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HTTP Status 500 - The server encountered an internal error that prevented it from fulfilling this request.

Referente ao curso VRaptor e JPA: Pratique Java com um sistema completo

por Estudante
| 312.5k xp | 436 posts

Boa tarde pessoal!

Quando eu tento acessar a lista de usuários, gera o erro no browser:

HTTP Status 500 - 


type Exception report

message 

description The server encountered an internal error that prevented it from fulfilling this request.

exception
java.lang.NullPointerException
    br.com.alura.horas.controller.UsuarioController.lista(UsuarioController.java:44)
    br.com.alura.horas.controller.UsuarioController$Proxy$_$$_WeldClientProxy.lista(Unknown Source)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    net.vidageek.mirror.provider.java.PureJavaMethodReflectionProvider.invoke(PureJavaMethodReflectionProvider.java:38)
    net.vidageek.mirror.invoke.MethodHandlerByMethod.withArgs(MethodHandlerByMethod.java:54)
    br.com.caelum.vraptor.core.DefaultReflectionProvider.invoke(DefaultReflectionProvider.java:42)
    br.com.caelum.vraptor.core.DefaultReflectionProvider$Proxy$_$$_WeldClientProxy.invoke(Unknown Source)
    br.com.caelum.vraptor.observer.ExecuteMethod$1.call(ExecuteMethod.java:82)
    br.com.caelum.vraptor.observer.ExecuteMethod$1.call(ExecuteMethod.java:72)
    br.com.caelum.vraptor.core.Try.run(Try.java:18)
    br.com.caelum.vraptor.observer.ExecuteMethod.execute(ExecuteMethod.java:72)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:78)
    br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:98)
    br.com.caelum.vraptor.interceptor.FlashInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler$1.call(ToInstantiateInterceptorHandler.java:71)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler$1.call(ToInstantiateInterceptorHandler.java:68)
    br.com.caelum.vraptor.core.Try.run(Try.java:18)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.executeSafely(ToInstantiateInterceptorHandler.java:68)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:61)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:75)
    br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler$1.call(ToInstantiateInterceptorHandler.java:71)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler$1.call(ToInstantiateInterceptorHandler.java:68)
    br.com.caelum.vraptor.core.Try.run(Try.java:18)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.executeSafely(ToInstantiateInterceptorHandler.java:68)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:61)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.start(DefaultInterceptorStack.java:93)
    br.com.caelum.vraptor.core.DefaultInterceptorStack$Proxy$_$$_WeldClientProxy.start(Unknown Source)
    br.com.caelum.vraptor.observer.RequestHandlerObserver.handle(RequestHandlerObserver.java:93)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:123)

 note The full stack trace of the root cause is available in the Apache Tomcat/8.5.8 logs.

--------------------------------------------------------------------------------

Apache Tomcat/8.5.8

Gera o erro no console:

jan 25, 2017 5:02:15 PM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [default] in context with path [/alura-horas] threw exception
java.lang.NullPointerException
    at br.com.alura.horas.controller.UsuarioController.lista(UsuarioController.java:44)
    at br.com.alura.horas.controller.UsuarioController$Proxy$_$$_WeldClientProxy.lista(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at net.vidageek.mirror.provider.java.PureJavaMethodReflectionProvider.invoke(PureJavaMethodReflectionProvider.java:38)
    at net.vidageek.mirror.invoke.MethodHandlerByMethod.withArgs(MethodHandlerByMethod.java:54)
    at br.com.caelum.vraptor.core.DefaultReflectionProvider.invoke(DefaultReflectionProvider.java:42)
    at br.com.caelum.vraptor.core.DefaultReflectionProvider$Proxy$_$$_WeldClientProxy.invoke(Unknown Source)
    at br.com.caelum.vraptor.observer.ExecuteMethod$1.call(ExecuteMethod.java:82)
    at br.com.caelum.vraptor.observer.ExecuteMethod$1.call(ExecuteMethod.java:72)
    at br.com.caelum.vraptor.core.Try.run(Try.java:18)
    at br.com.caelum.vraptor.observer.ExecuteMethod.execute(ExecuteMethod.java:72)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    at org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    at org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    at org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    at org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    at org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:78)
    at br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:98)
    at br.com.caelum.vraptor.interceptor.FlashInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler$1.call(ToInstantiateInterceptorHandler.java:71)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler$1.call(ToInstantiateInterceptorHandler.java:68)
    at br.com.caelum.vraptor.core.Try.run(Try.java:18)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.executeSafely(ToInstantiateInterceptorHandler.java:68)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:61)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    at br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:75)
    at br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler$1.call(ToInstantiateInterceptorHandler.java:71)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler$1.call(ToInstantiateInterceptorHandler.java:68)
    at br.com.caelum.vraptor.core.Try.run(Try.java:18)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.executeSafely(ToInstantiateInterceptorHandler.java:68)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:61)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack.start(DefaultInterceptorStack.java:93)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack$Proxy$_$$_WeldClientProxy.start(Unknown Source)
    at br.com.caelum.vraptor.observer.RequestHandlerObserver.handle(RequestHandlerObserver.java:93)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    at org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    at org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    at org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    at org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    at org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    at br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:123)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
3 respostas
por Estudante
| 312.5k xp | 436 posts

No browser/console diz que o erro está na linha 44 do UsuarioController:


43        public void lista() {
44            List<Usuario> usuarios = usuarioDao.lista();
45            result.include("usuarios", usuarios);
46        }

Meu UsuarioDao:

    public List<Usuario> lista() {
        TypedQuery<Usuario> query = manager.createQuery("Select u from Usuario u", Usuario.class);
        return query.getResultList();
    }
}
solução!
por Guilherme Romão
| 1195.3k xp | 1944 posts
Instrutor Software Engineer

Boa tarde Ewerton, você está instanciando o usuarioDao ou recebendo por injeção em algum momento? pois esse erro significa que não dá para chamar um método (no caso lista) em um objeto null(no caso usuarioDao)

Espero ter ajudado!

por Estudante
| 312.5k xp | 436 posts

Boa noite Guilherme!!

Cara era isso msm, eu esqueci de adicionar o @Inject no construtor do UsuarioController...

Muito obrigado pela ajuda!! Grande abraço!

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