Allow for Configuration of Jackson StreamReadConstraints

[jjathman]

Feature description

With Jackson 2.15 a new StreamReadConstraints was added which limit the maximum size of certain primitive JSON values. In our application we sometimes receive a String within a JSON message which exceeds the default maximum string length now. Having easy configuration of these stream read constraints would be very helpful for us.

Right now, I think the only way to use something other than the default values is to implement a method like this to override the default JsonFactory created by Micronaut:

    @Primary
    @Requires(beans = JacksonConfiguration.class)
    @Singleton
    @BootstrapContextCompatible
    public JsonFactory jsonFactory(JacksonConfiguration jacksonConfiguration) {
        final TSFBuilder<?, ?> jsonFactoryBuilder = JsonFactory.builder();
        StreamReadConstraints streamReadConstraints = StreamReadConstraints.builder()
                .maxStringLength(20 * 1024 * 1024).build()
        jsonFactoryBuilder.streamReadConstraints(streamReadConstraints)
        jacksonConfiguration.getFactorySettings().forEach(jsonFactoryBuilder::configure);
        return jsonFactoryBuilder.build();
    }

[jjathman]

Note, the default was changed in a subsequent patch release which does fix the immediate problem for us, but I still think this would be nice to make configurable. FasterXML/jackson-core#1014

[yawkat]

note that the micronaut-serialization constraints are already configurable through micronaut.serde.maximum-nesting-depth

(doesn't help when you're using jackson-databind ofc)

[ledigiacomo]

@jjathman is FasterXML/jackson-core#1019 which was made available in version 2.15.2 what you were looking for?

[jjathman]

@ledigiacomo I don't think that setting is configurable is using Micronaut's built in Jackson support is it? Maybe I don't understand how that would be used.