange but this is not a callout and maybe the docs need to be updated as the replier says.
// Niklas
In this context, I am currently reading - Force.com Apex Code Developer's Guide; Version 32.0, Winter ’15. Please see page 198.
Thanks,
Kaity
Agree. The documentation is totally wrong.
I have just tried to create webservice method inside a trigger.
When we try to create a method within trigger, we obtain error:
Error: Compile Error: Webservice methods must be contained in a global class at line 2 column 32
If we try to add "global" token before "trigger" we will get
Error: Compile Error: unexpected token: global at line 1 column 0
However, to my great surprise, you can actually add methods to trigger!
Anyway, even if you to write code like this
trigger co on CO__c (after undelete) {
@future
static void met() {
public webservice String x {get; set;}
}
met();
}
You will get an error saying:
Error: Compile Error: Variables cannot be marked as web services at line 4 column 39
So, actually you can define methods inside a class, despite how weird it sounds, but you still cannot use webservice keyword inside a trigger no matter what.