JspException: Exception thrown by getter for property XXX of bean YYY?

[Viggio, Alex]

We've had some additions to our production Struts app out for two months,
and today is the first time I have seen this specific error (see below).
I've includded the getter method below. How could an exception be thrown by
this method? It should handle the case where previousUrl is null.

Thanks,
- Alex

*** code ***

    public String getPreviousUrl() {
        return ((null != previousUrl) ? "<a href=\"" + previousUrl +
"\">&#171;</a>" : "&#171;");
    }

*** stack ***

javax.servlet.jsp.JspException: Exception thrown by getter for property
calendar.previousUrl of bean meetingWizardForm
        at org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:513)
        at
org.apache.struts.taglib.bean.WriteTag.doStartTag(WriteTag.java:179)
        at
org.apache.struts.taglib.nested.bean.NestedWriteTag.doStartTag(NestedWriteTa
g.java:93)
        at
_0002fmeetingWizardTimes_0002ejspmeetingWizardTimes_jsp_3._jspService(_0002f
meetingWizardTimes_0002ejspmeetingWizardTimes_jsp_3.java:709)
        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
com.cfer.servlet.ChainControllerServlet.serviceChain(ChainControllerServlet.
java:201)
        at
com.cfer.servlet.ChainControllerServlet.service(ChainControllerServlet.java:
143)
        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.facade.RequestDispatcherImpl.doForward(RequestDispatcherIm
pl.java:222)
        at
org.apache.tomcat.facade.RequestDispatcherImpl.forward(RequestDispatcherImpl
.java:162)
        at
org.apache.struts.action.ActionServlet.processActionForward(ActionServlet.ja
va:1759)
        at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1596)
        at
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
com.cfer.servlet.ChainControllerServlet.serviceChain(ChainControllerServlet.
java:201)
        at
com.cfer.servlet.ChainControllerServlet.service(ChainControllerServlet.java:
143)
        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:81
2)
        at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
        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)

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