When exporting an Adhoc Report it gives an internal server error - jasperserver

When trying to export an report from the adhoc editor to any format it loads for a while, and then gives an "Internal Server Error".
The report has approx. 15.000 rows. But some are filled with large chunks of text.
Any ideas on how to solve this ?
I also looked at the logs but they aren't showing anything. The only thing i get in the browser is
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, root#localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
The jasperserver.log and the catalina.out do not show any error stacktraces.
It looks like i'm getting a timeout ?

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