org.springframework.core.codec.DecodingException: JSON decoding error: Illegal character ((CTRL-CHAR, code 31))

Question

I am getting the following error getting a response of a post method via WebClient(org.springframework.web.reactive.function.client)

org.springframework.core.codec.DecodingException: JSON decoding error: Illegal character ((CTRL-CHAR, code 31)): only regular white space (\r, \n, \t) is allowed between tokens; nested exception is com.fasterxml.jackson.core.JsonParseException: Illegal character ((CTRL-CHAR, code 31)): only regular white space (\r, \n, \t) is allowed between tokens
at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 2]
at org.springframework.http.codec.json.AbstractJackson2Decoder.processException(AbstractJackson2Decoder.java:215)
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: Ȁ

I have tried changing the headers of the request as under with failure :-

headers.put("Accept-Encoding", "gzip");

or

headers.put("Accept-Encoding", "identity");

Is it that webclient is unable to process the gzipped response for any reason!!

Thanks in advance!!

Have you read this? stackoverflow.com/questions/42621547/… — z atef
– z atef, Commented Aug 27, 2020 at 3:45
yes. Basically i am getting the issue from webclient. The issue is basically how to resolve the same JSonParseException in webclient. — Nilotpal
– Nilotpal, Commented Aug 27, 2020 at 4:01
Can you parse the payload manually? set a debugger or inspect what the client is sending and try to parse it. also try sending the same post request using a different client "postman, curl..etc" — z atef
– z atef, Commented Aug 27, 2020 at 4:03
Yes when the endpoint is POSTed in postman, it gives JSON response. — Nilotpal
– Nilotpal, Commented Aug 27, 2020 at 4:06
Can test if the token is valid using something like this: gist.github.com/thomasdarimont/46358bc8167fce059d83a1ebdb92b0e7 — z atef
– z atef, Commented Aug 27, 2020 at 4:09

Vivek Arora · Accepted Answer · 2021-04-22 04:03:08Z

5

Remove header ("Accept-Encoding", "gzip") You will not get JSON decoding error: Illegal character ((CTRL-CHAR, code 31))

If the response length is increased beyond default threshold then response would be gziped and it will give JSON decoding error.

answered Apr 22, 2021 at 4:03

Vivek Arora

491 silver badge3 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Nilotpal · Accepted Answer · 2020-08-28 02:48:19Z

0

I missed implementing Serializable to the response object.

answered Aug 28, 2020 at 2:48

Nilotpal

3,6388 gold badges42 silver badges65 bronze badges

1 Comment

z atef Over a year ago

I see where the issue is.

Prasanth Rajendran · Accepted Answer · 2020-11-12 13:53:02Z

I have started getting this exception with Spring boot's feign dependency spring-cloud-openfeign-core when I upgrade the version of spring-cloud-openfeign-core to 2.2.5.RELEASE.

For those who upgrade to version 2.2.5.RELEASE or later version will face this issue if they already have the property feign.request.compression=true.

The technical reason behind this is, in FeignContentGzipEncodingAutoConfiguration class the conditional property annotation signature changed from @ConditionalOnProperty("feign.compression.request.enabled", matchIfMissing = false) to @ConditionalOnProperty(value = "feign.compression.request.enabled"), so by default FeignContentGzipEncodingInterceptor is triggered. GitHub reference

Workaround

If your calling a spring-boot service which doesn't have a mechanism to handle the compressed request then disable the feign request compression using the below property

feign.request.compression=false.

NOTE: Unfortunately, we still don't have the out-of-box solution in spring-boot to handle the compressed request refer

Wei · Accepted Answer · 2025-04-08 08:50:05Z

0

If you are using springcloud feign, you can set header as follows in FeignRequestInterceptor

requestTemplate.header("Accept-Encoding", "identity");

edited Apr 8 at 8:50

answered Apr 8 at 5:41

Wei

11 bronze badge

Collectives™ on Stack Overflow

org.springframework.core.codec.DecodingException: JSON decoding error: Illegal character ((CTRL-CHAR, code 31))

4 Answers 4

Comments

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related