Details
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Bug
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Status: Resolved
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Major
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Resolution: Fixed
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None
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None
Description
Took some time to figure this one out, but the javax.enterprise.inject.spi.CDI integration point will return a bean manager of another webapp, when the current webapp doesn't have CDI enabled.
This in turn will mess with JSF as it uses that integration point to detect whether CDI is enabled or not. The end result is that TomEE hasn't started CDI for the webapp, but JSF thinks it's available.
To reproduce:
1) Download apps.zip from here, it contains 2 webapps as maven projects
2) Package and deploy the "deploy-first" webapp to TomEE 7.0.1
3) Package and deploy the "BeanManager_bug" webapp to TomEE 7.0.1
4) Access $SERVER_URL/BeanManager_bug/, notice the NullPointerException
5) Access $SERVER_URL/BeanManager_bug/test, notice the "helloworld" bean among the CDI beans, it's from the "deploy-first" webapp.
I believe the problem is that MyFaces AbstractFacesInitializer#initCDIIntegration calls the mentioned CDI.current().getBeanManager(), which should fail, but actually will return "deploy-first" bean manager because of the fallback algorithm in ThreadSingletonServiceImpl#get(final ClassLoader cl), which returns the WebBeansContext with the most beans in it.
So for the "BeanManager_bug" webapp JSF thinks it has CDI, but actually doesn't, which means it will use the CDIManagedBeanHandlerImpl instead of the DefaultViewScopeHandler, causing the NPE as a symptom.
Just for reference, here's the NPE from accessing $SERVER_URL/BeanManager_bug/:
java.lang.NullPointerException org.apache.webbeans.web.context.WebContextsService.lazyStartSessionContext(WebContextsService.java:815) org.apache.webbeans.web.context.WebContextsService.getSessionContext(WebContextsService.java:739) org.apache.webbeans.web.context.WebContextsService.getCurrentContext(WebContextsService.java:277) org.apache.webbeans.container.BeanManagerImpl.getContext(BeanManagerImpl.java:287) org.apache.webbeans.intercept.NormalScopedBeanInterceptorHandler.getContextualInstance(NormalScopedBeanInterceptorHandler.java:88) org.apache.webbeans.intercept.SessionScopedBeanInterceptorHandler.getContextualInstance(SessionScopedBeanInterceptorHandler.java:76) org.apache.webbeans.intercept.NormalScopedBeanInterceptorHandler.get(NormalScopedBeanInterceptorHandler.java:70) org.apache.myfaces.cdi.view.ViewScopeBeanHolder$$OwbNormalScopeProxy0.generateUniqueViewScopeId(org/apache/myfaces/cdi/view/ViewScopeBeanHolder.java) org.apache.myfaces.cdi.impl.CDIManagedBeanHandlerImpl.generateViewScopeId(CDIManagedBeanHandlerImpl.java:92) org.apache.myfaces.view.ViewScopeProxyMap.getWrapped(ViewScopeProxyMap.java:79) org.apache.myfaces.view.ViewScopeProxyMap.get(ViewScopeProxyMap.java:119) org.apache.myfaces.config.ManagedBeanBuilder.getScope(ManagedBeanBuilder.java:564) org.apache.myfaces.config.ManagedBeanBuilder.getNarrowestScope(ManagedBeanBuilder.java:464) org.apache.myfaces.config.ManagedBeanBuilder.isInValidScope(ManagedBeanBuilder.java:435) org.apache.myfaces.config.ManagedBeanBuilder.initializeProperties(ManagedBeanBuilder.java:319) org.apache.myfaces.config.ManagedBeanBuilder.buildManagedBean(ManagedBeanBuilder.java:163) org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.createManagedBean(ManagedBeanResolver.java:333) org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.getValue(ManagedBeanResolver.java:296) javax.el.CompositeELResolver.getValue(CompositeELResolver.java:63) org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:179) org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:94) org.apache.el.parser.AstValue.getValue(AstValue.java:137) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184) org.apache.webbeans.el22.WrappedValueExpression.getValue(WrappedValueExpression.java:70) org.apache.myfaces.view.facelets.el.ContextAwareTagValueExpression.getValue(ContextAwareTagValueExpression.java:96) javax.faces.component._DeltaStateHelper.eval(_DeltaStateHelper.java:360) javax.faces.component.UIOutput.getValue(UIOutput.java:67) org.apache.myfaces.shared.renderkit.RendererUtils.getValue(RendererUtils.java:486) org.apache.myfaces.shared.renderkit.RendererUtils.getStringValue(RendererUtils.java:329) org.apache.myfaces.shared.renderkit.html.HtmlTextRendererBase.renderOutput(HtmlTextRendererBase.java:86) org.apache.myfaces.shared.renderkit.html.HtmlTextRendererBase.encodeEnd(HtmlTextRendererBase.java:73) javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:674) javax.faces.component.UIComponentBase.encodeAll(UIComponentBase.java:554) javax.faces.component.UIComponentBase.encodeAll(UIComponentBase.java:550) org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(FaceletViewDeclarationLanguage.java:1891) org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:313) javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:58) org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:116) org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:267) javax.faces.webapp.FacesServlet.service(FacesServlet.java:200) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.apache.openejb.server.httpd.EEFilter.doFilter(EEFilter.java:65)