I hope i am writing this question into the correct place. <br>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. <br>But this error message is shown on the web browser after i ran the program. <br><br>Exception : <br>javax.servlet.ServletException : Cannot get value for expression '#{homeBean.taskInstances}' <br>javax.faces.webapp.FacesServlet.service(FacesServlet.java:109) <br>org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:55) <br>org.jbpm.web.JbpmContextFilter.doFilter(JbpmContextFilter.java:83) <br>org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:59) <br>org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81) <br><br>root cause: <br>javax.faces.facesException: Cannot get value for expression '#{homeBean.taskInstances}' <br>org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:421) <br>org.apache.myfaces.application.jsp.JspViewhandlerImpl.renderView(JspViewHandlerImpl.java:234) <br>org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300) <br>javax.faces.webapp.FacesServlet.service(facesServlet.java:95) &lt;brZorg.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:55) <br>org.jbpm.web.JbpmContextFilter.doFilter(JbpmContextFilter.java:83) <br>org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:59) <br>org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81) -- View this message in context: http://www.nabble.com/MYSQL-database-connection-within-JBoss-application%... Sent from the JBoss - Dev forum at Nabble.com.