MarvinCai opened a new issue #9605:
URL: https://github.com/apache/pulsar/issues/9605
**Describe the bug**
Pojo serialized with GenericJsonSchema can't be reconstruct back to original
class.
Code snippet:
```
@Data
@AllArgsConstructor
@NoArgsConstructor
private static class Seller {
public String state;
public String street;
public long zipCode;
}
@Data
@AllArgsConstructor
@NoArgsConstructor
private static class PC {
public String brand;
public String model;
public int year;
public GPU gpu;
public Seller seller;
}
private enum GPU {
AMD, NVIDIA
}
JSONSchema jsonSchema =
JSONSchema.of(SchemaDefinition.builder().withPojo(PC.class).build());
GenericSchema genericJsonSchema =
GenericJsonSchema.of(jsonSchema.getSchemaInfo());
PC pc = new PC("dell", "alienware", 2021, GPU.AMD, new Seller("WA",
"street", 98004));
String pStr = ObjectMapperFactory.getThreadLocal().writeValueAsString(pc);
JsonNode jsonNode = ObjectMapperFactory.getThreadLocal().readTree(pStr);
GenericJsonRecord genericJsonRecord = new GenericJsonRecord(null, null,
jsonNode, genericJsonSchema.getSchemaInfo());
ObjectMapperFactory.getThreadLocal().treeToValue(((GenericJsonRecord)genericJsonSchema.decode((genericJsonSchema.encode(genericJsonRecord)))).getJsonNode(),
PC.class);
```
Exception was thrown:
```
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot
construct instance of `org.apache.pulsar.broker.admin.TopicsTest$PC` (although
at least one Creator exists): no String-argument constructor/factory method to
deserialize from String value
('{"brand":"dell","model":"alienware","year":2021,"gpu":"AMD","seller":{"state":"WA","street":"street","zipCode":98004}}')
at [Source: UNKNOWN; line: -1, column: -1]
```
**To Reproduce**
Use above code snippet.
**Expected behavior**
Should be able to reconstruct original pojo.
Suspect due to the "toString()"
[here](https://github.com/apache/pulsar/blob/7bf7cdda1a2181c329176b403f7a60fc84f557fa/pulsar-client/src/main/java/org/apache/pulsar/client/impl/schema/generic/GenericJsonWriter.java#L39)
causing json written as string first.
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