How do I disable fail on empty beans in Jackson

Question

Using jackson 2 1  how do I disable the fail on empty beans that the error message seems to want me to disable    I m assuming this is just the simplest thing in the world  but hell it is late and I haven t been able to find a simple tutorial or anything particularly obvious from the api  SerializationFactory  Why would they make it so unintuitive and then make the error message seem so straightforward   Although I do like the error message  I mean  it is better than an NPE   I m assuming there is a way to do this using annotations - but I m not keen on using them at all for the simplistic work I m doing

User · Answer

ObjectMapper mapper   new ObjectMapper      Hi   When I use mapper configure SerializationFeature FAIL ON EMPTY BEANS  false   My json object values come    blank in angular page mean in response  Solved with the help of only below settings  mapper setVisibility mapper getSerializationConfig   getDefaultVisibilityChecker    withFieldVisibility JsonAutoDetect Visibility ANY  withGetterVisibility JsonAutoDetect Visibility NONE                   withSetterVisibility JsonAutoDetect Visibility NONE                   withCreatorVisibility JsonAutoDetect Visibility NONE

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If you wish to get JSON object without any extra fields - please add this annotation to your class  it worked perfect for me    JsonIgnoreProperties   hibernateLazyInitializer    handler      You can also add in your application properties file this row  but it will add an extra field to your JSON   spring jackson serialization FAIL ON EMPTY BEANS false

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You can also get the same issue if your class doesn t contain any public methods properties   I normally have dedicated DTOs for API requests and responses  declared public  but forgot in one case to make the methods public as well - which caused the  empty  bean in the first place

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In my case  I missed to write  JsonProperty annotation in one of the fields which was causing this error

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In Jersey Rest Services just use the JacksonFeatures annotation       JacksonFeatures serializationDisable    SerializationFeature FAIL ON EMPTY BEANS   public Response getSomething         Object entity   doSomething        return Response ok entity  build

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In my case I didnt need to disable it   rather I had to put this code on top of my class    and this solved my issue       JsonNaming PropertyNamingStrategy SnakeCaseStrategy class   this is what was added      Value   this was there already      Builder  this was there already  public class NameOfClass          some code in here

User · Answer

T o fix this issue configure your JsonDataFormat class like below  ObjectMapper mapper   new ObjectMapper    mapper disable SerializationFeature FAIL ON EMPTY BEANS     which is almost equivalent to   mapper configure SerializationConfig Feature FAIL ON EMPTY BEANS  false

User · Answer

If you are using Spring Boot  you can set the following property in application properties file  spring jackson serialization FAIL ON EMPTY BEANS false

User · Answer

You can also probably annotate the class with  JsonIgnoreProperties ignoreUnknown true  to ignore the fields undefined in the class

User · Answer

If you use org codehaus jackson map ObjectMapper  then pls  use the following lines  mapper configure SerializationConfig Feature FAIL ON EMPTY BEANS  false

User · Answer

Adding a solution here for a different problem  but one that manifests with the same error    Take care when constructing json on the fly  as api responses or whatever  to escape literal double quotes in your string members  You may be consuming your own malformed json

User · Answer

You can do this per class or globally  I believe   For per class  try  JsonSerialize above class declaration   For a mapper  here s one example   ObjectMapper mapper   new ObjectMapper    mapper configure SerializationFeature FAIL ON EMPTY BEANS  false      do various things  perhaps  String someJsonString   mapper writeValueAsString someClassInstance   SomeClass someClassInstance   mapper readValue someJsonString  SomeClass class    The StackOverflow link below also has an example for a Spring project   For REST with Jersey  I don t remember off the top off my head  but I believe it s similar     Couple of links I dug up   edited 1st link due to Codehaus shutting down     https   web archive org web 20150513164332 https   jira codehaus org browse JACKSON-201 Jackson serializationConfig

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If it is a Spring App  just paste the code in config class          Bean         public ObjectMapper getJacksonObjectMapper                 ObjectMapper objectMapper   new ObjectMapper                objectMapper findAndRegisterModules                objectMapper configure                      com fasterxml jackson databind SerializationFeature WRITE DATES AS TIMESTAMPS  false               objectMapper setSerializationInclusion JsonInclude Include NON NULL               objectMapper configure DeserializationFeature FAIL ON UNKNOWN PROPERTIES  false               return objectMapper

[java] How do I disable fail_on_empty_beans in Jackson?

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