Nexus fails starting: Unable to set localhost

Question

I am trying to install and run Nexus on MacOS via homebrew. The installation went fine so far. Version 2.13 was installed.

The following error occurs when I start via nexus console:

ERROR [jetty-main-1] *SYSTEM net.sf.ehcache.Cache - Unable to set localhost. 
This prevents creation of a GUID. Cause was: 
87.128.123.10.dyn.in-addr.arpa: 87.128.123.10.dyn.in-addr.arpa

java.net.UnknownHostException: 87.128.123.10.dyn.in-addr.arpa: 87.128.123.10.dyn.in-addr.arpa
    at java.net.InetAddress.getLocalHost(InetAddress.java:1475) ~[na:1.7.0_79]
    at net.sf.ehcache.Cache.<clinit>(Cache.java:217) ~[ehcache-core-2.5.1.jar:na]
    at net.sf.ehcache.config.ConfigurationHelper.createCache(ConfigurationHelper.java:303) [ehcache-core-2.5.1.jar:na]
    at net.sf.ehcache.config.ConfigurationHelper.createDefaultCache(ConfigurationHelper.java:219) [ehcache-core-2.5.1.jar:na]
    at net.sf.ehcache.CacheManager.configure(CacheManager.java:648) [ehcache-core-2.5.1.jar:na]
    at net.sf.ehcache.CacheManager.doInit(CacheManager.java:407) [ehcache-core-2.5.1.jar:na]
    at net.sf.ehcache.CacheManager.init(CacheManager.java:357) [ehcache-core-2.5.1.jar:na]
    at net.sf.ehcache.CacheManager.<init>(CacheManager.java:242) [ehcache-core-2.5.1.jar:na]
    at org.sonatype.sisu.ehcache.CacheManagerComponentImpl.createCacheManager(CacheManagerComponentImpl.java:112) [nexus-ehcache-2.13.0-01.jar:2.13.0-01]
    at org.sonatype.sisu.ehcache.CacheManagerComponentImpl.<init>(CacheManagerComponentImpl.java:57) [nexus-ehcache-2.13.0-01.jar:2.13.0-01]
    at org.sonatype.sisu.ehcache.CacheManagerComponentImpl.<init>(CacheManagerComponentImpl.java:52) [nexus-ehcache-2.13.0-01.jar:2.13.0-01]
    at org.sonatype.sisu.ehcache.CacheManagerComponentImpl$$FastClassByGuice$$6e60c0a8.newInstance(<generated>) [sisu-guice-3.1.10.jar:2.13.0-01]
    ...

When I open http://localhost:8081 this 404 error page is shown to me:

The hostname command outputs:

87.128.123.10.dyn.in-addr.arpa

The ifconfig en0 command outputs:

en0: flags=8863 UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST mtu 1500
options=10b
...
inet 10.123.128.87 netmask 0xfffffc00 broadcast 10.123.131.255
nd6 options=1
media: autoselect (100baseTX )
status: active

What should I look for? I looked into `/etc/hosts`. It contained an entry for `127.0.0.1 localhost`. I added `0.0.0.0 localhost`. No difference, though. — JJD, Aug 04 '16 at 08:09
Please try adding adding local IP mapping in hosts. Can you please share ip's listed in ifconfig output and hostname output? — Gautam Jose, Aug 04 '16 at 08:14
Don't add `0.0.0.0 localhost`! that's [a non-routable meta address](https://en.wikipedia.org/wiki/0.0.0.0) that cannot be used that way in your `/etc/hosts` file — Joakim Erdfelt, Aug 04 '16 at 13:38
Looks like ehcache is attempting to perform a reverse DNS lookup (the `in-arpa.addr` part tells us this) of your IP, and DNS has nothing, which causes java to toss a UnknownHostException in your case. (which is really bizarre) — Joakim Erdfelt, Aug 04 '16 at 13:43
@JoakimErdfelt I removed it. Thanks. About the reverse lookup .. strange ... so what now? — JJD, Aug 04 '16 at 14:03
The DNS _might_ have had something without the `dyn` label immediately preceding the `in-addr.arpa` domain - there's no such domain as `dyn.in-addr.arpa`. That said, you're using 10/8 from RFC 1918 so even then you'd still get a "no such host" error. — Alnitak, Aug 09 '16 at 09:36

score 1 · Accepted Answer · answered Aug 04 '16 at 18:28

1

Nexus runs on the /nexus context by default so please try http://localhost:8081/nexus

The 404 page is returned by Jetty so the app server is running fine and everything should be okay.

And if localhost does not work try with your IP number or with 127.0.0.1

answered Aug 04 '16 at 18:28

Manfred Moser

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I will try this on Monday as soon as I sit on this Mac again. Thanks so far for the clarification. – JJD Aug 05 '16 at 09:05

Nexus fails starting: Unable to set localhost

1 Answers1