2.15.0 com.fasterxml.jackson.databind.JsonMappingException: String length (5046272) exceeds the maximum length (5000000)

[mail4csm]

On very big json (~20MB), convertion (serialization) string to object is not possible, error is thrown:
com.fasterxml.jackson.databind.JsonMappingException: String length (5046272) exceeds the maximum length (5000000) ..
Conversion works on version: 2.14.2
Conversion does not work on version: 2.15.0

[pjfanning]

This is one the main features of the Jackson 2.15 release - an attempt to have Jackson fail if malicious input is provided.

Most users do not use such large text entries in their JSON.

You can increase the limits by creating a StreamReadConstraints instance and configuring your ObjectMapper with it.

You can increase the string limit from 5 million to 10 million like this:

objectMapper.getFactory()
		.setStreamReadConstraints(StreamReadConstraints.builder().maxStringLength(10_000_000).build())

Or

JsonFactory jsonFactory = JsonFactory.builder()
  .streamReadConstraints(StreamReadConstraints.builder().maxStringLength(10_000_000)
  .build();

ObjectMapper objectMapper = JsonMapper.builder(jsonFactory).build();

[mail4csm]

perfect

[denizk]

Just came across this ticket after upgrading to 2.16.1.

I've tried the method to override the default StreamReadConstraints._maxNameLen value of 50_000 with

objectMapper.factory.setStreamReadConstraints(StreamReadConstraints.builder().maxNameLength(100_000).build())

However, this does not adjust the StreamReadConstraints used in

JsonFactory._rootCharSymbols = CharsToNameCanonicalizer.createRoot(this); 

which are initialised at JsonFactory construction time, so will end up with the defaults and inherit it to children used in JsonParsers when calling this._rootCharSymbols.makeChild()

So, best to use the 2nd approach mentioned by @pjfanning in #1001 (comment)

[cowtowncoder]

@denizk Ok thank you for bringing this up. It is unfortunate. I will file an issue for this problem.

Second method would be preferred in general, but both should work.