# Classloading issues running flowable 6.4.0 on Karaf

**URL:** <https://forum.flowable.org/t/classloading-issues-running-flowable-6-4-0-on-karaf/2964>\
**Category:** Flowable Engine\
**Created:** [November 29, 2018, 8:43am UTC](https://forum.flowable.org/t/classloading-issues-running-flowable-6-4-0-on-karaf/2964 "2018-11-29T08:43:23Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![donkon](https://avatars.discourse-cdn.com/v4/letter/d/f475e1/32.png) [@donkon](https://forum.flowable.org/u/donkon)\
**Post date:** [December 12, 2018, 1:56pm UTC](https://forum.flowable.org/t/classloading-issues-running-flowable-6-4-0-on-karaf/2964/10 "2018-12-12T13:56:26Z")

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yes, it fails with

```
Caused by: java.lang.NullPointerException
	at java.io.Reader.<init>(Reader.java:78)
	at java.io.InputStreamReader.<init>(InputStreamReader.java:72)
	at org.flowable.common.engine.impl.AbstractEngineConfiguration.initSqlSessionFactory(AbstractEngineConfiguration.java:659)

```

I updated my sample project with disableIdmEngine=true, could you pull my changes and check, why we have different behaviour? (I also added a H2 Datasource, see changes in README.md)

Regards, Björn

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