Policy Server Guides › Policy Server Configuration Guide › Attributes and Expressions Reference › Functions Available within Expressions › THROW Function--Stop Processing and Report Custom Error

THROW Function--Stop Processing and Report Custom Error

You can write an expression that tests for an error and if an error has occurred, calls THROW, passing a custom error message. When the expression evaluator encounters THROW, it stops processing the expression and outputs the custom error message to the console log.

Syntax

The THROW function has the following format:

THROW(error_message)

Parameters

The THROW function accepts the following parameter:

error_message (string)

Specifies the custom error message that is output to the console log.

Return Value

The THROW function does not return.

Example

EXISTS('MyFile') ? #Process('MyFile') : THROW('File does not exist.')
Message Output to the Console Log: 'File does not exist.'

VEXIST(#Sortname) ? #Sortname : THROW('Sortname is not defined.')
Message Output to the Console Log: 'Sortname is not defined.'