[jira] [Created] (KAFKA-7799) Fix flaky test RestServerTest.testCORSEnabled

["Jason Gustafson (JIRA)" <ji...@apache.org>]

Jason Gustafson created KAFKA-7799:
--------------------------------------

             Summary: Fix flaky test RestServerTest.testCORSEnabled
                 Key: KAFKA-7799
                 URL: https://issues.apache.org/jira/browse/KAFKA-7799
             Project: Kafka
          Issue Type: Test
          Components: KafkaConnect
            Reporter: Jason Gustafson


Starting to see this failure quite a lot, locally and on jenkins:

{code}

org.apache.kafka.connect.runtime.rest.RestServerTest.testCORSEnabled

Failing for the past 7 builds (Since Failed#18600 )
Took 0.7 sec.
Error Message
java.lang.AssertionError: expected:<http://bar.com> but was:<null>
Stacktrace
java.lang.AssertionError: expected:<http://bar.com> but was:<null>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:834)
	at org.junit.Assert.assertEquals(Assert.java:118)
	at org.junit.Assert.assertEquals(Assert.java:144)
	at org.apache.kafka.connect.runtime.rest.RestServerTest.checkCORSRequest(RestServerTest.java:221)
	at org.apache.kafka.connect.runtime.rest.RestServerTest.testCORSEnabled(RestServerTest.java:84)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:68)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:326)
	at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:89)
	at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:97)
{code}

If it helps, I see an uncaught exception in the stdout:

{code}
[2019-01-08 19:35:23,664] ERROR Uncaught exception in REST call to /connector-plugins/FileStreamSource/validate (org.apache.kafka.connect.runtime.rest.errors.ConnectExceptionMapper:61)
javax.ws.rs.NotFoundException: HTTP 404 Not Found
	at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:274)
	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:272)
	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:268)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:316)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:298)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:268)
	at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289)
	at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256)
	at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:703)
{code}



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