[JSF/EJB3 stateless] NullPointerException
Bonjour !
Je débute pas mal dans l'utilisation des EJB3 et je me heurte à un problème lors de l'appel d'un managedBean qui exécute une action d'un stateless. J'ai fait volontairement un sessionBean sans accès à une BDD pour bien épurer au maximum le code et les projets mais je ne trouve toujours pas ce qui cloche.
Alors voilà quelques parties du code qui vont peut être pouvoir vous aider à me répondre :
l'EJB stateless :
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package stateless;
import javax.ejb.Stateless;
/**
* Session Bean implementation class HelloWorldSessionBean
*/
@Stateless(mappedName = "hello")
public class HelloWorldSessionBean implements HelloWorldSessionBeanLocal {
/**
* Default constructor.
*/
public HelloWorldSessionBean() {
}
@Override
public String sayHello(String nom) {
String hello = "Hello World "+nom+" !";
return hello;
}
} |
Le managed bean :
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package managedBean;
import javax.ejb.EJB;
import stateless.HelloWorldSessionBeanLocal;
public class HelloWorldManagedBean {
@EJB(name="hello")
private HelloWorldSessionBeanLocal hello;
private String nom;
private String phrase;
public HelloWorldManagedBean() {
}
public String helloworld(){
phrase = hello.sayHello(nom);
return "hello";
}
public String getPhrase() {
return phrase;
}
public void setPhrase(String phrase) {
this.phrase = phrase;
}
public HelloWorldSessionBeanLocal getHello() {
return hello;
}
public void setHello(HelloWorldSessionBeanLocal hello) {
this.hello = hello;
}
public String getNom() {
return nom;
}
public void setNom(String nom) {
this.nom = nom;
}
} |
le faces-config.xml
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<?xml version="1.0" encoding="UTF-8"?>
<faces-config
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"
version="1.2">
<managed-bean>
<managed-bean-name>hw</managed-bean-name>
<managed-bean-class>managedBean.HelloWorldManagedBean</managed-bean-class>
<managed-bean-scope>application</managed-bean-scope>
</managed-bean>
<navigation-rule>
<from-view-id>*</from-view-id>
<navigation-case>
<from-outcome>hello</from-outcome>
<to-view-id>/sayHello.jsp</to-view-id>
</navigation-case>
</navigation-rule>
</faces-config> |
et les deux jsf :
index.jsp
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<?xml version="1.0" encoding="ISO-8859-1" ?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" version="2.0">
<jsp:directive.page language="java"
contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" />
<jsp:text>
<![CDATA[ <?xml version="1.0" encoding="ISO-8859-1" ?> ]]>
</jsp:text>
<jsp:text>
<![CDATA[ <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> ]]>
</jsp:text>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Welcome</title>
</head>
<body>
<f:view>
<h:form>
<h:inputText value="#{hw.nom}" />
<h:commandButton action="#{hw.helloworld}" value="Coucou" />
</h:form>
</f:view>
</body>
</html>
</jsp:root> |
et le resultat :
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<?xml version="1.0" encoding="ISO-8859-1" ?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" version="2.0">
<jsp:directive.page language="java"
contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" />
<jsp:text>
<![CDATA[ <?xml version="1.0" encoding="ISO-8859-1" ?> ]]>
</jsp:text>
<jsp:text>
<![CDATA[ <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> ]]>
</jsp:text>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Result</title>
</head>
<body>
<f:view>
<h:form>
<h:outputText value="#{hw.phrase}" />
</h:form>
</f:view>
</body>
</html>
</jsp:root> |
Et donc l'erreur :
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2009-08-27 16:35:14,216 : ActionListenerImpl.processAction : java.lang.NullPointerException
javax.faces.el.EvaluationException: java.lang.NullPointerException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:387)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:458)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:763)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.ow2.jonas.web.tomcat6.CheckOpenResourcesValve.invoke(CheckOpenResourcesValve.java:73)
at org.ow2.jonas.web.tomcat6.tx.TransactionValve.invoke(TransactionValve.java:90)
at org.ow2.jonas.web.tomcat6.ResetAuthenticationValve.invoke(ResetAuthenticationValve.java:95)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.ow2.jonas.web.tomcat6.versioning.CoyoteAdapterWithDelegatedContextSearch.service(CoyoteAdapterWithDelegatedContextSearch.java:300)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
at managedBean.HelloWorldManagedBean.helloworld(HelloWorldManagedBean.java:24)
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 org.apache.el.parser.AstValue.invoke(AstValue.java:172)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:68)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
... 23 more
2009-08-27 16:35:14,216 : InvokeApplicationPhase.execute : #{hw.helloworld}: java.lang.NullPointerException
javax.faces.FacesException: #{hw.helloworld}: java.lang.NullPointerException
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
at javax.faces.component.UICommand.broadcast(UICommand.java:387)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:458)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:763)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.ow2.jonas.web.tomcat6.CheckOpenResourcesValve.invoke(CheckOpenResourcesValve.java:73)
at org.ow2.jonas.web.tomcat6.tx.TransactionValve.invoke(TransactionValve.java:90)
at org.ow2.jonas.web.tomcat6.ResetAuthenticationValve.invoke(ResetAuthenticationValve.java:95)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.ow2.jonas.web.tomcat6.versioning.CoyoteAdapterWithDelegatedContextSearch.service(CoyoteAdapterWithDelegatedContextSearch.java:300)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
... 22 more
Caused by: java.lang.NullPointerException
at managedBean.HelloWorldManagedBean.helloworld(HelloWorldManagedBean.java:24)
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 org.apache.el.parser.AstValue.invoke(AstValue.java:172)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:68)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
... 23 more
2009-08-27 16:35:14,216 : Phase.doPhase : JSF1054: (Phase ID: INVOKE_APPLICATION 5, View ID: /) Exception thrown during phase execution: javax.faces.event.PhaseEvent[source=com.sun.faces.lifecycle.LifecycleImpl@cdc74]
2009-08-27 16:35:14,216 : StandardWrapperValve.invoke : Servlet.service() for servlet Faces Servlet threw exception
java.lang.NullPointerException
at managedBean.HelloWorldManagedBean.helloworld(HelloWorldManagedBean.java:24)
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 org.apache.el.parser.AstValue.invoke(AstValue.java:172)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:68)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:387)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:458)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:763)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.ow2.jonas.web.tomcat6.CheckOpenResourcesValve.invoke(CheckOpenResourcesValve.java:73)
at org.ow2.jonas.web.tomcat6.tx.TransactionValve.invoke(TransactionValve.java:90)
at org.ow2.jonas.web.tomcat6.ResetAuthenticationValve.invoke(ResetAuthenticationValve.java:95)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.ow2.jonas.web.tomcat6.versioning.CoyoteAdapterWithDelegatedContextSearch.service(CoyoteAdapterWithDelegatedContextSearch.java:300)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619) |
J'ai vu beaucoup de tuto sur le sujet et suivi toutes les étapes mais rien n'y fait, je tombe toujours sur ce nullpointerexception donc si quelqun peut m'aider, je lui en serait grandement reconnaissant ! :)
