[ 
https://issues.apache.org/jira/browse/HADOOP-17331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17317814#comment-17317814
 ] 

Akira Ajisaka commented on HADOOP-17331:
----------------------------------------

In Java 16, the error is reduced to 2
{quote}
[ERROR] Tests run: 12, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 0.316 
s <<< FAILURE! - in org.apache.hadoop.net.TestDNS
[ERROR] testLookupWithoutHostsFallback(org.apache.hadoop.net.TestDNS)  Time 
elapsed: 0.007 s  <<< ERROR!
java.lang.NoSuchFieldException: modifiers
        at java.base/java.lang.Class.getDeclaredField(Class.java:2549)
        at 
org.apache.hadoop.net.TestDNS.changeDnsCachedHostname(TestDNS.java:251)
        at 
org.apache.hadoop.net.TestDNS.testLookupWithoutHostsFallback(TestDNS.java:222)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
        at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
        at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at 
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:288)
        at 
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:282)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.lang.Thread.run(Thread.java:831)

[ERROR] testLookupWithHostsFallback(org.apache.hadoop.net.TestDNS)  Time 
elapsed: 0.002 s  <<< ERROR!
java.lang.NoSuchFieldException: modifiers
        at java.base/java.lang.Class.getDeclaredField(Class.java:2549)
        at 
org.apache.hadoop.net.TestDNS.changeDnsCachedHostname(TestDNS.java:251)
        at 
org.apache.hadoop.net.TestDNS.testLookupWithHostsFallback(TestDNS.java:200)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
        at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
        at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at 
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:288)
        at 
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:282)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.lang.Thread.run(Thread.java:831)
{quote}

> [JDK 15] TestDNS fails by UncheckedIOException
> ----------------------------------------------
>
>                 Key: HADOOP-17331
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17331
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Akira Ajisaka
>            Priority: Major
>
> After [JDK-8235783|https://bugs.openjdk.java.net/browse/JDK-8235783], 
> DatagramSocket::connect throws UncheckedIOException if connect fails.
> {noformat}
> [INFO] Running org.apache.hadoop.net.TestDNS
> [ERROR] Tests run: 12, Failures: 0, Errors: 5, Skipped: 0, Time elapsed: 
> 0.403 s <<< FAILURE! - in org.apache.hadoop.net.TestDNS
> [ERROR] testNullDnsServer(org.apache.hadoop.net.TestDNS)  Time elapsed: 0.134 
> s  <<< ERROR!
> java.io.UncheckedIOException: java.net.SocketException: Unsupported address 
> type
>       at 
> java.base/sun.nio.ch.DatagramSocketAdaptor.connect(DatagramSocketAdaptor.java:120)
>       at java.base/java.net.DatagramSocket.connect(DatagramSocket.java:341)
> {noformat}
> Full error log: 
> https://gist.github.com/aajisaka/2a24cb2b110cc3d19f7dec6256db6844



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