Null PointerException when run with Apache/SSL/Tomcat

[Brett G. Palmer]

We are getting a NullPionterException which seems to originate from the the
struts-html tag libraries.  The error only occurs when we run Struts with
Tomcat/Apache and SSL.  If we bypass SSL and just go through Apache (port
80) we do not see the error.  Has anyone else seen this problem when running
Struts through SSL?  Any suggestions would be appreciated.  The error
message is shown below.

Thanks in advance for your help.

Brett

/******************** ERROR Message **************************/

Error: 500
Location: /mvelopes05/index.jsp
Internal Servlet Error:

javax.servlet.ServletException
        at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImp
l.java:459)
        at
_0002findex_0002ejspindex_jsp_1._jspService(_0002findex_0002ejspindex_jsp_1.
java:553)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.ja
va:130)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.ja
va:282)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
        at org.apache.tomcat.core.Handler.service(Handler.java:287)
        at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:79
7)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
        at
org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnection
(Ajp13ConnectionHandler.java:160)
        at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
        at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
        at java.lang.Thread.run(Thread.java:484)

Root cause:
java.lang.NullPointerException
        at org.apache.struts.taglib.html.LinkTag.hyperlink(LinkTag.java:492)
        at org.apache.struts.taglib.html.LinkTag.doStartTag(LinkTag.java:317)
        at
_0002findex_0002ejspindex_jsp_1._jspService(_0002findex_0002ejspindex_jsp_1.
java:145)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.ja
va:130)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.ja
va:282)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
        at org.apache.tomcat.core.Handler.service(Handler.java:287)
        at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:79
7)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
        at
org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnection
(Ajp13ConnectionHandler.java:160)
        at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
        at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
        at java.lang.Thread.run(Thread.java:484)