How to connect birth 3.7 with hibernate JPA

maty

We have a web proyect, using BIRT Reporting Runtime Component Version 3.7, and we're using Hibernate 3.2 (JPA implementation). We have been testing with empty reports, and it works.. but, when we try to read database records, using scriptlets and some own classes, we get this error:

java.lang.NullPointerException
at org.eclipse.birt.report.model.metadata.ExtensionManagerImpl.initialize(ExtensionManagerImpl.java:103)
at org.eclipse.birt.report.model.metadata.MetaDataDictionary.intializeExtension(MetaDataDictionary.java:1118)
at org.eclipse.birt.report.model.api.impl.DesignEngineImpl.initialize(DesignEngineImpl.java:99)
at org.eclipse.birt.report.model.api.impl.DesignEngineImpl.newSessionHandle(DesignEngineImpl.java:147)
at org.eclipse.birt.report.model.api.DesignEngine.newSessionHandle(DesignEngine.java:108)
at org.eclipse.birt.report.engine.parser.ReportParser.getDesignHandle(ReportParser.java:143)
at org.eclipse.birt.report.engine.api.impl.ReportEngineHelper.getReportDesignHandle(ReportEngineHelper.java:255)
at org.eclipse.birt.report.engine.api.impl.ReportEngineHelper.openReportDesign(ReportEngineHelper.java:274)
at org.eclipse.birt.report.engine.api.impl.ReportEngine.openReportDesign(ReportEngine.java:601)
at org.eclipse.birt.report.service.ReportEngineService.openReportDesign(ReportEngineService.java:387)
at org.eclipse.birt.report.utility.BirtUtility.getRunnableFromDesignFile(BirtUtility.java:607)
at org.eclipse.birt.report.context.ViewerAttributeBean.getDesignHandle(ViewerAttributeBean.java:641)
at org.eclipse.birt.report.context.ViewerAttributeBean.__init(ViewerAttributeBean.java:224)
at org.eclipse.birt.report.context.BaseAttributeBean.init(BaseAttributeBean.java:233)
at org.eclipse.birt.report.context.ViewerAttributeBean.<init>(ViewerAttributeBean.java:118)
at org.eclipse.birt.report.context.BirtContext.__init(BirtContext.java:44)
at org.eclipse.birt.report.context.BaseContext.<init>(BaseContext.java:69)
at org.eclipse.birt.report.context.BirtContext.<init>(BirtContext.java:30)
at org.eclipse.birt.report.servlet.ViewerServlet.__getContext(ViewerServlet.java:150)
at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.doGet(BirtSoapMessageDispatcherServlet.java:151)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.service(BirtSoapMessageDispatcherServlet.java:122)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.eclipse.birt.report.filter.ViewerFilter.doFilter(ViewerFilter.java:68)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:680)

Any advice? we will really apreciate your help!

Thanks in advance!