mayil-ai[bot]
commented
1 month ago Here are some code snippets that may help you get started:
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spring-messaging/src/main/java/org/springframework/messaging/converter/KotlinSerializationJsonMessageConverter.java:41-109 | The snippet shows the constructor of KotlinSerializationJsonMessageConverter, which needs updating to use 'ignoreUnknownKeys = true' in the Json instance to prevent exceptions from unknown JSON keys.
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spring-web/src/main/java/org/springframework/http/codec/json/KotlinSerializationJsonDecoder.java:1-53 | The snippet includes the KotlinSerializationJsonDecoder class, which should be updated to catch JsonDecodingException and convert it to DecodingException, ensuring a 400 error is returned.
To address the issue of the application returning a 500 Internal Server Error when an invalid JSON body with unknown keys is sent, follow these steps:
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Modify the JSON Configuration: Update the
KotlinSerializationJsonMessageConverterto use aJsoninstance configured to ignore unknown keys. This prevents exceptions from being thrown due to unexpected keys in the JSON payload.public class KotlinSerializationJsonMessageConverter extends AbstractJsonMessageConverter { private static final Map<Type, KSerializer<Object>> serializerCache = new ConcurrentReferenceHashMap<>(); private final Json json; public KotlinSerializationJsonMessageConverter() { this(Json { ignoreUnknownKeys = true }); } public KotlinSerializationJsonMessageConverter(Json json) { this.json = json; } // Existing methods... } -
Handle JSON Decoding Exceptions: Update the
KotlinSerializationJsonDecoderto catchJsonDecodingExceptionand convert it to aDecodingException. This ensures that a 400 Bad Request is returned instead of a 500 Internal Server Error.@Override protected Object fromJson(String payload, Type resolvedType) { try { return this.json.decodeFromString(serializer(resolvedType), payload); } catch (JsonDecodingException ex) { throw new DecodingException("JSON decoding error: " + ex.getMessage(), ex); } }
Implement these changes to ensure that the application handles invalid JSON inputs gracefully by returning a 400 Bad Request.
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Consider the following controller:
If I run
curl -X POST --location -H "Content-Type: application/json" -d '{"message2": "hello"}', I get a 500 instead of a 400. If I just comment out thefrom theBody` data class, then Spring falls back to Jackson and I get a 400 instead.I did some quick debugging, and it seems that
KotlinSerializationJsonDecoderis at fault here; if you look atorg.springframework. it is catchingcom.fasterxml.jackson.core.JsonProcessingExceptionand throwingorg.springframework.core.codec.DecodingException, which is then caught byorg.springframework.web.reactive.result.method.annotation.AbstractMessageReaderArgumentResolverhashtaghandleReadErrorand converted into aorg.springframework.web.server.ServerWebInputException` which eventually results on a 400.KotlinSerializationJsonDecoder, on the other hand, never catcheskotlinx.serialization.json.internal.JsonDecodingException(which is thrown bydecodeFromString) and converts it toorg.springframework.core.codec.DecodingException, so it bubbles all the way up as a 500 error: