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POUsing Bean (View Scope) in JSF to show data
 

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    <p>I'm creating an web application, using <strong>JSF (2.0)</strong>. It has <strong>"ViewProducts.xhtml"</strong> to view Product with page. Each time this page loaded, if parameter has some thing (Eg: <strong>page=1 (ViewProduct.xhtml?page=1)</strong>), it's will automatically set the id to setPage property in that Bean. But, i'm keeping getting this error:</p> <blockquote> <p>Unable to create managed bean <strong>categories</strong>. The following problems were found: - Bean or property class bean.Categories for managed bean categories cannot be found.</p> </blockquote> <p>Here is my code (Categories act like a product container):</p> <p><strong>faces-config.xml:</strong></p> <pre><code>&lt;faces-config version="2.0" 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_2_0.xsd"&gt; &lt;navigation-rule&gt; &lt;from-view-id&gt;/template/header.xhtml&lt;/from-view-id&gt; &lt;navigation-case&gt; &lt;from-outcome&gt;ViewCategories&lt;/from-outcome&gt; &lt;to-view-id&gt;/ViewCategories.xhtml&lt;/to-view-id&gt; &lt;/navigation-case&gt; &lt;/navigation-rule&gt; &lt;managed-bean&gt; &lt;managed-bean-name&gt;categories&lt;/managed-bean-name&gt; &lt;managed-bean-class&gt;bean.Categories&lt;/managed-bean-class&gt; &lt;managed-bean-scope&gt;view&lt;/managed-bean-scope&gt; &lt;/managed-bean&gt; </code></pre> <p></p> <p><strong>ViewProducts.xhtml</strong></p> <pre><code>xmlns:c="http://java.sun.com/jsp/jstl/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" &lt;f:metadata&gt; &lt;f:viewParam name="page" value="#{categories.page}"/&gt; &lt;/f:metadata&gt; &lt;h:dataTable value="#{categories.listProduct}" var="cus"&gt; &lt;h:column&gt; &lt;f:facet name="header"&gt;Name&lt;/f:facet&gt; &lt;h:outputText value ="#{cus.name}"&gt;&lt;/h:outputText&gt; &lt;/h:column&gt; &lt;h:column&gt; &lt;f:facet name="header"&gt;Price&lt;/f:facet&gt; &lt;h:outputText value ="#{cus.price}"&gt;&lt;/h:outputText&gt; &lt;/h:column&gt; &lt;/h:dataTable&gt; </code></pre> <p>Categories.java (ManagedBean)</p> <pre><code>public class Categories implements Serializable { /** Creates a new instance of categories */ public Categories() { } private int page = 0; public int getPage() { return page; } public void setPage(int page) { this.page = page; } public List&lt;Product&gt; listProduct = null; public List&lt;Product&gt; getListProduct() { if (listProduct != null) { return listProduct; } else { listProduct = dataAccess.DataAccess.getCategories(this.page); return listProduct; } } public void setListProduct(List&lt;Product&gt; listProduct) { this.listProduct = listProduct; } } </code></pre> <p><strong>Stack trace:</strong></p> <pre><code>com.sun.faces.mgbean.ManagedBeanCreationException: Unable to create managed bean categories. The following problems were found: - Bean or property class bean.Categories for managed bean categories cannot be found. - Bean or property class bean.Categories for managed bean categories cannot be found. - Bean or property class bean.Categories for managed bean categories cannot be found. - Bean or property class bean.Categories for managed bean categories cannot be found. at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:263) at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:86) at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72) at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:69) at org.apache.el.parser.AstValue.getValue(AstValue.java:112) at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:102) at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190) at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:178) at javax.faces.component.UIData.getValue(UIData.java:554) at javax.faces.component.UIData.getDataModel(UIData.java:1248) at javax.faces.component.UIData.setRowIndex(UIData.java:447) at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:81) at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:823) at javax.faces.component.UIData.encodeBegin(UIData.java:937) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1611) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616) at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:380) at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:126) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:127) 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:313) 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.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:662) </code></pre>
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    1. COPlease do not put "Solved" in titles. This isn't a discussion forum. Just mark the answer accepted (you already did). Questions with accepted answers show up with a different answer count color in the listing (yellow instead of white). This is sufficient to distinguish "solved problems" from "unsolved problems".
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