Zilla Crashes on invalid request payload

[ankitk-me]

Describe the bug
Zilla instance crashes when invalid event like { "test": "test" } is sent to schema validation enabled endpoint.

To Reproduce
Steps to reproduce the behavior:

1. Go to openapi.proxy example
2. Update Pet Schema with mentioned field:

Pet:
      type: object
      required:
        - eventType
        - eventTime
        - eventId
        - event

3. Start the example using ./setup.sh
4. Trigger mentioned request:

curl -i -X POST http://localhost:7114/pets \
        -H "Content-Type: application/json" \
        -d '{ "test": "test" }'

5. Zilla crashes with mentioned exception:

org.agrona.concurrent.AgentTerminationException: java.lang.IllegalArgumentException: length=265 is beyond maximum length=254
        at io.aklivity.zilla.runtime.engine@0.9.124/io.aklivity.zilla.runtime.engine.internal.registry.EngineWorker.doWork(EngineWorker.java:858)
        at org.agrona.core/org.agrona.concurrent.AgentRunner.doWork(AgentRunner.java:304)
        at org.agrona.core/org.agrona.concurrent.AgentRunner.workLoop(AgentRunner.java:296)
        at org.agrona.core/org.agrona.concurrent.AgentRunner.run(AgentRunner.java:162)
        at java.base/java.lang.Thread.run(Thread.java:1570)
Caused by: java.lang.IllegalArgumentException: length=265 is beyond maximum length=254
        at io.aklivity.zilla.runtime.model.json@0.9.124/io.aklivity.zilla.runtime.model.json.internal.types.String8FW$Builder.checkLength(String8FW.java:163)
        at io.aklivity.zilla.runtime.model.json@0.9.124/io.aklivity.zilla.runtime.model.json.internal.types.String8FW$Builder.set(String8FW.java:148)
        at io.aklivity.zilla.runtime.model.json@0.9.124/io.aklivity.zilla.runtime.model.json.internal.types.event.JsonModelValidationFailedExFW$Builder.error(JsonModelValidationFailedExFW.java:117)
...
stopped

Expected behavior
Validation should work as expected & we should observe mentioned validation failure event in log for given request.

zilla-openapi-proxy:north_openapi_server [04/Feb/2025:15:03:10 +0000] MODEL_JSON_VALIDATION_FAILED A message payload failed validation. [1,18][] The object must have a property whose name is "eventType".
[1,18][] The object must have a property whose name is "eventTime".
[1,18][] The object must have a property whose name is "eventId".
[1,18][] The object must have a property whose name is "event".