MBeanServer is not available

[Frank Truong]

Hi,

I am using Tomcat 6.0.20 with admin console part added seperately. When trying to add DataSource via admin console, I run into the following exception:

javax.servlet.ServletException: javax.servlet.jsp.JspException: MBeanServer is not available
	org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862)
	org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
	admin.resources.listDataSources_jsp._jspService(listDataSources_jsp.java:457)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
	org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
	org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.apache.webapp.admin.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:123)

Could you give me some pointers where I should look at in order to pass this bumper?

Thanks a lot.
Frank