# Using external jar files with existing Flowable apps

**URL:** <https://forum.flowable.org/t/using-external-jar-files-with-existing-flowable-apps/3881>\
**Category:** Flowable Engine\
**Created:** [May 14, 2019, 10:42am UTC](https://forum.flowable.org/t/using-external-jar-files-with-existing-flowable-apps/3881 "2019-05-14T10:42:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pahujadeepanshu](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.flowable.org/pahujadeepanshu/32/837_2.png) [@pahujadeepanshu](https://forum.flowable.org/u/pahujadeepanshu)\
**Post date:** [May 14, 2019, 10:42am UTC](https://forum.flowable.org/t/using-external-jar-files-with-existing-flowable-apps/3881/1 "2019-05-14T10:42:13Z")

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Hi,

I have a requirement to use some TaskHandlers and ExecutionHandlers which are written by me but I want to use these with existing flowable-rest/modeler apps. I do not want to change the apps or create new one.

Is there a way I can specify my jar file while starting flowable-rest as a spring boot application?  
It will be really a great help

Thanks,  
Deepanshu