Post empty body with Jersey 2 client

Question

How do I submit a post request with an empty body with a Jersey 2 client?

final MyClass result = ClientBuilder.newClient()     .target("http://localhost:8080")     .path("path")     .queryParam("key", "value")     .request(APPLICATION_JSON)     .post(What to fill in here if the body should be left empty??, MyClass.class); 

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Update: this works:

final MyClass result = ClientBuilder     .newBuilder().register(JacksonFeature).build()     .target("http://localhost:8080")     .path("path")     .queryParam("key", "value")     .request(APPLICATION_JSON)     .post(null, MyClass.class); 

Answer 1

I can't find this in the doc's anywhere, but I believe you can use null to get an empty body:

final MyClass result = ClientBuilder.newClient()     .target("http://localhost:8080")     .path("path")     .queryParam("key", "value")     .request(APPLICATION_JSON)     .post(Entity.json(null), MyClass.class) 

Answer 2

I found that this worked for me:

Response r = client     .target(url)     .path(path)     .queryParam(name, value)     .request()     .put(Entity.json("")); 

Pass an empty string, not a null value.