# Dynamic feeders - help!

**URL:** <https://community.gatling.io/t/dynamic-feeders-help/5938>\
**Category:** Gatling (Open-Source)\
**Created:** [December 16, 2020, 7:02pm UTC](https://community.gatling.io/t/dynamic-feeders-help/5938 "2020-12-16T19:02:16Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Sharanya\_Krishnamoor](https://avatars.discourse-cdn.com/v4/letter/s/3ec8ea/32.png) [@Sharanya\_Krishnamoor](https://community.gatling.io/u/Sharanya_Krishnamoor)\
**Post date:** [December 16, 2020, 7:02pm UTC](https://community.gatling.io/t/dynamic-feeders-help/5938/1 "2020-12-16T19:02:16Z")

</div>

I have a method that generates data and writes to a csv file in before method

val outputFile = new BufferedWriter(new FileWriter(“src/test/resources/primarycompany.csv”))

val csvWriter = new CSVWriter(outputFile, ‘\n’, CSVWriter.NO\_QUOTE\_CHARACTER)

before{  
createContact()  
}

def createContact(): Unit = {  
var noOfContacts: Int = 3  
listOfRecords += csvSchema  
for (i ← 0 until noOfContacts) {  
api.data = new JSONObject  
api.setContacts()  
response = api.createContact(path, 201)  
ContactID = response.path(ContactsEnum.mcr\_contact\_id.keys)  
primaryContactIDList.add(ContactID.toString)  
}  
try{  
listOfRecords += GetStringArray(primaryContactIDList)  
csvWriter.writeAll(listOfRecords.toList)  
}  
finally{  
csvWriter.close()  
}  
}

As seen above am writing the values to primarycompany.csv

I wanted to use this file as feeder but " **Feeder source is empty"** though it has values in it.

Help pls!

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**Author:** ![sbrevet](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/sbrevet/32/830_2.png) [@sbrevet](https://community.gatling.io/u/sbrevet)\
**Post date:** [December 17, 2020, 4:51pm UTC](https://community.gatling.io/t/dynamic-feeders-help/5938/2 "2020-12-17T16:51:34Z")

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Hello,

First, `before` hook is run after the initialization and “before” the actual simulation (see [the lifecycle](https://gatling.io/docs/current/general/simulation_structure/#hooks)).

The feeder is initialized before the `before` hook and then has already check that the source is empty or not.

Solution: you should use the `batch` [loading mode](https://gatling.io/docs/current/session/feeder/#loading-mode)

But, sadly, we had an issue with this loading mode, and we fix in the next release.  
You’ll find the fix in Gatling 3.5.0 (release in progress)

Sébastien,

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<div class="post-metadata">

**Author:** ![Sharanya\_Krishnamoor](https://avatars.discourse-cdn.com/v4/letter/s/3ec8ea/32.png) [@Sharanya\_Krishnamoor](https://community.gatling.io/u/Sharanya_Krishnamoor)\
**Post date:** [December 17, 2020, 8:47pm UTC](https://community.gatling.io/t/dynamic-feeders-help/5938/3 "2020-12-17T20:47:31Z")

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Great! Thank you.