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The private key is null
com.sun.identity.saml.xmlsig.XMLSignatureException: The private key is null	at com.sun.identity.saml.xmlsig.AMSignatureProvider.signXML(AMSignatureProvider.java:264)	at com.sun.identity.saml.xmlsig.AMSignatureProvider.signXML(AMSignatureProvider.java:231)	at com.sun.identity.saml.xmlsig.XMLSignatureManager.signXML(XMLSignatureManager.java:137)	at com.sun.identity.saml.protocol.Response.signXML(Response.java:84)	at com.ssos.topic.web.PublishAction.perform(PublishAction.java:165)	at com.ssos.topic.web.PSServletController.processRequest(PSServletController.java:78)	at com.ssos.topic.web.PSServletController.doGet(PSServletController.java:180)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:450)	at org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:180)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)	at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)	at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)	at java.security.AccessController.doPrivileged(Native Method)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)	at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)