Event handler signature mismatch (EventHandlerInvalidSignature)

Type	Scope	Severity	Activated by default	Minutes to fix	Tags
Error	BSL OS	Major	Yes	5	suspicious standard

Description

The signature of a platform-event handler method does not match the event contract: parameter count diverges. If the platform invokes the handler with N parameters but fewer are declared, the runtime either errors out or silently drops the parameter.

The contract is taken from the platform syntax helper (via bsl-context). All overloads of the event signature are considered; the diagnostic fires only if none of them fits.

Examples

// Fires: OnWrite requires Cancel parameter at least; empty signature does not fit.
Procedure OnWrite()
    // ...
EndProcedure

// Does not fire:
Procedure OnWrite(Cancel)
    // ...
EndProcedure

Sources

• Source: BSL coding standards. Module structure

Snippets

Diagnostic ignorance in code

// BSLLS:EventHandlerInvalidSignature-off
// BSLLS:EventHandlerInvalidSignature-on

Parameter for config

"EventHandlerInvalidSignature": false