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Posted to user@storm.apache.org by "zhonghongfei@yy.com" <zh...@yy.com> on 2014/10/22 12:05:27 UTC

Must a inner class be serialized to emit ?

for example:

public Class A implements Serializable  {
Class B{
....
}
}

my question is if B should implements Serializable to be transfer to another component ?

Re: Re: Must a inner class be serialized to emit ?

Posted by "zhonghongfei@yy.com" <zh...@yy.com>.

Thank you.
I my class A, it has a reference to B.
When A is emitted to next bolt, I found that when I access B, it's null.
So I think it's neccesory to implement serializable for B.

From: Dan DeCapria, CivicScience
Date: 2014-10-22 22:27
To: user
Subject: Re: Must a inner class be serialized to emit ?
I believe you need to implement Serializable for both classes. For example, I use:

public class A implements Serializable {
     public static class B implements Serializable {
          public B() {/*default constructor required*/}

          @Override
          public String toString() { /*stuff*/}
          @Override
          public boolean equals(Object obj) {/*stuff*/}
          @Override
          public int hashCode() {/*stuff*/}
     }

}

Hope this helps, -Dan 

On Wed, Oct 22, 2014 at 7:06 AM, Samit Sasan <sa...@gmail.com> wrote:

My guess is only if Class A holds a reference to an object of Class B, otherwise its fine.

-Samit

On Wed, Oct 22, 2014 at 3:35 PM, zhonghongfei@yy.com <zh...@yy.com> wrote:

for example:

public Class A implements Serializable  {
Class B{
....
}
}

my question is if B should implements Serializable to be transfer to another component ?

-- 

Dan DeCapria
CivicScience, Inc.

Back-End Data IS/BI/DM/ML Specialist

Re: Must a inner class be serialized to emit ?

Posted by "Dan DeCapria, CivicScience" <da...@civicscience.com>.

I believe you need to implement Serializable for both classes. For example,
I use:

public class A implements Serializable {
     public static class B implements Serializable {
          public B() {/*default constructor required*/}
          @Override
          public String toString() { /*stuff*/}
          @Override
          public boolean equals(Object obj) {/*stuff*/}
          @Override
          public int hashCode() {/*stuff*/}
     }
}

Hope this helps, -Dan


On Wed, Oct 22, 2014 at 7:06 AM, Samit Sasan <sa...@gmail.com> wrote:

> My guess is only if Class A holds a reference to an object of Class B,
> otherwise its fine.
>
> -Samit
>
> On Wed, Oct 22, 2014 at 3:35 PM, zhonghongfei@yy.com <zh...@yy.com>
> wrote:
>
>>  for example:
>>
>> public Class A implements Serializable  {
>> Class B{
>> ....
>> }
>> }
>>
>> my question is if B should implements Serializable to be transfer to
>> another component ?
>>
>
>


-- 
Dan DeCapria
CivicScience, Inc.
Back-End Data IS/BI/DM/ML Specialist

Re: Must a inner class be serialized to emit ?

Posted by Samit Sasan <sa...@gmail.com>.

My guess is only if Class A holds a reference to an object of Class B,
otherwise its fine.

-Samit

On Wed, Oct 22, 2014 at 3:35 PM, zhonghongfei@yy.com <zh...@yy.com>
wrote:

>  for example:
>
> public Class A implements Serializable  {
> Class B{
> ....
> }
> }
>
> my question is if B should implements Serializable to be transfer to
> another component ?
>