I have installed opensaml-1.1b and the installation is successful, but when I 
try to access the sample mywebapp explained here: 
http://www.ja-sig.org/wiki/display/CASC/JA-SIG+Java+Client+Simple+WebApp+Sample
I got again the NullPointerException. 
 
java.lang.NullPointerException    at 
org.jasig.cas.client.util.HttpServletRequestWrapperFilter$CasHttpServletRequestWrapper.getRemoteUser(HttpServletRequestWrapperFilter.java:80)
    at 
org.apache.jsp.include_005fheader_jsp._jspService(include_005fheader_jsp.java:46)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)    at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)    at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328) 
   at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)  
  at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)    at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)    at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
 
 
I have applied the patch into 
src/main/java/org/jasig/cas/client/util/HttpServletRequestWrapperFilter.java 
from cas client directory, and restart tomcat. Again, the same 
NullPointerException appears. What I'm doing wrong??
 
Do I have to install Xerces, or just taking the jars after unpacking it and 
placing them manually in mywebapp.war is sufficient? 
 
Any help, please? thanks in advance
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