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How to display error message at the top of page in Salesforce from Apex? (I'm not using Visualforce)

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You can display error messages using the addError method on sobject or its fields.

Salesforce docs on the sobject instance addError method: http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_System_SObject_addError.htm

More info on exception handling: http://wiki.developerforce.com/page/An_Introduction_to_Exception_Handling

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Thank you for your answer. addError works, however it appends "Error: Invalid Data. Review all error messages below to correct your data." before the error message. Any ideas how to disable that? –  justasd Feb 10 at 15:58
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Other ways you could go about it are to call addError on a specific field like Account.Name.addError(''). This would give you a different, but smaller prefix to the error. Additionally, you could write a validation rule on the sobject to show an error instead of handling it in Apex. This would show a Validation error instead of Invalid data. If none of those suffice, the only other route is more customization through either Visualforce or Javascript. –  James Loghry Feb 10 at 16:46
    
I think using Visualforce would be too much for this scenario. Then I would need to add a page and a controller. I am searching the web how to call JavaScript from Apex class but couldn't find the solution. Is it even possible? (Regular Apex class, not controller) –  justasd Feb 10 at 17:50
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