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java.lang.NullPointerException: 	at org.apache.xml.security.keys.keyresolver.implementations.X509CertificateResolver.engineResolveX509Certificate(X509CertificateResolver.java:149)	at org.apache.xml.security.keys.keyresolver.KeyResolver.resolveX509Certificate(KeyResolver.java:239)	at org.apache.xml.security.keys.KeyInfo.getX509CertificateFromStaticResolvers(KeyInfo.java:900)	at org.apache.xml.security.keys.KeyInfo.getX509Certificate(KeyInfo.java:859)	at provgw.adapter.security.X509SecurityInterceptor.validateSignature(X509SecurityInterceptor.java:190)	at provgw.adapter.security.X509CallbackSimSecurityInterceptor.invoke(X509CallbackSimSecurityInterceptor.java:89)	at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)	at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)	at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)	at org.apache.axis.server.AxisServer.invoke(AxisServer.java:239)	at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:699)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)	at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)	at java.lang.Thread.run(Unknown Source)