1 Reply Latest reply on Jul 15, 2008 5:39 PM by Pete Muir

    Possible bug (NPE) with @Factory methods and null for Page Scoped variables (2.0.3.CR1)

    Vivian Steller Newbie

      Good morning,


      I'm not sure but I think I found a bug regarding the behavior of @Factory methods: outjecting null to the page context leads to an NullPointerException.


      Consider this code:


      @Name("courseFactory")
      @Scope(APPLICATION)
      public class CourseFactory {
      
          @Factory(value = COURSE, autoCreate = true, scope = PAGE)
          public Course loadCourse() {
              ...
              return null;       
          }
      
      }
      



      When asking for #{course} in a facelets page, a NPE is thrown. See the stack trace below.


      However, not using a @Factory method with return value works without any exception:


      @Name("courseFactory")
      @Scope(APPLICATION)
      public class CourseFactory {
      
          @Out(scope = PAGE, required = false)
          private Course course;
      
          @Factory(value = COURSE, autoCreate = true)
          public void loadCourse() {
              ...
              course = null;
          }
      
      }
      



      In my opinion both types of @Factory notations should behave the same, right?
      Maybe this bug is also related to JBSEAM-81?


      Thanks for any comments.



      Here is the stack trace:


      06:12:50,977 ERROR [STDERR] 15.07.2008 06:12:50 com.sun.facelets.FaceletViewHandler handleRenderException
      SCHWERWIEGEND: Error Rendering View[/teaching/lecture.xhtml]
      java.lang.NullPointerException
           at javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:1602)
           at javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:1496)
           at org.jboss.seam.contexts.PageContext.set(PageContext.java:97)
           at org.jboss.seam.Component.handleFactoryMethodResult(Component.java:1948)
           at org.jboss.seam.Component.getInstanceFromFactory(Component.java:1930)
           at org.jboss.seam.Component.getInstance(Component.java:1866)
           at org.jboss.seam.Component.getInstance(Component.java:1843)
           at org.jboss.seam.Component.getInstanceInAllNamespaces(Component.java:2192)
           at org.jboss.seam.Component.getValueToInject(Component.java:2144)
           at org.jboss.seam.Component.injectAttributes(Component.java:1601)
           at org.jboss.seam.Component.inject(Component.java:1419)
           at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:45)
           at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
           at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
           at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
           at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
           at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:166)
           at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:102)
           at de.uniulm.zsp.factory.LectureFactory_$$_javassist_5.loadLecture(LectureFactory_$$_javassist_5.java)
           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:585)
           at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
           at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:125)
           at org.jboss.seam.Component.callComponentMethod(Component.java:2092)
           at org.jboss.seam.Component.getInstanceFromFactory(Component.java:1929)
           at org.jboss.seam.Component.getInstance(Component.java:1866)
           at org.jboss.seam.Component.getInstance(Component.java:1843)
           at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55)
           at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50)
           at org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:166)
           at org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:53)
           at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
           at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
           at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44)
           at org.jboss.el.parser.AstValue.getValue(AstValue.java:63)
           at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
           at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
           at javax.faces.component.UIOutput.getValue(UIOutput.java:173)
           at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:189)
           at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:320)
           at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:200)
           at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:833)
           at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:286)
           at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:262)
           at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:284)
           at org.richfaces.renderkit.html.PanelRenderer.doEncodeBegin(PanelRenderer.java:189)
           at org.richfaces.renderkit.html.PanelRenderer.doEncodeBegin(PanelRenderer.java:148)
           at org.ajax4jsf.renderkit.RendererBase.encodeBegin(RendererBase.java:101)
           at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:785)
           at javax.faces.component.UIComponent.encodeAll(UIComponent.java:884)
           at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
           at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
           at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
           at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
           at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:189)
           at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
           at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
           at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
           at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
           at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
           at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
           at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:154)
           at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:260)
           at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:366)
           at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:493)
           at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
           at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
           at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
           at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
           at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
           at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
           at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
           at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
           at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
           at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
           at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
           at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
           at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
           at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
           at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
           at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
           at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)
           at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
           at java.lang.Thread.run(Thread.java:613)