a8091b916b
Prior to this commit, a change introduced in gh-25910 would close the `JsonGenerator` after it's been used for JSON serialization. This would not only close it and recycle resources, but also flush the underlyning buffer to the output. In a case where the JSON serialization process would throw an exception, the buffer would be still flushed to the response output. Before the change introduced in gh-25910, the response body could be still empty at that point and error handling could write an error body instead. This commits only closes the `JsonGenerator` when serialization has been successful. Note that we're changing this in the spirit of backwards compatibility in the 5.2.x line, but change this won't be merged forward on the 5.3.x line, for several reasons: * this behavior is not consistent. If the JSON output exceeds a certain size, or if Jackson has been configured to flush after each write, the response output might still contain an incomplete JSON payload (just like before this change) * this behavior is not consistent with the WebFlux and Messaging codecs, which are flushing or closing the generator * not closing the generator for error cases prevents resources from being recycled as expected by Jackson Fixes gh-26246
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