本文介绍了JSF 2.x @EJB依赖注入错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
因此，正如通常在编程中所做的那样，我问了一个问题和一个潜在的解决方案导致了更多的问题（和错误。）我是新手使用servlet，JSF和EJB并且遇到了依赖注入的错误。
So, as it usually goes in programming, I asked one question and a potential solution led to more questions (and bugs.) I'm new to using servlets, JSF, and EJBs and have run into an error with dependency injection.
这是我原来的问题：
我被告知我需要问一个新问题，粘贴我的托管bean代码和注入错误导致的堆栈跟踪。任何帮助将不胜感激。
I was told I needed to ask a new question, pasting my managed bean code and the stack trace that resulted from the injection error. Any help would be greatly appreciated.
ManagedBean
ManagedBean
@ManagedBean(name ="draftSavvyController")
@RequestScoped
public class DraftSavvyController
{
// ======================================
// = Attributes =
// ======================================
@EJB
private DraftSavvyBean draftBean;
private Person person;
private String name;
private String password;
private String userType;
private String searchTerm;
private static final String apiKey = "4765b95b1bb4ca5248261b7b9af443db";
// ======================================
// = Public Methods =
// ======================================
public String doRegisterUser()
{
draftBean.registerUser(name, password, userType);
return "chooseBeers.xhtml";
}
public String doCheckForUser()
{
if(draftBean.checkForUser(name, password))
{
return "chooseBeers.xhtml";
}
else return "loginerror.xhtml";
}
public String searchForBeers() throws MalformedURLException, IOException, JSONException
{
draftBean.searchForBeers(searchTerm, apiKey);
return "displaybeers.js";
}
Stack Trace
Stack Trace
com.sun.faces.mgbean.ManagedBeanCreationException: An error occurred performing resource injection on managed bean draftSavvyController
at com.sun.faces.mgbean.BeanBuilder.injectResources(BeanBuilder.java:211)
at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:103)
at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:103)
at com.sun.el.parser.AstValue.getValue(AstValue.java:179)
at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:224)
at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
at javax.faces.component.UIOutput.getValue(UIOutput.java:169)
at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1757)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:662)
Caused by: com.sun.faces.spi.InjectionProviderException: com.sun.enterprise.container.common.spi.util.InjectionException: Exception attempting to inject Remote ejb-ref name=com.draftsavvy.frontend.DraftSavvyController/draftBean,Remote 3.x interface =com.draftsavvy.frontend.DraftSavvyBean,ejb-link=null,lookup=,mappedName=,jndi-name=com.draftsavvy.frontend.DraftSavvyBean,refType=Session into class com.draftsavvy.frontend.DraftSavvyController: Lookup failed for 'java:comp/env/com.draftsavvy.frontend.DraftSavvyController/draftBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming}
at org.glassfish.faces.integration.GlassFishInjectionProvider.inject(GlassFishInjectionProvider.java:194)
at com.sun.faces.mgbean.BeanBuilder.injectResources(BeanBuilder.java:205)
... 56 more
Caused by: com.sun.enterprise.container.common.spi.util.InjectionException: Exception attempting to inject Remote ejb-ref name=com.draftsavvy.frontend.DraftSavvyController/draftBean,Remote 3.x interface =com.draftsavvy.frontend.DraftSavvyBean,ejb-link=null,lookup=,mappedName=,jndi-name=com.draftsavvy.frontend.DraftSavvyBean,refType=Session into class com.draftsavvy.frontend.DraftSavvyController: Lookup failed for 'java:comp/env/com.draftsavvy.frontend.DraftSavvyController/draftBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming}
at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl._inject(InjectionManagerImpl.java:703)
at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl.inject(InjectionManagerImpl.java:470)
at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl.injectInstance(InjectionManagerImpl.java:171)
at org.glassfish.faces.integration.GlassFishInjectionProvider.inject(GlassFishInjectionProvider.java:184)
... 57 more
Caused by: javax.naming.NamingException: Lookup failed for 'java:comp/env/com.draftsavvy.frontend.DraftSavvyController/draftBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=com.draftsavvy.frontend.DraftSavvyController/draftBean,Remote 3.x interface =com.draftsavvy.frontend.DraftSavvyBean,ejb-link=null,lookup=,mappedName=,jndi-name=com.draftsavvy.frontend.DraftSavvyBean,refType=Session' . Actual (possibly internal) Remote JNDI name used for lookup is 'com.draftsavvy.frontend.DraftSavvyBean#com.draftsavvy.frontend.DraftSavvyBean' [Root exception is javax.naming.NamingException: Lookup failed for 'com.draftsavvy.frontend.DraftSavvyBean#com.draftsavvy.frontend.DraftSavvyBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: com.draftsavvy.frontend.DraftSavvyBean#com.draftsavvy.frontend.DraftSavvyBean not found]]]
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:518)
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:455)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl._inject(InjectionManagerImpl.java:599)
... 60 more
Caused by: javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=com.draftsavvy.frontend.DraftSavvyController/draftBean,Remote 3.x interface =com.draftsavvy.frontend.DraftSavvyBean,ejb-link=null,lookup=,mappedName=,jndi-name=com.draftsavvy.frontend.DraftSavvyBean,refType=Session' . Actual (possibly internal) Remote JNDI name used for lookup is 'com.draftsavvy.frontend.DraftSavvyBean#com.draftsavvy.frontend.DraftSavvyBean' [Root exception is javax.naming.NamingException: Lookup failed for 'com.draftsavvy.frontend.DraftSavvyBean#com.draftsavvy.frontend.DraftSavvyBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: com.draftsavvy.frontend.DraftSavvyBean#com.draftsavvy.frontend.DraftSavvyBean not found]]
at com.sun.ejb.EjbNamingReferenceManagerImpl.resolveEjbReference(EjbNamingReferenceManagerImpl.java:191)
at com.sun.enterprise.container.common.impl.ComponentEnvManagerImpl$EjbReferenceProxy.create(ComponentEnvManagerImpl.java:1109)
at com.sun.enterprise.naming.impl.GlassfishNamingManagerImpl.lookup(GlassfishNamingManagerImpl.java:776)
at com.sun.enterprise.naming.impl.GlassfishNamingManagerImpl.lookup(GlassfishNamingManagerImpl.java:744)
at com.sun.enterprise.naming.impl.JavaURLContext.lookup(JavaURLContext.java:169)
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:498)
... 64 more
Caused by: javax.naming.NamingException: Lookup failed for 'com.draftsavvy.frontend.DraftSavvyBean#com.draftsavvy.frontend.DraftSavvyBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: com.draftsavvy.frontend.DraftSavvyBean#com.draftsavvy.frontend.DraftSavvyBean not found]
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:518)
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:455)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at com.sun.ejb.EjbNamingReferenceManagerImpl.resolveEjbReference(EjbNamingReferenceManagerImpl.java:186)
... 69 more
Caused by: javax.naming.NameNotFoundException: com.draftsavvy.frontend.DraftSavvyBean#com.draftsavvy.frontend.DraftSavvyBean not found
at com.sun.enterprise.naming.impl.TransientContext.doLookup(TransientContext.java:248)
at com.sun.enterprise.naming.impl.TransientContext.lookup(TransientContext.java:215)
at com.sun.enterprise.naming.impl.SerialContextProviderImpl.lookup(SerialContextProviderImpl.java:77)
at com.sun.enterprise.naming.impl.LocalSerialContextProviderImpl.lookup(LocalSerialContextProviderImpl.java:119)
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:505)
... 73 more
无国籍豆
@Stateless
public class DraftSavvyBean implements DraftSavvyBeanRemote {
// ======================================
// = Attributes =
// ======================================
@PersistenceContext(unitName = "DraftSavvyFrontEndPU")
private EntityManager em;
// ======================================
// = Public Methods =
// ======================================
public void registerUser(String username, String password, String userType)
{
//code here
}
public boolean checkForUser(String username, String password)
{
//code here
}
public void searchForBeers(String searchTerm, String apiKey) throws MalformedURLException, IOException, JSONException
{
//code here
}
}
推荐答案
正如Petr Mensik所说，您可能不需要远程EJB（除非您计划从不同的服务器调用该ejb的方法）。您可以使用 @Local 界面，甚至根本不使用界面。只需声明bean @Stateless并删除实现DraftSavvyBeanRemote 。
As Petr Mensik said, you probably don't need a remote EJB (unless you plan to call methods of that ejb from a different server). You can use a @Local interface, or even not interface at all. just declare the bean @Stateless and remove the implements DraftSavvyBeanRemote .
如果你使用接口（本地或远程），你必须注入接口的引用，而不是bean。所以你的注入应该是这样的。
If you do use an interface (either local or remote) you have to inject a reference to the interface, not to the bean. So your inject should look like this.
@EJB
private DraftSavvyBeanRemote draftBean;
这篇关于JSF 2.x @EJB依赖注入错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！