Ado dot netconnection String with Access 2007

I am trying to connect with Access 2007 "accdb" file using ADO net using the following code, but i am getting the error Unrecognized Database format, What can be the possible reason for this?

        OleDbConnection conn = new 
        Data Source=C:/MyWorkers.accdb");


        catch (Exception ex)


You can use the Microsoft.ACE.OLEDB.12.0 provider, see available as part of the office 2007 system driver package.

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PDFbox Preflight PDF/A-1b check not working properly in java version 1.8

java pdf pdfbox pdfa

I am using PDFBOX Preflight to validate pdf document to check whether it is in PDF/A-1b format or not . It works perfectly on java 1.7 but when I run the code in java 1.8 i get following errors

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