Josh Elser commented on ACCUMULO-4444:

bq. Like if the tool isn't mentioned specifically in the User guide or printed 
by accumulo script, how will they find it?

Yeah, this is definitely a hold-out from the old Hadoop days IMO where 
{{accumulo <classname>}} and {{hadoop jar classname}} were very prominent. 
[~ctubbsii]'s use of AutoService was nice in giving us a way to easily list out 
"utilities" which can be invoked. I think this is a big improvement over what 
we had before.

bq. Yeah I thought of that as well yesterday when looking at how to get 
ClientOpts to prompt for a password. The ChangeSecret tool does it by passing 
empty "--" parameters to JCommander and lets JCommander prompt for the 

Hah, quirky. Two thoughts on approaches...

# We pull out what ChangeSecret does with JCommander to a utility that can be 
re-used by other utilities
# We encapsulate the functionality in ClientOpts so that all utilities that use 
ClientOpts will automagically prompt for a password if one is not provided

Both have their edge cases, but either would be a great improvement if you'd 
like to take that on :)

> NullPointerException when password not given to TraceTableStats
> ---------------------------------------------------------------
>                 Key: ACCUMULO-4444
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4444
>             Project: Accumulo
>          Issue Type: Bug
>          Components: trace
>    Affects Versions: 1.7.2, 1.8.0
>         Environment: 1.7.2 cluster
>            Reporter: Sean Busbey
>            Assignee: Michael Miller
>            Priority: Critical
>             Fix For: 1.7.3, 1.8.1, 2.0.0
>          Time Spent: 20m
>  Remaining Estimate: 0h
> I'm trying to follow the [admin guide on 
> tracing|https://accumulo.apache.org/1.7/accumulo_user_manual#_viewing_collected_traces],
>  specifically with the {{TraceTableStats}} command.
> In attempting to get prompted for the password, I provided a username and no 
> password, which resulted in a NullPointerException.
> {code}
> $ accumulo org.apache.accumulo.tracer.TraceTableStats -i accumulo -u foobar
> 2016-09-01 11:05:47,420 [conf.ConfigSanityCheck] WARN : Use of 
> instance.dfs.uri and instance.dfs.dir are deprecated. Consider using 
> instance.volumes instead.
> 2016-09-01 11:05:47,564 [client.ClientConfiguration] WARN : Found no 
> client.conf in default paths. Using default client configuration values.
> 2016-09-01 11:05:47,567 [client.ClientConfiguration] WARN : Found no 
> client.conf in default paths. Using default client configuration values.
> 2016-09-01 11:05:47,720 [start.Main] ERROR: Thread 
> 'org.apache.accumulo.tracer.TraceTableStats' died.
> java.lang.NullPointerException
>         at 
> org.apache.accumulo.core.client.impl.ConnectorImpl.<init>(ConnectorImpl.java:59)
>         at 
> org.apache.accumulo.core.client.ZooKeeperInstance.getConnector(ZooKeeperInstance.java:248)
>         at 
> org.apache.accumulo.core.cli.ClientOpts.getConnector(ClientOpts.java:315)
>         at 
> org.apache.accumulo.tracer.TraceTableStats.count(TraceTableStats.java:75)
>         at 
> org.apache.accumulo.tracer.TraceTableStats.main(TraceTableStats.java:71)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:606)
>         at org.apache.accumulo.start.Main$2.run(Main.java:157)
>         at java.lang.Thread.run(Thread.java:745)
> {code}
> The impacted line is checking to see if the credential has expired, without 
> checking to see if there is a credential in the first place, I think?
> {code}
> 57  public ConnectorImpl(final ClientContext context) throws 
> AccumuloException, AccumuloSecurityException {
> 58    checkArgument(context != null, "context is null");
> 59    if (context.getCredentials().getToken().isDestroyed())
> 60      throw new 
> AccumuloSecurityException(context.getCredentials().getPrincipal(), 
> SecurityErrorCode.TOKEN_EXPIRED);
> {code}

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