hello all, 
 
    i need help in using the <bean:define> tag. I had first define a
bean to hold a String ArrayList which is to be used in a <html:select>
tag. however, this code fails to work and complains abt a
NullPointerException. And btw, can someone explains to me what's the
difference between scope and toScope? thanks
 
    <bean:define id="travelPeriodList" name="newsletterForm"
property="travelDaysList"/>
      <html:select property="targetDuration" size="0" value="">
       <html:options collection="travelPeriodList" property="value"
labelProperty="label"/>
        </html:select>
 
here's the exception:

java.lang.NullPointerException
 at java.util.Hashtable.put(Hashtable.java:380)
 at
org.apache.jasper.runtime.PageContextImpl.setAttribute(PageContextImpl.j
ava:252)
 at
org.apache.struts.taglib.bean.DefineTag.doStartTag(DefineTag.java:210)
 at
_jsps._admin._managenewsletters._newsletter_display_add_edit_jsp._jspSer
vice(_newsletter_display_add_edit_jsp.java:1453)
 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$JspServletWrapper.service(JspServle
t.java:247)
 at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.access$6(JspServl
et.java:237)
 at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:520)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:589)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at
com.iplanet.server.http.servlet.NSServletRunner.invokeServletService(NSS
ervletRunner.java:891)
 at
com.iplanet.server.http.servlet.WebApplication.service(WebApplication.ja
va:1064)
 at
com.iplanet.server.http.servlet.NSServletRunner.ServiceWebApp(NSServletR
unner.java:953)
 at
com.iplanet.server.http.servlet.NSServletSession.internalRedirect(Native
Method)
 at
com.iplanet.server.http.servlet.NSRequestDispatcher.include(NSRequestDis
patcher.java:93)
 at
org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:4
08)
 at org.apache.struts.taglib.template.GetTag.doStartTag(GetTag.java:189)
 at
_jsps._admin._templates._contentTemplate_jsp._jspService(_contentTemplat
e_jsp.java:237)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServle
t.java:247)

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