Usage of Pub java classes in 10.11

Hello,

I tried to use a java class from package WmPub in 10.11 after an update to the new version.
In our previous Version 10.5 it works quite well. With any doubts.

[…]
import pub.CommonUtils;
[…]

[…]

//Return sessionKey
CommonUtils.mergeOutput(dataCursor, sessionKey, sessionKey);

[…]

The complier says:
[…]
The source was saved, but was not compiled due to the following errors:

/opt/softwareag111/IntegrationServer/instances/default/packages/Default/code/source/test.java:21: error: package pub does not exist
import pub.CommonUtils;
^
1 error
[…]

Did anyone have a solution for that?

Cheers,
Nils