[JasperReports 3.7.6 and Hibernate 3.6 Errors]

I am using JasperReports in my application - where I am using Spring, Hibernate and JasperReports.  I have just updated our version of Hibernate from 3.2.7 to 3.6 and JasperReports from 3.1.3 to 3.7.6.  However, I am not getting a NoClassDefFoundError (see below) without any indication of what class is missing. 

 java.lang.NoClassDefFoundError
    at net.sf.jasperreports.engine.query.JRHibernateQueryExecuterFactory.createQueryExecuter(JRHibernateQueryExecuterFactory.java:135)
    at net.sf.jasperreports.engine.fill.JRFillDataset.createQueryDatasource(JRFillDataset.java:681)
    at net.sf.jasperreports.engine.fill.JRFillDataset.initDatasource(JRFillDataset.java:605)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.setParameters(JRBaseFiller.java:1281)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:901)
    at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:118)
    at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:435)
    at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:398)

This exception is thrown when I make a call to JasperRunManager.runReportToPdfStream:

        try {
            JasperRunManager.runReportToPdfStream(reportFormatInputStream,
                    servletOutputStream, parameters);
        } catch (JRException e) {
            e.printStackTrace();
        }

 

This was working before I made my upgrades.  Does anyone have any insight on the issue that I am running into?