# Trying to use 3rd party java libraries: error unpacking while loading designer

**URL:** <https://forum.inductiveautomation.com/t/trying-to-use-3rd-party-java-libraries-error-unpacking-while-loading-designer/18354>\
**Category:** Ignition\
**Tags:** ignition79\
**Created:** [June 8, 2018, 7:42am UTC](https://forum.inductiveautomation.com/t/trying-to-use-3rd-party-java-libraries-error-unpacking-while-loading-designer/18354 "2018-06-08T07:42:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pgmo](https://avatars.discourse-cdn.com/v4/letter/p/d07c76/32.png) [@pgmo](https://forum.inductiveautomation.com/u/pgmo)\
**Post date:** [June 8, 2018, 7:42am UTC](https://forum.inductiveautomation.com/t/trying-to-use-3rd-party-java-libraries-error-unpacking-while-loading-designer/18354/1 "2018-06-08T07:42:57Z")

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I’d like to integrate this library [https://poi.apache.org/](https://poi.apache.org/) in my project to read/write Excel files. I copied the following library files and dependencies  
 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/2/241f2574103d4cfeca3c1a6e0750d84d3f11abec.png)  
into the **lib\core\common** Ignition path, together with the pack200 processed files  
 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/2/20c135e9b118270d7dbe84b7601cc4561e3955e7.png)

The gateway starts with no error. But when I try to start the designer, I get this error message  
 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/f/f42a28e7eb6cb730b522c93fcf53571b7fb985f7.png)

and the Java Console reports the following exception

 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/f/f4f177a8f00bd81b8dbc1d9d6c983e02c8e84f3f.png)

Any suggestion?

Thanks in advance, regards

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<div class="post-metadata">

**Author:** ![pgmo](https://avatars.discourse-cdn.com/v4/letter/p/d07c76/32.png) [@pgmo](https://forum.inductiveautomation.com/u/pgmo)\
**Post date:** [June 8, 2018, 8:29am UTC](https://forum.inductiveautomation.com/t/trying-to-use-3rd-party-java-libraries-error-unpacking-while-loading-designer/18354/2 "2018-06-08T08:29:29Z")

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After googling around I found that `xmlbeans-2.6.0.jar` has an issue and that is **duplicated entries**!  
Applying what’s suggested here [https://stackoverflow.com/a/27649282/1737538](https://stackoverflow.com/a/27649282/1737538) solved the issue.  
Many thanks to Daniel!