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https://issues.apache.org/jira/browse/HADOOP-3612?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HADOOP-3612 started by Steve Loughran.
> NPE if the system can't determine its own name and you go
> DNS.getDefaultHost(null)
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-3612
> URL: https://issues.apache.org/jira/browse/HADOOP-3612
> Project: Hadoop Core
> Issue Type: Bug
> Affects Versions: 0.18.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
>
> In a test case that I am newly writing, on my infamous "home machine with
> broken DNS", I cant call getByName(null) without seeing a stack trace:
> Testcase: testNullInterface took 0.014 sec
> Caused an ERROR
> null
> java.lang.NullPointerException
> at java.net.NetworkInterface.getByName(NetworkInterface.java:226)
> at org.apache.hadoop.net.DNS.getIPs(DNS.java:94)
> at org.apache.hadoop.net.DNS.getHosts(DNS.java:141)
> at org.apache.hadoop.net.DNS.getDefaultHost(DNS.java:218)
> at org.apache.hadoop.net.DNS.getDefaultHost(DNS.java:235)
> at org.apache.hadoop.net.TestDNS.testNullInterface(TestDNS.java:62)
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