APM EM has the exception java.net.UnknownHostException: Hostname: localhost

Products

• CA Application Performance Management Agent (APM / Wily / Introscope)
• INTROSCOPE

Issue/Introduction

In the EM log the below exception is reported: java.net.UnknownHostException: Hostname: localhost

[ERROR] [Thread-x] [Manager.com.timestock.tess.services.initialization.RunInitializers] Exception in bean initializer; some features won't work 
java.util.concurrent.ExecutionException: com.timestock.common.exceptions.TsRuntimeException: java.net.UnknownHostException: Hostname: localhost 
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252) 
at java.util.concurrent.FutureTask.get(FutureTask.java:111) 
at com.timestock.tess.services.initialization.RunInitializers$RunInitializeMethods.run(RunInitializers.java:111) 
Caused by: com.timestock.common.exceptions.TsRuntimeException: java.net.UnknownHostException: Hostname: localhost 
at com.timestock.tess.services.service.ServicesManager.initialize(ServicesManager.java:130) 
at com.timestock.tess.services.initialization.RunInitializers$IntializeWrapper.call(RunInitializers.java:87) 
at com.timestock.tess.services.initialization.RunInitializers$IntializeWrapper.call(RunInitializers.java:1) 
at com.timestock.tess.util.ThreadPool$ConcurrentCallableTask.call(ThreadPool.java:218) 
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) 
at java.util.concurrent.FutureTask.run(FutureTask.java:166) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
at java.lang.Thread.run(Thread.java:722) 
Caused by: java.net.UnknownHostException: Hostname: localhost 
at com.timestock.tess.util.net.IpUtils.getIPAddress(IpUtils.java:58) 
at com.timestock.tess.services.service.ServicesManager.registerTessEntity(ServicesManager.java:468) 
at com.timestock.tess.services.service.ServicesManager.initialize(ServicesManager.java:105) 
... 8 more

Environment

• APM 10.x

Cause

• This issue will occur when the EM cannot resolve a hostname.

Resolution

1) Check your DNS settings are correct

2) Check the /etc/hosts (there is a possibility that the hosts file has the incorrect name resolution)