Why is JBoss logging a "javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated" exception when handling HTTPS requests?

Issue

Why is JBoss logging a "javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated" exception when handling HTTPS requests?

15:36:22,150 DEBUG [org.apache.tomcat.util] (http-/127.0.0.1:8443-1) Error getting client certs: javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated
    at sun.security.ssl.SSLSessionImpl.getPeerCertificates(SSLSessionImpl.java:397) [jsse.jar:1.7.0_45]
    at org.apache.tomcat.util.net.jsse.JSSESupport.getX509Certificates(JSSESupport.java:93) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.tomcat.util.net.jsse.JSSESupport.getPeerCertificateChain(JSSESupport.java:147) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:1038) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.coyote.Request.action(Request.java:362) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.catalina.connector.Request.getAttribute(Request.java:1113) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.catalina.connector.Request.getAttributeNames(Request.java:1167) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.catalina.connector.RequestFacade.getAttributeNames(RequestFacade.java:278) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.jsp.forbidden_jsp._jspService(forbidden_jsp.java:59)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:69) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-1.jar:1.0.2.Final-redhat-1]
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:365) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:309) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:242) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-1.jar:1.0.2.Final-redhat-1]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.3.4.Final-redhat-1.jar:7.3.4.Final-redhat-1]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.3.2.Final-redhat-1.jar:7.3.2.Final-redhat-1]
    at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_45]