Invalid non-JSON request ("Unexpected character") results in SERVER_UNHANDLED_ERROR 500 failure

[tatu-at-datastax]

Going through unmapped exceptions in Splunk logs, I see exceptions like:

Unrecognized exception caught, mapped to SERVER_UNHANDLED_ERROR: Unexpected 
character ('d' (code 100)): was expecting double-quote to start field name

which suggests invalid payload (malformed "JSON") where client sends unquoted JSON Field names

{debug: true}

Or something.

Unfortunately logging currently does not include source content (will file separate issue for enabling)

Full stack trace:

stackTrace: : com.fasterxml.jackson.core.JsonParseException: Unexpected character ('d' (code 100)): was expecting double-quote to start field name
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); line: 2, column: 4]
	at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:2481)
	at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:752)
	at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:676)
	at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._handleOddName(UTF8StreamJsonParser.java:2147)
	at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._parseName(UTF8StreamJsonParser.java:1797)
	at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.nextToken(UTF8StreamJsonParser.java:801)
	at com.fasterxml.jackson.databind.jsontype.impl.AsWrapperTypeDeserializer._deserialize(AsWrapperTypeDeserializer.java:95)
	at com.fasterxml.jackson.databind.jsontype.impl.AsWrapperTypeDeserializer.deserializeTypedFromObject(AsWrapperTypeDeserializer.java:52)
	at com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserializeWithType(AbstractDeserializer.java:263)
	at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:74)
	at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:342)
	at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:2125)
	at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1501)
	at io.quarkus.resteasy.reactive.jackson.runtime.serialisers.ServerJacksonMessageBodyReader.doReadFrom(ServerJacksonMessageBodyReader.java:87)
	at io.quarkus.resteasy.reactive.jackson.runtime.serialisers.ServerJacksonMessageBodyReader.readFrom(ServerJacksonMessageBodyReader.java:38)
	at io.quarkus.resteasy.reactive.jackson.runtime.serialisers.ServerJacksonMessageBodyReader.readFrom(ServerJacksonMessageBodyReader.java:77)
	at org.jboss.resteasy.reactive.server.handlers.RequestDeserializeHandler.readFrom(RequestDeserializeHandler.java:126)
	at org.jboss.resteasy.reactive.server.handlers.RequestDeserializeHandler.handle(RequestDeserializeHandler.java:84)