spring-projects / spring-projects/spring-hateoas
HttpMessageNotWritableException occurs when a field on an object has a @DBRef annotation
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Description
Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: (was java.lang.NullPointerException); nested exception is com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: org.springframework.hateoas.Resource["content"])
I have attached a zip file with an example webservice, including a README with steps to reproduce this issue.
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First steps
- Read the whole issue, then the project's contributing guide.
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- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Unpack exampleWebservice.zip and read its README first, then follow the reproduction steps for the HttpMessageNotWritableException involving @DBRef and Resource["content"]. Done means the example no longer fails while writing the HTTP response, with the reproduced behavior checked against the original stack trace.
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Assessment
- Tech stack
- java, spring
- Domain
- api, backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100