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https://issues.apache.org/jira/browse/KAFKA-7799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16737736#comment-16737736
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ASF GitHub Bot commented on KAFKA-7799:
---------------------------------------
hachikuji commented on pull request #6106: KAFKA-7799; Fix flaky test
RestServerTest.testCORSEnabled
URL: https://github.com/apache/kafka/pull/6106
The test fails 100% of the time if `testOptionsDoesNotIncludeWadlOutput` is
executed before `testCORSEnabled`. It seems the problem is the use of the
system property. Perhaps there is some static caching somewhere.
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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> 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
> Assignee: Jason Gustafson
> Priority: Major
>
> 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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