Add test coverage for issue 36402

for branch 3.2

http/http-advanced/src/main/java/io/quarkus/ts/http/advanced/SseResource.java

@@ -0,0 +1,77 @@
+package io.quarkus.ts.http.advanced;
+
+import java.util.Arrays;
+import java.util.concurrent.locks.LockSupport;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.client.ClientBuilder;
+import jakarta.ws.rs.client.WebTarget;
+import jakarta.ws.rs.core.Context;
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.sse.OutboundSseEvent;
+import jakarta.ws.rs.sse.Sse;
+import jakarta.ws.rs.sse.SseEventSink;
+import jakarta.ws.rs.sse.SseEventSource;
+
+import org.eclipse.microprofile.config.ConfigProvider;
+
+@Path("/sse")
+public class SseResource {
+    @Context
+    Sse sse;
+
+    @GET
+    @Path("/client")
+    public String sseClient() {
+        try {
+            return consumeSse();
+        }
+        // in case that https://github.com/quarkusio/quarkus/issues/36402 throws java.lang.RuntimeException: java.lang.ClassNotFoundException:
+        // catch it and return the error message
+        catch (RuntimeException exception) {
+            return exception.getMessage();
+        }
+    }
+
+    private String consumeSse() {
+        StringBuilder response = new StringBuilder();
+        int port = ConfigProvider.getConfig().getValue("quarkus.http.port", Integer.class);
+
+        /*
+         * Client connects to itself (to server endpoint running on same app),
+         * because for https://github.com/quarkusio/quarkus/issues/36402 to reproduce client must run on native app.
+         * Which cannot be done in test code itself.
+         * This method acts just as a client
+         */
+        WebTarget target = ClientBuilder.newClient().target("http://localhost:" + port + "/api/sse/server");
+        SseEventSource updateSource = SseEventSource.target(target).build();
+        updateSource.register(ev -> {
+            response.append("event: ").append(ev.getName()).append(" ").append(ev.readData());
+            response.append("\n");
+
+        }, thr -> {
+            response.append("Error in SSE, message: ").append(thr.getMessage()).append("\n");
+            response.append(Arrays.toString(thr.getStackTrace()));
+        });
+        updateSource.open();
+
+        LockSupport.parkNanos(1_000_000_000L);
+        return response.toString();
+    }
+
+    @GET
+    @Path("/server")
+    @Produces(MediaType.SERVER_SENT_EVENTS)
+    public void sendSseEvents(@Context SseEventSink eventSink) {
+        eventSink.send(createEvent("test234", "test"));
+    }
+
+    private OutboundSseEvent createEvent(String name, String data) {
+        return sse.newEventBuilder()
+                .name(name)
+                .data(data)
+                .build();
+    }
+}

http/http-advanced/src/main/resources/application.properties

@@ -45,6 +45,8 @@ quarkus.keycloak.policy-enforcer.paths.version.enforcement-mode=DISABLED
 # Application endpoints
 quarkus.keycloak.policy-enforcer.paths.hello.path=/api/hello/*
 quarkus.keycloak.policy-enforcer.paths.hello.enforcement-mode=DISABLED
+quarkus.keycloak.policy-enforcer.paths.sse.path=/api/sse/*
+quarkus.keycloak.policy-enforcer.paths.sse.enforcement-mode=DISABLED
 quarkus.keycloak.policy-enforcer.paths.details.path=/api/details/*
 quarkus.keycloak.policy-enforcer.paths.details.enforcement-mode=DISABLED
 quarkus.keycloak.policy-enforcer.paths.grpc.path=/api/grpc/*

http/http-advanced/src/test/java/io/quarkus/ts/http/advanced/BaseHttpAdvancedIT.java

@@ -8,6 +8,8 @@
 import static org.hamcrest.Matchers.in;
 import static org.hamcrest.Matchers.is;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.api.Assertions.fail;
 
 import java.net.URISyntaxException;
@@ -60,6 +62,7 @@ public abstract class BaseHttpAdvancedIT {
     private static final String PASSWORD = "password";
     private static final String KEY_STORE_PATH = "META-INF/resources/server.keystore";
     private static final int ASSERT_TIMEOUT_SECONDS = 10;
+    private static final String SSE_ERROR_MESSAGE = "java.lang.ClassNotFoundException: Provider for jakarta.ws.rs.sse.SseEventSource.Builder cannot be found";
 
     protected abstract RestService getApp();
 
@@ -242,6 +245,16 @@ public void keepRequestScopeValuesAfterEventPropagation() {
                 "Unexpected requestScope custom context value");
     }
 
+    @Test
+    @Tag("https://github.com/quarkusio/quarkus/issues/36402")
+    public void sseConnectionTest() {
+        String response = getApp().given().get("/api/sse/client").thenReturn().body().asString();
+
+        assertFalse(response.contains(SSE_ERROR_MESSAGE),
+                "SSE failed, https://github.com/quarkusio/quarkus/issues/36402 not fixed");
+        assertTrue(response.contains("event: test234 test"), "SSE failed, unknown bug. Response: " + response);
+    }
+
     protected Protocol getProtocol() {
         return Protocol.HTTPS;
     }