VanDavv VanDavv - 7 months ago 165
Java Question

IllegalStateException within method with Response paramether

I wrote a simple class to test response reading entity method (if it works as I expect). But it didn't worked well.

When I launch my class I get following error at

response.readEntity()
:


Exception in thread "main" java.lang.IllegalStateException: Method not supported on an outbound message.
at org.glassfish.jersey.message.internal.OutboundJaxrsResponse.readEntity(OutboundJaxrsResponse.java:150)



And here's the code I wrote

public static void main(String[] args) {
List<Entity> representations = new ArrayList<>();
representations.add(new Entity("foo", "baz", false));
representations.add(new Entity("foo1", "baz1", true));
representations.add(new Entity("foo2", "baz2", false));
Response build = Response.ok(representations).build();
printEntitesFromResponse(build);
}

public static void printEntitesFromResponse(Response response) {
response
.readEntity(new GenericType<List<Entity>>() {})
.stream()
.forEach(entity -> System.out.println(entity));
}


What am I doing wrong?

Answer

There are two types of Responsees, inbound and outbound, though they still use the same interface. Outbound is when you are sending a response from the server

Response response = Response.ok(entity).build();

Inbound is when you are receiving the response on the client side.

Response response = webTarget.request().get();

The readEntity method is disabled on the server side outbound response, because you don't need it. It is only used when you need to _de_serialize the response from the response stream. But there is none when it's outbound.

If you want the entity on the outbound response, just use Response#getEntity()