OpenSAML user discussion

I am trying to parse a SAML token .
and decoding that token using Base64.decode(encodedSAMLXml);  
I Included all those Jar file in Tomcat 
xalan
xalan-2.6.0
xalan-2.7.1
xalan-2.7.1-serializer
I am getting the following error:
Please help me to resolve this excception. 


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: 
org.apache.xml.serializer.Encodings.isRecognizedEncoding(Ljava/lang/String;)Z
        
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:460)
        
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:355)
        
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)


root cause 

javax.servlet.ServletException: 
org.apache.xml.serializer.Encodings.isRecognizedEncoding(Ljava/lang/String;)Z
        
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:841)
        
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:774)
        
org.apache.jsp.service_005fprovider_jsp._jspService(service_005fprovider_jsp.java:175)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
        
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)


root cause 

java.lang.NoSuchMethodError: 
org.apache.xml.serializer.Encodings.isRecognizedEncoding(Ljava/lang/String;)Z
        
org.apache.xml.serializer.dom3.LSSerializerImpl.write(LSSerializerImpl.java:926)
        org.opensaml.xml.util.XMLHelper.writeNode(XMLHelper.java:834)
        org.opensaml.xml.util.XMLHelper.nodeToString(XMLHelper.java:789)
        org.opensaml.xml.XMLConfigurator.load(XMLConfigurator.java:141)
        org.opensaml.xml.XMLConfigurator.load(XMLConfigurator.java:125)
        
org.opensaml.DefaultBootstrap.initializeXMLTooling(DefaultBootstrap.java:135)
        org.opensaml.DefaultBootstrap.bootstrap(DefaultBootstrap.java:75)
        
org.apache.jsp.service_005fprovider_jsp._jspService(service_005fprovider_jsp.java:119)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
        
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)


note The full stack trace of the root cause is available in the Apache 
Tomcat/5.5.28 logs.


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Apache Tomcat/5.5.28