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Date: Sun, 11 Oct 2015 11:42:37 -0500
From: Andrew Block <andy.block@gmail.com>
To: Bhuvan Gupta <bhuvangu@gmail.com>
Cc: users@camel.apache.org
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Subject: Re: why adding a processor after unmarshaling in apache camel
 throw nullpointer
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The Gson library will unmarshal an object to specified type if it is prov=
ided, otherwise it will return a LinkedHashMap of the objects that it was=
 able to unmarshal. The getBody() in the processor has no direct connecti=
on to the previously unmarshaled object the object type must be specified=
 in the unmarshal component.=C2=A0

- Andy

--=C2=A0
Andrew Block

On October 11, 2015 at 5:27:19 AM, Bhuvan Gupta (bhuvangu=40gmail.com) wr=
ote:

It worked once i changes to=C2=A0
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0unmarshal().json(JsonLibr=
ary.Gson, MyTest.class)

So basically while unmarshalling we have to provide the Type to convert t=
o, we just cant except it to change json string to a type specified in ge=
tBody(..) method.. =C2=A0 this is the reason... . right =3F

I will update the stackoverflow once i get the correct explaination.

Thanks
Bhuvan

On Sun, Oct 11, 2015 at 3:46 PM, Bhuvan Gupta <bhuvangu=40gmail.com> wrot=
e:
I changed the processor code to=C2=A0
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Object body=
 =3D exchange.getIn().getBody();
System.out.println(=22class: =22+body.getClass());=C2=A0
System.out.println(=22as string:=22 + body);

and it printed :

class: class com.google.gson.internal.LinkedTreeMap
as string:=7Ba=3Dthis is a, b=3Dthis is b, c=3D=7B=7D=7D

What is happening... not able to create a mind map of what is happening.

Cheers
Bhuvan

On Sun, Oct 11, 2015 at 8:21 AM, Andrew Block <andy.block=40gmail.com> wr=
ote:
In your processor, since you are requesting the object contained in the m=
essage body as a particular type, it is possible for the value to be null=
 if that is not the type that is actually on the body. Would you be able =
to verify the object type after the unmarshall.=3F You can do this in you=
r processor by getting the Object on the message without a type (message.=
getIn().getBody() and checking the type.=C2=A0

- Andy


--=C2=A0
Andrew Block

On October 10, 2015 at 3:46:52 PM, Bhuvan Gupta (bhuvangu=40gmail.com) wr=
ote:

Hello,

I setup the camel routes shown below:
In stage folder i can see message getting marshal properly into a json.
but while un-marshaling on this line body.setA(=22modified A=22);
i get a null pointer exception basically body is null.. *Why* =3F

StackOverflow question link:
http://stackoverflow.com/questions/33058563/adding-a-processor-after-unma=
rshaling-in-apache-camel

from(=22direct:stage=22).marshal().json(JsonLibrary.Gson).to(=22file://st=
age=22);

from(=22file://stage=22).unmarshal().json(JsonLibrary.Gson).process(new
Processor() =7B
=40Override
public void process(Exchange exchange) throws Exception =7B
MyTest body =3D exchange.getIn().getBody(MyTest.class);
body.setA(=22modified A=22);
=7D=7D).to(=22direct:b=22);


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