我是JSF的新手。据我所知，我做得很好，但仍然得到了这个例外
javax.el.PropertyNotFoundException: /index.xhtml @22,55 value="#{navigator.pages}": Property 'pages' not found on type Navigator
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:111)
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:174)
at javax.faces.component.UIInput.getValue(UIInput.java:291)
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:919)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.el.PropertyNotFoundException: Property 'pages' not found on type Navigator
at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:266)
at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:243)
at javax.el.BeanELResolver.property(BeanELResolver.java:353)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:97)
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
at org.apache.el.parser.AstValue.getValue(AstValue.java:183)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
... 40 more
我已经看过很多关于这个异常的帖子，他们都提到了bean属性和它们的getter/setter，我做得很正确。
这是我的代码：
1） Index.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets">
<!-- When you make your own projects, copy and rename sample-file-with-form.xhtml
or sample-file-no-form.xhtml. Don't copy and rename THIS file, because
this file has too many extraneous things in it. -->
<h:head>
<title>JSF 2.2: Initial Learning Project</title>
<link href="./css/styles.css" rel="stylesheet" type="text/css"/>
</h:head>
<h:body>
<h1 class="title">JSF 2.2: Initial Learning Project</h1>
<div align="center">
<fieldset>
<legend>Selected Results Page</legend>
<h:form>
Please enter the page you want to see.
<br/>
<h:inputText id="pages" value="#{navigator.pages}" /><br />
<h:commandButton value="Go to Selected Page"
action="#{navigator.choosePage}"/>
</h:form>
</fieldset>
</div>
</h:body></html>
2） 我的bean类-Navigator.java
import javax.faces.bean.*;
@ManagedBean
public class Navigator {
private String pages;
public String getPages() {
return pages;
}
public void setPages(String pages) {
this.pages = pages;
}
public String choosePage() {
if(pages == "page1"){
return "page1";
} else if(pages == "page2"){
return "page2";
} else {
return "page3";
}
}
3） web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<context-param>
<description>State saving method: 'client' or 'server' (default). See JSF Specification section 2.5.2</description>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>client</param-value>
</context-param>
<!-- If you go to http://host/project/ (with no file name), it will
try index.jsf first, welcome.jsf next, and so forth.
-->
<welcome-file-list>
<welcome-file>index.jsf</welcome-file>
<welcome-file>welcome.jsf</welcome-file>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
4） faces-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<faces-config
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
version="2.2">
<!-- Empty for now. There are many uses for faces-config.xml, but
the most common are navigation rules (instead of having
the return value of the "action" method be the base filename),
bean declarations (instead of using @ManagedBean), and
properties files (aka resource bundles).
If you are not using faces-config.xml, it is perfectly legal
to omit the file entirely. But, most people prefer to have
a blank one already in their project for later use.
From JSF 2 and PrimeFaces tutorial
at http://www.coreservlets.com/JSF-Tutorial/jsf2/ -->
</faces-config>
请帮我解决这个问题。
字符串的try equals
public String choosePage()
{
if(pages.equals("page1")){
return "page1";
} else if(pages.equals("page2")){
return "page2";
} else {
return "page3";
}
}
尝试以下更改。
将文件名从index.html更改为index.xhtml，并更新如下所述的相同文件名。
<welcome-file>index.html</welcome-file>
编码快乐