The file you are using as input cannot be found. Check if you are using a valid file.
The file not found exception occurred in the logs.
I would suggest to implement logger in the java action to trace the issue.
This looks like you are trying to read a file called “NewPDF”. Does this file exist? The error message suggests it doesn’t.
I suspect you actually want to read from an existing Mendix FileDocument. To do this take a look at the getFileDocumentContent method in the Core API.
I hope this helps.
If you are still stuck on this problem it may help to deploy your application to Eclipse and try debugging in Eclipse. I have found that it sometimes offers additional information in the logs.
Hope that helps.