Forum:

javax.el.PropertyNotFoundException: /index.xhtml @17,44 value="#{user.Name}": Target Unreachable, id

Ranch Hand

Posts: 48

posted 12 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Hi,

I am running sample JSF with a

1. login page asking for the user name and password.
2. after entering the user name and password, greet the user with Hello User Name..

Here are the configuration details.
1. Eclipse Helios
2. Tomcat 6
3. JSF Version 2

The following are the list of files.

1. index.xhtml - containing the input boxes for user name and password.
2. User.java - Bean having the properties for user name and password. once after entering the user name and password at index.xhtml values need to be stored here.
3. welcome.xhtml - This will retrieve the user name from user.java and put a message..

I have attached my files here.

1.index.html

2. User.java

3. welcome.xhtml

4.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"
   xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
      http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   version="2.5">
   <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>/faces/*</url-pattern>
   </servlet-mapping>
   <welcome-file-list>
      <welcome-file>faces/index.xhtml</welcome-file>
   </welcome-file-list>
   <context-param>
      <param-name>javax.faces.PROJECT_STAGE</param-name>
      <param-value>Development</param-value>
   </context-param>
   <context-param>
    <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
    <param-value>.xhtml</param-value>
</context-param>
</web-app>

5.faces-config.xml

Here are the list of libraries I am using..
javax.faces.jar
jstl-1.2.jar

I am able to see the login page and after input the user name and password and click on login button I could see the following error.

javax.el.PropertyNotFoundException: /index.xhtml @17,44 value="#{user.Name}": Target Unreachable, identifier 'user' resolved to null
	at com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:100)
	at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:95)
	at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1028)
	at javax.faces.component.UIInput.validate(UIInput.java:958)
	at javax.faces.component.UIInput.executeValidate(UIInput.java:1209)
	at javax.faces.component.UIInput.processValidators(UIInput.java:698)
	at javax.faces.component.UIForm.processValidators(UIForm.java:244)
	at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1086)
	at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1086)
	at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1165)
	at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:508)
	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:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:662)

Please help me in resolving this..

Thanks,
Suresh.

ban Parth

Greenhorn

Posts: 2

posted 12 years ago

1
Number of slices to send:

Optional 'thank-you' note:

Send

i too got this error ...i cant't too fix it!!!

Wayne Wong Qi Yuan

Greenhorn

Posts: 4

posted 12 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

i also got this problem... anyone can help?

Tim Holloway

Saloon Keeper

Posts: 28468

210

I like...

posted 12 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

You defined the bean with a name of "User" but you're referencing it under a name of "user". Java is case-sensitive, so the name does not resolve.

Some additional notes:

1. JSF object names are instance names, not class names, so they should not begin with an upper-case letter.

2. Writing your own login code is suicide. J2EE has a truly secure login mechanism and it doesn't require user-written code.

Often the most important part of the news is what they didn't tell.

kalle suresh

Ranch Hand

Posts: 48

posted 12 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Hi,

I tried changing the User to user and the properties which I am referring in xhtml as the way they are declared in bean class. But no luck.

Tim Holloway

Saloon Keeper

Posts: 28468

210

I like...

posted 12 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

kalle suresh wrote:Hi,

I tried changing the User to user and the properties which I am referring in xhtml as the way they are declared in bean class. But no luck.

I recommend that you study up on basic Javabeans and POJOs. And maybe fundamental Java conventions.

Most of your problems are not related to JSF or web programming, but are due to failure to observe these conventions. Java class names begin with an uppercase letter. instance names do not and that includes property names. So it's not "#{User.Name}" or "#{user.Name}", it's "#{user.name}" and the get/set methods on the backing bean are named "getName()" and "setName()".

Often the most important part of the news is what they didn't tell.

long shan

Greenhorn

Posts: 1

posted 12 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

kalle suresh wrote:Hi,

I am running sample JSF with a

1. login page asking for the user name and password.
2. after entering the user name and password, greet the user with Hello User Name..

Here are the configuration details.
1. Eclipse Helios
2. Tomcat 6
3. JSF Version 2

The following are the list of files.

1. index.xhtml - containing the input boxes for user name and password.
2. User.java - Bean having the properties for user name and password. once after entering the user name and password at index.xhtml values need to be stored here.
3. welcome.xhtml - This will retrieve the user name from user.java and put a message..

I have attached my files here.

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:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <h:head> <title> Welcome </title> </h:head> <h:body> <h:form> <h3>Please enter your name and password</h3> <table> <tr> <td>Name:</td> <td><h:inputText value="#{user.Name}"/></td> </tr> <tr> <td>Password:</td> <td><h:inputSecret value="#{user.Password}"/></td> </tr> </table> <p><h:commandButton value="Login" action="welcome"/></p> </h:form> </h:body> </html>

2. User.java
package com.corejsf; import java.io.Serializable; import javax.faces.bean.ManagedBean; // or import javax.inject.Named; import javax.faces.bean.SessionScoped; // or import javax.enterprise.context.SessionScoped; @ManagedBean(name="User") // or @Named("user") @SessionScoped public class User implements Serializable { /** * */ private static final long serialVersionUID = 1L; private String name; private String password; public String getName() { return name; } public void setName(String newValue) { name = newValue; } public String getPassword() { return password; } public void setPassword(String newValue) { password = newValue; } }

3. welcome.xhtml

<!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:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <h:head> <title>Welcome</title> </h:head> <h:body> <h3>Welcome to Java Server Faces, #{user.name}!</h3> </h:body> </html>

4.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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <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>/faces/*</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>faces/index.xhtml</welcome-file> </welcome-file-list> <context-param> <param-name>javax.faces.PROJECT_STAGE</param-name> <param-value>Development</param-value> </context-param> <context-param> <param-name>javax.faces.DEFAULT_SUFFIX</param-name> <param-value>.xhtml</param-value> </context-param> </web-app>

5.faces-config.xml
<?xml version="1.0" encoding="UTF-8"?> <faces-config 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" version="2.0"> </faces-config>

Here are the list of libraries I am using..
javax.faces.jar
jstl-1.2.jar

I am able to see the login page and after input the user name and password and click on login button I could see the following error.

javax.el.PropertyNotFoundException: /index.xhtml @17,44 value="#{user.Name}": Target Unreachable, identifier 'user' resolved to null at com.sun.faces.facelets.el.TagValueExpression.getType(TagValueExpression.java:100) at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:95) at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1028) at javax.faces.component.UIInput.validate(UIInput.java:958) at javax.faces.component.UIInput.executeValidate(UIInput.java:1209) at javax.faces.component.UIInput.processValidators(UIInput.java:698) at javax.faces.component.UIForm.processValidators(UIForm.java:244) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1086) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1086) at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1165) at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:508) 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:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:662)

Please help me in resolving this..

Thanks,
Suresh.

i think you havn't study JSF good,y or n?

Tim Holloway

Saloon Keeper

Posts: 28468

210

I like...

posted 12 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

OK, I could make my usual comment about how user-written login processing means that the webapp comes pre-supplied with security problems from the start, but the particular problem you are having stems from you not understanding how JavaBeans work.

The convention for JavaBeans - and Java in general - is that classnames start with an uppercase letter and class instance and member names start with a lower-case letter. So the bean should be named "user", not "User". On the @ManagedBean annotation, simply removing the "name=" parameter will accomplish that, since the default name generated is the class name with its initial letter folded to lower-case. At the moment, you are failing to find the "user" object because the EL resolver is case-sensitive and cannot find an object named "User" using the id of "user".

That's problem #1. Problem #2 is similar. As I said, member (property) names also must start with a lower-case letter, so instead of "#{user.Name}", it has to be "#{user.name}". The property accessor methods in the User class will then be getName() and setName().

Often the most important part of the news is what they didn't tell.

Ramy Nady

Ranch Hand

Posts: 115

posted 10 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Tim Holloway wrote:

Some additional notes:

1. JSF object names are instance names, not class names, so they should not begin with an upper-case letter.

2. Writing your own login code is suicide. J2EE has a truly secure login mechanism and it doesn't require user-written code.

This notes fixed my problem also

I was using the bean name UserMovieBean in my xhtml pages , when I moved it to userMovieBean it is working as expected.
"instance names, not class names,can't begin with upper-case letter"

Thanks a lot for your help

R.Diab OCEWSD6,OCAJP8,OCPJP8,OCEWCD6,OCEJPAD6,OCEEJBD6,

Sometimes you feel like a nut. Sometimes you feel like a tiny ad.

Smokeless wood heat with a rocket mass heater

https://woodheat.net