eolivelli opened a new issue #8882:
URL: https://github.com/apache/pulsar/issues/8882
**Describe the bug**
It looks like GenericJsonReader is not handling correctly `null` values
This is a reproducer:
```
byte[] json = "{\"somefield\":null}".getBytes();
GenericJsonRecord record =
new GenericJsonReader(Collections.singletonList(new
Field("somefield", 0)))
.read(json, 0, json.length);
assert record.getJsonNode().get("somefield").isNull();
assert "null".equals(record.getField("somefield"));
assert record.getField("somefield") != null;
```
**Expected behavior**
The null value is not converted to a string, but it is still a null value
**Additional context**
The problem affects Pulsar Functions/Pulsar IO
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