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https://issues.apache.org/jira/browse/HDFS-13933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818631#comment-16818631
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Siyao Meng commented on HDFS-13933:
-----------------------------------

Same error with 4 TestKMS unit tests:
{code}
[ERROR] testDelegationTokensOpsHttpsKerberized(org.apache.hadoop.crypto.key.kms.
server.TestKMS)  Time elapsed: 1.784 s  <<< ERROR!
java.io.IOException: HTTPS hostname wrong:  should be <localhost>
        at java.base/sun.net.www.protocol.https.HttpsClient.checkURLSpoofing(Htt
psClient.java:648)
        at java.base/sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsCl
ient.java:581)
        at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnecti
on.connect(AbstractDelegateHttpsURLConnection.java:185)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0
(HttpURLConnection.java:1581)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(
HttpURLConnection.java:1509)
        at java.base/java.net.HttpURLConnection.getResponseCode(HttpURLConnectio
n.java:527)
        at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getRespon
seCode(HttpsURLConnectionImpl.java:329)
        at org.apache.hadoop.util.HttpExceptionUtils.validateResponse(HttpExcept
ionUtils.java:140)
...
{code}
Other three failed TestKMS tests (related) are:
{code}
TestKMS.testDelegationTokensOpsHttpsPseudo
TestKMS.testStartStopHttpsKerberos
TestKMS.testStartStopHttpsPseudo
{code}
Compiled with JDK 8 and ran on OpenJDK 11. The root cause should be the same.

> [JDK 11] SWebhdfsFileSystem related tests fail with hostname verification 
> problems for "localhost"
> --------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-13933
>                 URL: https://issues.apache.org/jira/browse/HDFS-13933
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>            Reporter: Andrew Purtell
>            Priority: Minor
>
> Tests with issues:
> * TestHttpFSFWithSWebhdfsFileSystem
> * TestWebHdfsTokens
> * TestSWebHdfsFileContextMainOperations
> Possibly others. Failure looks like 
> {noformat}
> java.io.IOException: localhost:50260: HTTPS hostname wrong:  should be 
> <localhost>
> {noformat}
> These tests set up a trust store and use HTTPS connections, and with Java 11 
> the client validation of the server name in the generated self-signed 
> certificate is failing. Exceptions originate in the JRE's HTTP client 
> library. How everything hooks together uses static initializers, static 
> methods, JUnit MethodRules... There's a lot to unpack, not sure how to fix. 
> This is Java 11+28



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