[jboss-user] [JBoss jBPM] - MYSQL database connection within JBoss application(using JSF

[ccelgun]

I hope i am writing this question into the correct place.
I am trying to make an application with JBoss. I have to establish connection with MYSQL database.I found some articles about how to connect to MYSQL database and i believe that i did everything correct.
But this error message is shown on the web browser after i ran the program.

Exception :
javax.servlet.ServletException : Cannot get value for expression '#{homeBean.taskInstances}'
javax.faces.webapp.FacesServlet.service(FacesServlet.java:109)
org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:55)
org.jbpm.web.JbpmContextFilter.doFilter(JbpmContextFilter.java:83)
org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:59)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)

root cause:
javax.faces.facesException: Cannot get value for expression '#{homeBean.taskInstances}'
org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:421)
org.apache.myfaces.application.jsp.JspViewhandlerImpl.renderView(JspViewHandlerImpl.java:234)
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300)
javax.faces.webapp.FacesServlet.service(facesServlet.java:95)
<brZorg.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:55)
org.jbpm.web.JbpmContextFilter.doFilter(JbpmContextFilter.java:83)
org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:59)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)

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