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java.lang.NullPointerException: null	at java.util.Calendar.setTime(Calendar.java:1770)	at eu.europa.ec.markt.dss.signature.pdf.pdfbox.PdfBoxSignatureService.createSignatureDictionary(PdfBoxSignatureService.java:225)	at eu.europa.ec.markt.dss.signature.pdf.pdfbox.PdfBoxSignatureService.digest(PdfBoxSignatureService.java:91)	at eu.europa.ec.markt.dss.signature.pdf.pdfbox.PdfBoxDocTimeStampService.timestamp(PdfBoxDocTimeStampService.java:58)	at eu.europa.ec.markt.dss.signature.pades.PAdESLevelBaselineLT.extendSignatures(PAdESLevelBaselineLT.java:167)	at eu.europa.ec.markt.dss.signature.pades.PAdESLevelBaselineLTA.extendSignatures(PAdESLevelBaselineLTA.java:67)	at eu.europa.ec.markt.dss.signature.pades.PAdESService.extendDocument(PAdESService.java:177)	at eu.europa.ec.markt.dss.ws.impl.SignatureServiceImpl.extendSignature(SignatureServiceImpl.java:412)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:188)	at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:104)	at org.apache.cxf.jaxws.AbstractJAXWSMethodInvoker.invoke(AbstractJAXWSMethodInvoker.java:237)	at org.apache.cxf.jaxws.JAXWSMethodInvoker.invoke(JAXWSMethodInvoker.java:69)	at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:75)	at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37)	at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:107)	at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:272)	at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)	at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:241)	at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:248)	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:222)	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:153)	at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:171)	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:286)	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:206)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:643)	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:262)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	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.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:620)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)	at java.lang.Thread.run(Thread.java:745)