[4.x] Undesirable exception: io.helidon.http.RequestException: No entity

[hrstoyanov]

This is a continuation from the discussion of #8710

The below code can fail :

ServerRequest req = ...;
var params = eq.content().as(Parameters.class);

io.helidon.http.RequestException: No entity
	at io.helidon.http@4.0.8/io.helidon.http.RequestException$Builder.build(RequestException.java:139)
	at io.helidon.webserver@4.0.8/io.helidon.webserver.http.ErrorHandlers.unhandledError(ErrorHandlers.java:203)
	at io.helidon.webserver@4.0.8/io.helidon.webserver.http.ErrorHandlers.lambda$handleError$1(ErrorHandlers.java:182)

Can we make sure it does not, so devs can write clean functional fluent code? Can we return a Parameters "null object" that will have no params ? See discussion for issue #8710

Environment Details

• Helidon Version: 4.0.9
• Helidon SE
• JDK version: 22.0.1
• OS: MacOs 14.5
• Docker version (if applicable):

[tomas-langer]

Would this resolve your issue:

Optional<Parameterse> params = eq.content().asOptional(Parameters.class);

Solve your problem? You could then use functional style to resolve the case when the optional is empty (which would be if there is no entity).

[hrstoyanov]

@tomas-langer - works for me!