Hi all,

We need to implement the following pattern at my org:

• callout to external data source
• if that callout takes too long (according to some configurable threshold), log an error (ie do some DML)
• if that callout timed out on the remote server, try it again

Recognizing the potential for the dreaded "You have uncommitted work pending. Please commit or rollback before calling out." error, I put the error logging code in a future method, thus isolating the DML from the callouts. However, the error is still being thrown. I reduced the issue down to this pattern:

public static void foo() {
    Http http = new Http();
    HttpRequest req = new Httprequest();
    req.setEndpoint('https://test.salesforce.com'); //whatever endpoint
    req.setMethod('GET');
    http.send(req); //works fine
    bar();
    http.send(req); //throws calloutexception
}

@future public static void bar() {

}

Am I correct to assume that calling a future method counts as a DML operation? Is there any documentation I'm missing somewhere?

 

I am creating a form in Visualforce. Since my form is a bit long, it is hard for users to remember the error message at the top and revise it. On top of the error message, I want to create a validation when users typing in their information.
For example, there are 2 field, users name and email. Users cannot leave the name field blank, if so, I want to show a message of "This field is required to fill in" beside the field. And for email field, I want to have another message to remind users to insert a valid email.
Is there anyway in visualforce to do so? Thanks for your help.