i'm trying to run the following example  and i'm getting NullPointerException 

http://trailblazer.demo.jboss.com/EJB3Trail/serviceobjects/sfsb/





HTTP Status 500 - 

--------------------------------------------------------------------------------

type Exception report

message 

description The server encountered an internal error () that prevented it from 
fulfilling this request.

exception 

org.apache.jasper.JasperException: Exception in JSP: /my-apps/calculator.jsp:70

67:  
68:  Past results
69:  <%
70:  int entries = cal.getStarts().size();
71:  %>
72:  
73:  


Stacktrace:
        
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
        
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
        
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        java.lang.reflect.Method.invoke(Method.java:585)
        org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
        java.security.AccessController.doPrivileged(Native Method)
        javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
        org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275)
        
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
        java.security.AccessController.doPrivileged(Native Method)
        
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        sun.reflect.GeneratedMethodAccessor88.invoke(Unknown Source)
        
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        java.lang.reflect.Method.invoke(Method.java:585)
        org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
        java.security.AccessController.doPrivileged(Native Method)
        javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
        org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275)
        
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:217)


root cause 

java.lang.NullPointerException
        
org.apache.jsp.my_002dapps.calculator_jsp._jspService(calculator_jsp.java:127)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
        
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        java.lang.reflect.Method.invoke(Method.java:585)
        org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
        java.security.AccessController.doPrivileged(Native Method)
        javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
        org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275)
        
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
        java.security.AccessController.doPrivileged(Native Method)
        
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        sun.reflect.GeneratedMethodAccessor88.invoke(Unknown Source)
        
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        java.lang.reflect.Method.invoke(Method.java:585)
        org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
        java.security.AccessController.doPrivileged(Native Method)
        javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
        org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275)
        
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:217)


note The full stack trace of the root cause is available in the Apache 
Tomcat/5.5.17 logs.


--------------------------------------------------------------------------------

Apache Tomcat/5.5.17

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