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java.lang.NullPointerException: 	at java.io.Writer.write(Writer.java:157)	at org.apache.jsp.viewcertificate_jsp._jspService(viewcertificate_jsp.java:1055)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:402)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:346)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)	at org.owasp.filters.ContentSecurityPolicyFilter.doFilter(ContentSecurityPolicyFilter.java:198)	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)	at org.owasp.filters.ClickjackFilter.doFilter(ClickjackFilter.java:36)	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)	at org.ejbca.ui.web.admin.ProxiedAuthenticationFilter.doFilter(ProxiedAuthenticationFilter.java:109)	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)	at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)	at io.undertow.jsp.JspFileHandler.handleRequest(JspFileHandler.java:32)	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)	at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)	at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51)	at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)	at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)	at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:56)	at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)	at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)	at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)	at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284)	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174)	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)