You can use a JPA converter to map your Entity to the database.
Just add an annotation similar to this one to your params field:
@Convert(converter = JpaConverterJson.class)
and then create the class in a similar way (this converts a generic Object, you may want to specialize it):
@Converter(autoApply = true)
public class JpaConverterJson implements AttributeConverter<Object, String> {
private final static ObjectMapper objectMapper = new ObjectMapper();
@Override
public String convertToDatabaseColumn(Object meta) {
try {
return objectMapper.writeValueAsString(meta);
} catch (JsonProcessingException ex) {
return null;
// or throw an error
}
}
@Override
public Object convertToEntityAttribute(String dbData) {
try {
return objectMapper.readValue(dbData, Object.class);
} catch (IOException ex) {
// logger.error("Unexpected IOEx decoding json from database: " + dbData);
return null;
}
}
}
That’s it: you can use this class to serialize any object to json in the table.