The Best Way To Fix The Error Is By Getting A Bean Property Of Type Java.lang.nullpointerException

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    If your computer encounters an error getting ownership of a bean like java.lang.nullpointerexception, read these troubleshooting tips.

    • Login : The bean with which the user’s login information (username and password) is validated against the database table.
    • Buss_Services : Another service that experts say provides business services to Bin.

    I would like to get a user ID that was generated by the Login component and is valid in Buss_Services . It is registered with a string property including Login , and Buss_Services needs this value to track the currently logged in customer and to update the database.

    error getting property from bean of type java.lang.nullpointerexception

      @ManagedBean (name = "Connection")@SessionScopedEnter the public classroom    ID of the user connected to the private channel;    public object logCB_action ()        To attempt            // ...           Rs = stmt.executeQuery(SQL);            while (rs. next ()) if (rs.getString ("USER_NAME"). equals (uname))                    also if (rs.getString ("USER_PW"). equals (pword))                     // This is where the user ID is defined.                    logindUserID = rs.getString ("USER_ID"); // This line ...                    System.out.println ("User (ID):" + user ID);                        return ("displayApp");                                                                // ...                public string getLoggedID ()       // Here we can say that the user ID is being returned.        The ID string is the same as the LogUserID;        return (identifier);     

    Why do I get NullPointerException in thread main?

    Exception in the whole “main” thread java.lang.NullPointerException The fact that you are getting this error is probably because we are trying to target the length () operation to str1, which is null. A simple improvement is to add that you are just testing str1 like below:

      @ManagedBean (name = "Buss_Services")@SessionScopedpublic class Buss_Services   @ManagedProperty ("# ​​Login")    separate connection connection;    Client is invalid newEst_action ()        // The next line throws a NullPointerException.        System.out.println ("User (ID): +" login.getLoggedID ());        // getter / installer. 

    Here is a record of how much I get when I try to access the trading companies page:

      javax.faces.el.EvaluationException://C:/Users/Sultan09/AppData/Roaming/JDeveloper/system11. @ 68,140BS action = "# backing_Bervean_App_App_App_AppApp_App_App_App_App PG .PG newEst_action ": java.lang.NullPointerExceptionat org.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke ( com.sun.faces.application.ActionListenerImpl.processAction ( org.apache.myfaces.trinidad.component.UIXCommand.broadcast ( javax.faces.component.UIViewRoot.broadcastEvents ( javax.faces.component.UIViewRoot.processApplication ( oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._invokeApplication ( oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase ( oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute ( javax.faces.webapp.FacesServlet.service ( weblogic.servlet.internal.StubSecurityHelper $ ( weblogic.servlet.internal.StubSecurityHelper.invokeServlet ( weblogic.servlet.internal.ServletStubImpl.execute ( weblogic.servlet.internal.TailFilter.doFilter ( weblogic.servlet.internal.FilterChainImpl.doFilter ( oracle.adf.model.servlet.ADFBindingFilter.doFilter ( weblogic.servlet.internal.FilterChainImpl.doFilter ( ( org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl $ FilterListChain.doFilter ( oracle.adfternal.view.faces.activedata.AdsFilter.doFilter ( org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl $ FilterListChain.doFilter ( org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl ( org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter ( org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter ( weblogic.servlet.internal.FilterChainImpl.doFilter ( $ 1. execute ( (native method)at ( ( ( ( ( weblogic.servlet.internal.FilterChainImpl.doFilter ( oracle.dms.servlet.DMSServletFilter.doFilter ( weblogic.servlet.internal.FilterChainImpl.doFilter ( weblogic.servlet.internal.RequestEventsFilter.doFilter ( weblogic.servlet.internal.FilterChainImpl.doFilter ( weblogic.servlet.internal.WebAppServletContext $ ServletInvocationAction.wrapRun ( weblogic.servlet.internal.WebAppServletContext $ ( ( ( weblogic.servlet.internal.WebAppServletContext.securedExecute ( weblogic.servlet.internal.WebAppServletContext.execute ( ( ( ( Caused by: java.lang.NullPointerException    at JavaView.backing.Buss_Services.newEst_action (    at sun.reflect.NativeMethodAccessorImpl.invoke0 (native method)   At sun.reflect.NativeMethodAccessorImpl.invoke (    found in sun.reflect.DelegatingMethodAccessorImpl.invoke ( 25)   at java.lang.reflect.Method.invoke (    during com.sun.el.parser.AstValue.invoke (source unknown)    found at com.sun.el.MethodExpressionImpl.invoke (source unknown)    each com.sun.faces.fbracelets.el.TagMethodExpression.invoke (    org at.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke (    ... 44 more 

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  • UPDATE:With every comment here and every personal quest for problems like the one described here, the problem is finally solved, thank goodness.In turn, the solution was:

    1. add should have used with a login in adfc-config.xml.
    2. More importantly, you end up with an internal loguserid init () method annotated with @PostConstruct . Thanks to all.

    error getting property from bean of type java.lang.nullpointerexception

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    Fout Bij Het Ophalen Van Eigendom Van Bean Van Het Type Java.lang.nullpointerexception
    Erro Ao Obter Propriedade Do Bean Do Tipo Java.lang.nullpointerexception
    Fehler Beim Abrufen Der Eigenschaft Von Bean Vom Typ Java.lang.nullpointerException
    Erreur Lors De L’obtention De La Propriété Du Bean De Type Java.lang.nullpointerexception
    Error Al Obtener La Propiedad De Un Bean De Tipo Java.lang.nullpointerexception
    Fel Vid Hämtning Av Egendom Från Bean Of Type Java.lang.nullpointerexception
    Ошибка при получении свойства из компонента типа Java.lang.nullpointerexception
    Java.lang.nullpointerexception 유형의 Bean에서 속성을 가져오는 중 오류 발생
    Błąd Podczas Pobierania Właściwości Z Fasoli Typu Java.lang.nullpointerexception
    Errore Durante L’acquisizione Della Proprietà Dal Bean Di Tipo Java.lang.nullpointerexception