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From Charles Moulliard <ch0...@gmail.com>
Subject Re: NPE with command Help & Karaf Shell Console
Date Fri, 29 Nov 2013 09:40:48 GMT
Yep. If required, I can provide a small project.

@Command(scope = "hyla", name = "help", description = "Displays this help
or help about a command")
public class Help extends HelpAction {

}



On Fri, Nov 29, 2013 at 10:38 AM, Jean-Baptiste Onofré <jb@nanthrax.net>wrote:

> Hi Charles,
>
> do you have description attribute on the @Command annotation ?
>
> Regards
> JB
>
>
> On 11/29/2013 10:32 AM, Charles Moulliard wrote:
>
>> 2.3.3
>>
>>
>> On Fri, Nov 29, 2013 at 10:31 AM, Jean-Baptiste Onofré <jb@nanthrax.net
>> >wrote:
>>
>>  Hi Charles,
>>>
>>> what's the Karaf version (as it changed between 2.x and 3.x) ?
>>>
>>> Regards
>>> JB
>>>
>>>
>>> On 11/29/2013 10:18 AM, Charles Moulliard wrote:
>>>
>>>  Hi,
>>>>
>>>> For a documentation project, I'm currently creating a Java Command Line
>>>> Tool client using our excellent Apache Karaf Shell Console.
>>>> Nevertheless,
>>>> when I try to get help from a command, Gogo & Felix returns a NPE
>>>>
>>>> HylaMain
>>>> java.io.BufferedInputStream@9506dc4
>>>> hyla>echo blabla
>>>> echo blabla
>>>> blabla
>>>> hyla>help echo
>>>> help echo
>>>> [main] ERROR org.apache.karaf.shell.console.jline.Console - Exception
>>>> caught while executing command
>>>> java.lang.NullPointerException
>>>> at
>>>> org.apache.karaf.shell.console.help.HelpAction.
>>>> doExecute(HelpAction.java:40)
>>>> at
>>>> org.apache.karaf.shell.console.AbstractAction.
>>>> execute(AbstractAction.java:33)
>>>> at
>>>> org.apache.felix.gogo.commands.basic.AbstractCommand.execute(
>>>> AbstractCommand.java:35)
>>>> at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:474)
>>>> at org.apache.felix.gogo.runtime.Closure.executeStatement(
>>>> Closure.java:400)
>>>> at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)
>>>> at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:183)
>>>> at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:120)
>>>> at
>>>> org.apache.felix.gogo.runtime.CommandSessionImpl.execute(
>>>> CommandSessionImpl.java:89)
>>>> at org.apache.karaf.shell.console.jline.Console.run(Console.java:173)
>>>> at org.apache.karaf.shell.console.Main.run(Main.java:220)
>>>> at org.apache.karaf.shell.console.Main.run(Main.java:164)
>>>> at org.apache.karaf.shell.console.Main.run(Main.java:79)
>>>> at com.redhat.gpe.hyla.tooling.HylaMain.main(HylaMain.java:34)
>>>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>> at
>>>> sun.reflect.NativeMethodAccessorImpl.invoke(
>>>> NativeMethodAccessorImpl.java:39)
>>>> at
>>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(
>>>> DelegatingMethodAccessorImpl.java:25)
>>>> at java.lang.reflect.Method.invoke(Method.java:597)
>>>> at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
>>>> Error executing command: java.lang.NullPointerException
>>>>
>>>> As this code is really hard to debug as we have embedded the code of
>>>> org.apache.felix.gogo.runtime
>>>> & org.apache.felix.gogo.commands in the jar of Karaf Shell Console, does
>>>> anybody knows why I could get a NPE when we call this method. In debug
>>>> mode, I confirm that the session object exists but the command is null
>>>> (even if I'm able to recuperate the args 'help echo' and this command
>>>> works
>>>> 'echo blabla'
>>>>
>>>> Regards,
>>>>
>>>>
>>>>  --
>>> Jean-Baptiste Onofré
>>> jbonofre@apache.org
>>> http://blog.nanthrax.net
>>> Talend - http://www.talend.com
>>>
>>>
>>
>>
>>
> --
> Jean-Baptiste Onofré
> jbonofre@apache.org
> http://blog.nanthrax.net
> Talend - http://www.talend.com
>



-- 
Charles Moulliard
Apache Committer / Architect @RedHat
Twitter : @cmoulliard | Blog :  http://cmoulliard.github.io

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