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PONullPointerException Error when trying to get a value from Another Bean in JSF
 

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  1. PONullPointerException Error when trying to get a value from Another Bean in JSF
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    <p>I've two backing beans:</p> <ul> <li><code>Login</code>: a bean that validates the user login info (username and password) with database table.</li> <li><code>Buss_Services</code>: another bean that performs some business services.</li> </ul> <p>I need to get the user ID from the <code>Login</code> bean and use it inside the <code>Buss_Services</code>. It's stored in a String property of <code>Login</code> and the <code>Buss_Services</code> needs this value to track the currently logged-in user and update the DB.</p> <p>Here's the <code>Login</code> backing bean:</p> <pre><code>@ManagedBean(name="Login") @SessionScoped public class Login { private String loggedUserID; public Object logCB_action() { try { // ... rs = stmt.executeQuery(SQL); while (rs.next()) { if (rs.getString("USER_NAME").equals(uname)) { if (rs.getString("USER_PW").equals(pword)) { // Here, the user ID is set. loggedUserID=rs.getString("USER_ID");// This line ... System.out.println("Logged User (ID): "+ userID); return ("displayApp"); } } } } // ... } public String getLoggedID() { // Here, the user ID is returned. String id = loggedUserID; return (id); } } </code></pre> <p>Here's the <code>Buss_Services</code> backing bean which calls the <code>getLoggedID()</code> method:</p> <pre><code>@ManagedBean(name="Buss_Services") @SessionScoped public class Buss_Services { @ManagedProperty("#{Login}") private Login login; public void newEst_action() { // The following line throws NullPointerException. System.out.println("Logged User (ID): " + login.getLoggedID()); } // Getters/setters. } </code></pre> <p>This is the stack trace which I get when I try to access the bussiness services page:</p> <pre><code>javax.faces.el.EvaluationException: //C:/Users/Sultan09/AppData/Roaming/JDeveloper/system11.1.2.0.38.60.17/o.j2ee/drs/TheOCES/OCES.ViewControllerWebApp.war/App_Business_SerivesPG.jsf @68,140 action="#{backingBeanScope.App_BServPG_Bean.newEst_action}": java.lang.NullPointerException at org.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:51) at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) at org.apache.myfaces.trinidad.component.UIXCommand.broadcast(UIXCommand.java:190) at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:787) at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1252) at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._invokeApplication(LifecycleImpl.java:965) at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:346) at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:204) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:173) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:121) at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468) at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60) at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468) at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:293) at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199) at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111) at java.security.AccessController.doPrivileged(Native Method) at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313) at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413) at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94) at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161) at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209) at weblogic.work.ExecuteThread.run(ExecuteThread.java:178 Caused by: java.lang.NullPointerException at JavaView.backing.Buss_Services.newEst_action(Buss_Services.java:172) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.el.parser.AstValue.invoke(Unknown Source) at com.sun.el.MethodExpressionImpl.invoke(Unknown Source) at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105) at org.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:46) ... 44 more </code></pre> <p>How is this caused and how can I solve it?</p> <hr> <p><strong>UPDATE</strong> : As per comments here and personal search on similar issues to the one stated here, the Problem is Finally solved ,thank god. The solution was that I had to:</p> <ol> <li>add the <code>&lt;managed-property&gt;</code> of login to the adfc-config.xml file . </li> <li>more importantly , obtain the <code>loggedUserID</code> inside a <code>@PostConstruct</code> anotated method init() . Thanx everyone.</li> </ol>
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