# Flowable Service Task IO Error - Stack trace

**URL:** <https://forum.flowable.org/t/flowable-service-task-io-error-stack-trace/8234>\
**Category:** Flowable Designer\
**Created:** [August 9, 2021, 7:07pm UTC](https://forum.flowable.org/t/flowable-service-task-io-error-stack-trace/8234 "2021-08-09T19:07:46Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![johannvj](https://avatars.discourse-cdn.com/v4/letter/j/eb8c5e/32.png) [@johannvj](https://forum.flowable.org/u/johannvj)\
**Post date:** [August 9, 2021, 7:07pm UTC](https://forum.flowable.org/t/flowable-service-task-io-error-stack-trace/8234/1 "2021-08-09T19:07:46Z")

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I am new to flowable. I create a very basic flow with one service task.  
Call a rest service.

When I execute I get an IO error.  
Where can I get details of this eror / the stack trace of this IO error

 ![io excpetion](https://canada1.discourse-cdn.com/flex035/uploads/flowable/original/2X/3/3a2fb7fc525e07884a806fe881b5f809977e485c.jpeg)

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**Author:** ![filiphr](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.flowable.org/filiphr/32/315_2.png) [@filiphr](https://forum.flowable.org/u/filiphr)\
**Post date:** [August 11, 2021, 12:50pm UTC](https://forum.flowable.org/t/flowable-service-task-io-error-stack-trace/8234/2 "2021-08-11T12:50:29Z")

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Hey @johannvj,

In order to be able to help you out we would need to see the stacktrace. Can you please share it?

Cheers,  
Filip

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<div class="post-metadata">

**Author:** ![johannvj](https://avatars.discourse-cdn.com/v4/letter/j/eb8c5e/32.png) [@johannvj](https://forum.flowable.org/u/johannvj)\
**Post date:** [August 12, 2021, 9:22pm UTC](https://forum.flowable.org/t/flowable-service-task-io-error-stack-trace/8234/3 "2021-08-12T21:22:06Z")

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Thanks Filip. I don’t know how to generate / find the stack trace… sweat\_smile:

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<div class="post-metadata">

**Author:** ![johannvj](https://avatars.discourse-cdn.com/v4/letter/j/eb8c5e/32.png) [@johannvj](https://forum.flowable.org/u/johannvj)\
**Post date:** [August 20, 2021, 9:38am UTC](https://forum.flowable.org/t/flowable-service-task-io-error-stack-trace/8234/4 "2021-08-20T09:38:38Z")

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Where can I access the stack trace?

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<div class="post-metadata">

**Author:** ![filiphr](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.flowable.org/filiphr/32/315_2.png) [@filiphr](https://forum.flowable.org/u/filiphr)\
**Post date:** [August 23, 2021, 3:06pm UTC](https://forum.flowable.org/t/flowable-service-task-io-error-stack-trace/8234/5 "2021-08-23T15:06:25Z")

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> [@johannvj](#):
>
> Thanks Filip. I don’t know how to generate / find the stack trace… sweat\_smile:

Well you’ll need to do the steps that lead you to have that error.

> [@johannvj](#):
>
> Where can I access the stack trace?

You should be able to see it the log of the application. I don’t know how you are running the application. If you are running it in a tomcat then you should be able to see it in the `catalina.out`.

Cheers,  
Filip