toolisticon / jackson-avro-module

Serialize/Deserialize generated avro records to/from json using jackson objectMapper

jackson-avro-module

A jackson-module that allows serializing and deserializing generated avro specific record instances with the jackson ObjectMapper.

The problem

If you define your schema in avro and generate a class using the avro generator, the generated class contains fields (schema, specificData) that can not be serialized by the default jackson ObjectMapper.

Non working workarounds

• avro itself provides a JacksonUtils class that can ignore fields based on visibility. Problem: The feature is hidden and modifies the global ObjectMapper, so a change only required for SpecificRecordBase classes will affect all.
• jackson on the other hand provides the com.fasterxml.jackson.dataformat.avro.AvroSerializerModifier, but this one just ignores (current version 2.13.4) just one of the two needed properties.

The solution

This library provides a single JacksonAvroModule that uses a modified version of the jackson-databind-avro modifier to exclude bean properties from serialization.

How to use

It is as simple as adding any other jackson-module to your ObjectMapper configuration:

ObjectMapper om = new ObjectMapper()
                      .registerModule(new JacksonAvroModule());