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Posted to user@giraph.apache.org by Inci Cetindil <ic...@gmail.com> on 2011/12/06 00:59:23 UTC
NullWritable causes IllegalAccessException
I was trying to use NullWritable as the type of my edge values. But it causes an IllegalAccessException when BspUtils.createEdgeValue() method tries to instantiate it; since NullWritable is Singleton with a private constructor. Is there a way to use NullWritable, or do I need to use another Writable?
Thanks,
Inci
Re: NullWritable causes IllegalAccessException
Posted by Avery Ching <ac...@apache.org>.
Seems fairly reasonable. =)
Avery
On 12/6/11 12:31 PM, Jake Mannix wrote:
> We could special-case NullWritable, and if that class is put into the
> conf, instantiate it separately. Seems like a common case if a user
> wants to ignore something.
>
> -jake
>
> On Mon, Dec 5, 2011 at 4:29 PM, Avery Ching <aching@apache.org
> <ma...@apache.org>> wrote:
>
> Actually, isn't that because the default constructor is private?
> You probably need to write your own or subclass NullWritable with
> a public default constructor.
>
> Avery
>
>
> On 12/5/11 3:59 PM, Inci Cetindil wrote:
>
> I was trying to use NullWritable as the type of my edge
> values. But it causes an IllegalAccessException when
> BspUtils.createEdgeValue() method tries to instantiate it;
> since NullWritable is Singleton with a private constructor. Is
> there a way to use NullWritable, or do I need to use another
> Writable?
>
> Thanks,
> Inci
>
>
>
Re: NullWritable causes IllegalAccessException
Posted by Jake Mannix <ja...@gmail.com>.
We could special-case NullWritable, and if that class is put into the conf,
instantiate it separately. Seems like a common case if a user wants to
ignore something.
-jake
On Mon, Dec 5, 2011 at 4:29 PM, Avery Ching <ac...@apache.org> wrote:
> Actually, isn't that because the default constructor is private? You
> probably need to write your own or subclass NullWritable with a public
> default constructor.
>
> Avery
>
>
> On 12/5/11 3:59 PM, Inci Cetindil wrote:
>
>> I was trying to use NullWritable as the type of my edge values. But it
>> causes an IllegalAccessException when BspUtils.createEdgeValue() method
>> tries to instantiate it; since NullWritable is Singleton with a private
>> constructor. Is there a way to use NullWritable, or do I need to use
>> another Writable?
>>
>> Thanks,
>> Inci
>>
>
>
Re: NullWritable causes IllegalAccessException
Posted by Avery Ching <ac...@apache.org>.
Actually, isn't that because the default constructor is private? You
probably need to write your own or subclass NullWritable with a public
default constructor.
Avery
On 12/5/11 3:59 PM, Inci Cetindil wrote:
> I was trying to use NullWritable as the type of my edge values. But it causes an IllegalAccessException when BspUtils.createEdgeValue() method tries to instantiate it; since NullWritable is Singleton with a private constructor. Is there a way to use NullWritable, or do I need to use another Writable?
>
> Thanks,
> Inci