jackson objectMapper Error “No serializer found for class”

No serializer found for class and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.SerializationFeature.FAIL_ON_EMPTY_BEANS) )

The above error in Java is encountered when we use static field with objectMapper like

private static String name;
HelloWorld helloClasscar = new HelloWorld();
helloClasscar.name=”Test”;
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.writeValue( new FileOutputStream(“src/output.json”), helloClasscar);

Jackson supports only those fields that are either public, or have a public getter methods. Serializing an entity that has all fields private or package private will fail:

Solution: Options to resolve this issue:


1) Either create getter for the fields:
@Getter
@Setter
private String name;

2) Jackson provide below to allow the private and package private fields to be detected without getters, and serialization will work correctly


private String name;
objectMapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);

More details: https://www.baeldung.com/jackson

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