NPE at DNS.reverse

[sijie]

BUG REPORT

1. Please describe the issue you observed:

• What did you do?

run the test

• What did you expect to see?

tests should pass

• What did you see instead?

It fails at starting the bookie as NPE is thrown at DNS.reverseDns.

java.lang.NullPointerException
	at org.apache.bookkeeper.net.DNS.reverseDns(DNS.java:90)
	at org.apache.bookkeeper.net.DNS.getHosts(DNS.java:225)
	at org.apache.bookkeeper.net.DNS.getDefaultHost(DNS.java:324)
	at org.apache.bookkeeper.net.DNS.getDefaultHost(DNS.java:340)
	at org.apache.bookkeeper.bookie.Bookie.getBookieAddress(Bookie.java:539)
	at org.apache.bookkeeper.bookie.ScanAndCompareGarbageCollector.<init>(ScanAndCompareGarbageCollector.java:96)
	at org.apache.bookkeeper.bookie.GarbageCollectorThread.<init>(GarbageCollectorThread.java:192)
	at org.apache.bookkeeper.bookie.InterleavedLedgerStorage.initialize(InterleavedLedgerStorage.java:107)
	at org.apache.bookkeeper.bookie.SortedLedgerStorage.initialize(SortedLedgerStorage.java:66)
	at org.apache.bookkeeper.bookie.Bookie.<init>(Bookie.java:721)
	at org.apache.bookkeeper.proto.BookieServer.newBookie(BookieServer.java:115)
	at org.apache.bookkeeper.proto.BookieServer.<init>(BookieServer.java:96)
	at org.apache.bookkeeper.test.BookKeeperClusterTestCase.startBookie(BookKeeperClusterTestCase.java:612)
	at org.apache.bookkeeper.test.BookKeeperClusterTestCase.startNewBookieAndReturnAddress(BookKeeperClusterTestCase.java:595)
	at org.apache.bookkeeper.test.BookKeeperClusterTestCase.startNewBookie(BookKeeperClusterTestCase.java:587)
	at org.apache.bookkeeper.test.BookKeeperClusterTestCase.startBKCluster(BookKeeperClusterTestCase.java:219)
	at org.apache.bookkeeper.test.BookKeeperClusterTestCase.setUp(BookKeeperClusterTestCase.java:134)
	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.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.lang.Thread.run(Thread.java:748)