Question Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object in Technology Q&A

CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

suwandi_cahyadi — Thu, 03 Mar 2022 08:49:30 GMT

Hi,

I have seen some blog post where people are using java.io.Reader in Groovy to read the body content. For example:

def body = message.getBody(java.io.Reader)<br>body.eachLine { line -><br>	.... Some code here     <br>}

But then if I try the same code, I get the following error message:

javax.script.ScriptException: java.lang.Exception: java.lang.NullPointerException: Cannot invoke method eachLine() on null object@ line 26 in script1.groovy, cause: java.lang.NullPointerException: Cannot invoke method eachLine() on null object

Is there something that I missed?

EDIT: I realized it is error if I used conversion XML to CSV before the script step. If I remove the conversion step this error does not occur.

Thank you.

Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

avinash_mallashetty_scpla — Thu, 03 Mar 2022 16:25:41 GMT

Hi Suwandi,

could you read the message body as string like below.

def body = message.getBody(java.lang.String)as String;

reg, avinash

Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

suwandi_cahyadi — Fri, 04 Mar 2022 03:27:01 GMT

Hi Avinash,

Yes, it is possible. But in this case I want to read line by line, which will make the transform operation easier.

Thank you.

Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

avinash_mallashetty_scpla — Fri, 04 Mar 2022 10:56:57 GMT

Hi Suwandi,

let us know your problem solved or new problem.

Warm regards, Avinash

Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

daviddasilva — Tue, 08 Mar 2022 10:26:34 GMT

Hi,

Could you share the blog post that you were following?

Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

suwandi_cahyadi — Thu, 10 Mar 2022 10:29:13 GMT

Hi,

Some samples are:

first sample

second sample

Thank you.

Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

Muniyappan — Fri, 11 Mar 2022 11:44:55 GMT

Can you please give us the groovy code you used and input payload you sent?

Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

suwandi_cahyadi — Mon, 14 Mar 2022 05:15:58 GMT

Hi,

This is the groovy script:

import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;
def Message processData(Message message) {   
    //Body 
    def objReader = message.getBody(java.io.Reader);
    def array = []
    
    objReader.eachLine { String line ->
        array.add(line)
    }
   
    return message;    
}<br>

And this is the input payload:

"0047224526,449 ,0006429 ,LIV ,20210429092751"
"0047241670,449 ,0006429 ,LIV ,20210420092958"
"0047242774,437 ,0006429 ,LIV ,20210429101150"
"0047244164,321 ,0006429 ,LIV ,20210420093320" <br>

Error is at line 26: objReader.eachLine { String line ->

I realized it is error if I used conversion XML to CSV before the script step. If I remove the conversion step this error does not occur.

Thank you.

Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

Muniyappan — Tue, 15 Mar 2022 11:15:59 GMT

Well. I have tried to run the code with given input. I dont see issue with this.

import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;
def Message processData(Message message) {   
    //Body 
    def objReader = message.getBody(java.io.Reader);
    def array = []
    
    objReader.eachLine { String line ->
        array.add(line)
    }
   
    return message;    
}

input

"0047224526,449 ,0006429 ,LIV ,20210429092751"
"0047241670,449 ,0006429 ,LIV ,20210420092958"
"0047242774,437 ,0006429 ,LIV ,20210429101150"
"0047244164,321 ,0006429 ,LIV ,20210420093320" <br>

Re: CPI: Groovy - java.io.Reader error: Cannot invoke method eachLine() on null object

shivaprasad1 — Tue, 06 Sep 2022 09:50:33 GMT

Hi Suwandi,

Is there any way that you have figured out the issue?

I am also facing the same issue

Please let me know if you find any solution

Thanks

Shiva