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Unable to create managed bean. Hello world app.

Dmitry Pidd

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posted 11 years ago

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Did several tutorials and all works fine but this hello world example...

Tomcat Exception

type Exception report

message

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

exception

javax.servlet.ServletException: Unable to create managed bean user.  The following problems were found:
     -[b] Bean or property class UserBean for managed bean user cannot be found.[/b]
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:606)
root cause

com.sun.faces.mgbean.ManagedBeanCreationException: Unable to create managed bean user.  The following problems were found:
     - Bean or property class UserBean for managed bean user cannot be found.
     - Bean or property class UserBean for managed bean user cannot be found.
     - Bean or property class UserBean for managed bean user cannot be found.
	com.sun.faces.mgbean.BeanManager.create(BeanManager.java:265)
	com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
	com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
	com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
	com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
	org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:71)
	org.apache.el.parser.AstValue.getValue(AstValue.java:147)
	org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189)
	com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
	javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
	javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
	javax.faces.component.UIOutput.getValue(UIOutput.java:169)
	com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205)
	com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355)
	com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164)
	javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
	javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764)
	javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
	javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
	javax.faces.component.UIComponent.encodeAll(UIComponent.java:1757)
	javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
	javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
	com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
	com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
	com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
	com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
	com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)

index.xhtml

welcome.xhtml

UserBean.java

And faces-config.xml

Screen-Shot-2012-01-24-at-12.05.49-AM.png

Tim Holloway

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posted 11 years ago

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Don't put UserBean in the default package. Use of the default package is generally discouraged, and some IDEs will even yell at you for using it at all.

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Dmitry Pidd

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Posts: 7

posted 11 years ago

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oh no I tried and tried, and with glassfish and modifying faces-config in a lot of ways,- still doesn't work and it drives me crazy.
I just did put it in com.beans.UserBean and changed faces-config accordingly

javax.servlet.ServletException: Unable to create managed bean user. The following problems were found:
- Bean or property class com.beans.UserBean for managed bean user cannot be found.
javax.faces.webapp.FacesServlet.service(FacesServlet.java:606)

Could my user libraries be a problem?

Screen-Shot-2012-01-24-at-10.00.36-AM.png

Tim Holloway

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posted 11 years ago

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The fact that you got a JSF message means that you did almost everything right. Most people don't get that far on the first try.

I did notice one strange thing:

I don't think that that can even compile considering you didn't list any interface names after "implements". And since JSF backing beans are POJOs, there's no requirement to implement any interfaces anyway.

It doesn't hurt to include a no-argument public constructor on your bean, since "proper" POJOs should. But JSF doesn't require it, especially if you don't have any construction-time code to execute.

Dmitry Pidd

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posted 11 years ago

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Yes with default constructor it worked!! Thank you I spent about 5 hrs, on it. But why it didn't work before then, if bean is POJO?

sorry for implements, I tried Serrializable just to see if it could be a problem and forgot to delete it

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