[CAMEL-12475] Undertow consumer with http4 producer results in Undertow throwing NullPointerException

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.20.3, 2.21.0
• Fix Version/s: 2.20.4, 2.21.2, 2.22.0
• Labels: component

Environment

Operating System: Windows 8

Java version: 1.8

Camel version: 2.21.0

• Estimated Complexity: Unknown
• Assignee: Willem Jiang
• Reporter: Dennis Tychsen
• Created: 01/May/18 10:39
• Updated: 03/May/18 03:22
• Resolved: 03/May/18 03:22

Description

I have a very simple setup of Camel (standalone).

My route is as follows:

public class Application {
    public static void main(String... args) throws Exception {
        Main main = new Main();

        main.addRouteBuilder(new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                restConfiguration().port(8080);

                rest("/pi")
                        .get()
                        .route()
                        .setExchangePattern(ExchangePattern.InOut)
                        .to("https4://api.pi.delivery/v1/pi?bridgeEndpoint=true");
            }
        });

        main.run();
    }
}

Call the endpoint with: 

curl "http://localhost:8080/pi?start=0&numberOfDigits=10"

 

When using camel-undertow for consumer and camel-http4 for producer, I get a NullPointerException.

java.lang.NullPointerException: null
at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:141) ~[undertow-core-1.4.23.Final.jar:1.4.23.Final]
at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:285) ~[undertow-core-1.4.23.Final.jar:1.4.23.Final]
at org.apache.camel.component.undertow.UndertowConsumer.handleRequest(UndertowConsumer.java:142) ~[camel-undertow-2.21.0.jar:2.21.0]
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:336) ~[undertow-core-1.4.23.Final.jar:1.4.23.Final]
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830) ~[undertow-core-1.4.23.Final.jar:1.4.23.Final]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_102]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_102]
at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_102]

However, if I switch out the camel-undertow dependency with camel-jetty, the above route configuration works just fine.