[Building Sakai] getting DAO instance

[KetanNale]

I am getting following stacktrace while calling any method of my AapTool from
page 

PersonManagerImpl is my DAOImpl

2009-04-10 19:03:41,281 ERROR http-8080-Processor24
com.sun.faces.application.ApplicationImpl - Managedbean PersonTool could
not be created Can't instantiate class:
'org.sakaiproject.component.app.person.PersonManagerImpl at 248f34'.
javax.faces.FacesException: Can't instantiate class:
'org.sakaiproject.component.app.person.PersonManagerImpl at 248f34'.
        at
com.sun.faces.config.ManagedBeanFactory.getConvertedValueConsideringPrimitives(ManagedBeanFactory.java:869)
        at
com.sun.faces.config.ManagedBeanFactory.setPropertiesIntoBean(ManagedBeanFactory.java:555)
        at
com.sun.faces.config.ManagedBeanFactory.newInstance(ManagedBeanFactory.java:233)
        at
com.sun.faces.application.ApplicationAssociate.createAndMaybeStoreManagedBeans(ApplicationAssociate.java:256)
        at
com.sun.faces.el.VariableResolverImpl.resolveVariable(VariableResolverImpl.java:78)
        at
org.sakaiproject.jsf.app.SakaiVariableResolver.resolveVariable(SakaiVariableResolver.java:76)
        at com.sun.faces.el.impl.NamedValue.evaluate(NamedValue.java:125)
        at
com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:243)
        at
com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:173)
        at
com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)
        at
com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:123)
        at
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:72)
        at javax.faces.component.UICommand.broadcast(UICommand.java:312)
        at
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:267)
        at
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:381)
        at
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:75)
        at
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
        at
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        at
org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:561)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679)
        at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461)
        at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:399)
        at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
        at org.sakaiproject.jsf.util.JsfTool.dispatch(JsfTool.java:221)
        at org.sakaiproject.jsf.util.JsfTool.doPost(JsfTool.java:256)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        at
org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:561)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679)
        at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461)
        at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:364)
        at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
        at
org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:475)
        at
org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1250)
        at
org.sakaiproject.portal.charon.handlers.ToolHandler.doTool(ToolHandler.java:188)
        at
org.sakaiproject.portal.charon.handlers.ToolHandler.doGet(ToolHandler.java:93)
        at
org.sakaiproject.portal.charon.handlers.ToolHandler.doPost(ToolHandler.java:70)
        at
org.sakaiproject.portal.charon.SkinnableCharonPortal.doPost(SkinnableCharonPortal.java:1093)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        at
org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:613)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
        at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)

        at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
        at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
        at java.lang.Thread.run(Thread.java:595)
2009-04-10 19:03:41,281 ERROR http-8080-Processor24
com.sun.faces.lifecycle.InvokeApplicationPhase - #{PersonTool.processAdd}
: javax.faces.el.EvaluationException: javax.faces.FacesException:
javax.faces.FacesException: Can't instantiate class: 'org.s
akaiproject.component.app.person.PersonManagerImpl at 248f34'.
javax.faces.FacesException: #{PersonTool.processAdd}:
javax.faces.el.EvaluationException: javax.faces.FacesException: javax.f
aces.FacesException: Can't instantiate class:
'org.sakaiproject.component.app.person.PersonManagerImpl at 248f34'.
        at
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:78)
        at javax.faces.component.UICommand.broadcast(UICommand.java:312)
        at
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:267)
        at
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:381)
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