[ 
https://issues.apache.org/jira/browse/TEZ-3536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Hitesh Shah updated TEZ-3536:
-----------------------------
    Description: 

{code}
 [ERROR] [ServiceThread:org.apache.tez.dag.app.web.WebUIService] 
|web.WebUIService|: Tez UI WebService failed to start.
java.lang.NullPointerException
        at 
org.apache.tez.dag.app.web.WebUIService.serviceStart(WebUIService.java:98)
        at 
org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
        at 
org.apache.tez.dag.app.DAGAppMaster$ServiceWithDependency.start(DAGAppMaster.java:1657)
        at 
org.apache.tez.dag.app.DAGAppMaster$ServiceThread.run(DAGAppMaster.java:1678)
 [INFO] [ServiceThread:org.apache.tez.dag.app.web.WebUIService] 
|service.AbstractService|: Service org.apache.tez.dag.app.web.WebUIService 
failed in state STARTED; cause: org.apache.tez.dag.api.TezUncheckedException: 
java.lang.NullPointerException
org.apache.tez.dag.api.TezUncheckedException: java.lang.NullPointerException
        at 
org.apache.tez.dag.app.web.WebUIService.serviceStart(WebUIService.java:103)
        at 
org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
        at 
org.apache.tez.dag.app.DAGAppMaster$ServiceWithDependency.start(DAGAppMaster.java:1657)
        at 
org.apache.tez.dag.app.DAGAppMaster$ServiceThread.run(DAGAppMaster.java:1678)
Caused by: java.lang.NullPointerException
        at 
org.apache.tez.dag.app.web.WebUIService.serviceStart(WebUIService.java:98)
        ... 3 more
{code}


  was:
2016-10-25 03:15:22,200 [ERROR] 
[ServiceThread:org.apache.tez.dag.app.web.WebUIService] |web.WebUIService|: Tez 
UI WebService failed to start.
java.lang.NullPointerException
        at 
org.apache.tez.dag.app.web.WebUIService.serviceStart(WebUIService.java:98)
        at 
org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
        at 
org.apache.tez.dag.app.DAGAppMaster$ServiceWithDependency.start(DAGAppMaster.java:1657)
        at 
org.apache.tez.dag.app.DAGAppMaster$ServiceThread.run(DAGAppMaster.java:1678)
2016-10-25 03:15:22,205 [INFO] 
[ServiceThread:org.apache.tez.dag.app.web.WebUIService] 
|service.AbstractService|: Service org.apache.tez.dag.app.web.WebUIService 
failed in state STARTED; cause: org.apache.tez.dag.api.TezUncheckedException: 
java.lang.NullPointerException
org.apache.tez.dag.api.TezUncheckedException: java.lang.NullPointerException
        at 
org.apache.tez.dag.app.web.WebUIService.serviceStart(WebUIService.java:103)
        at 
org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
        at 
org.apache.tez.dag.app.DAGAppMaster$ServiceWithDependency.start(DAGAppMaster.java:1657)
        at 
org.apache.tez.dag.app.DAGAppMaster$ServiceThread.run(DAGAppMaster.java:1678)
Caused by: java.lang.NullPointerException
        at 
org.apache.tez.dag.app.web.WebUIService.serviceStart(WebUIService.java:98)
        ... 3 more


> Add debug logs to help debug NPE in WebUIService start
> ------------------------------------------------------
>
>                 Key: TEZ-3536
>                 URL: https://issues.apache.org/jira/browse/TEZ-3536
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Hitesh Shah
>
> {code}
>  [ERROR] [ServiceThread:org.apache.tez.dag.app.web.WebUIService] 
> |web.WebUIService|: Tez UI WebService failed to start.
> java.lang.NullPointerException
>       at 
> org.apache.tez.dag.app.web.WebUIService.serviceStart(WebUIService.java:98)
>       at 
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
>       at 
> org.apache.tez.dag.app.DAGAppMaster$ServiceWithDependency.start(DAGAppMaster.java:1657)
>       at 
> org.apache.tez.dag.app.DAGAppMaster$ServiceThread.run(DAGAppMaster.java:1678)
>  [INFO] [ServiceThread:org.apache.tez.dag.app.web.WebUIService] 
> |service.AbstractService|: Service org.apache.tez.dag.app.web.WebUIService 
> failed in state STARTED; cause: org.apache.tez.dag.api.TezUncheckedException: 
> java.lang.NullPointerException
> org.apache.tez.dag.api.TezUncheckedException: java.lang.NullPointerException
>       at 
> org.apache.tez.dag.app.web.WebUIService.serviceStart(WebUIService.java:103)
>       at 
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
>       at 
> org.apache.tez.dag.app.DAGAppMaster$ServiceWithDependency.start(DAGAppMaster.java:1657)
>       at 
> org.apache.tez.dag.app.DAGAppMaster$ServiceThread.run(DAGAppMaster.java:1678)
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.tez.dag.app.web.WebUIService.serviceStart(WebUIService.java:98)
>       ... 3 more
> {code}



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