问题

This question already has an answer here:

Identifying and solving javax.el.PropertyNotFoundException: Target Unreachable 14 answers

I have a problem with JSF 2.2 and CDI, my managerbean is not solved and this error appear

"value="#{userBean.user.name}": Target Unreachable, identifier 'userBean' resolved to null"

This is my manager bean.

@ManagedBean
@RequestScoped
public class UserBean implements Serializable {
    private User user;

    public void setUser(user) {
        this.user = user;
    }
    ...
}

My view is:

<h:form id="login-form">
    <h:outputText value="User"/>
    <h:inputText value="#{userBean.user.name}" id="username"/>

    <h:outputText value="Senha"/>
    <h:inputSecret value="#{userBean.user.password}" id="pasword"/>

    <h:commandButton id="button" value="Login" action="#{userBean.login}"/>

    <h:messages />
</h:form>

回答1:

I want to share my experience with this Exception. My JSF 2.2 application worked fine with WildFly 8.0, but one time, when I started server, i got this "Target Unreacheable" exception. Actually, there was no problem with JSF annotations or tags.

Only thing I had to do was cleaning the project. After this operation, my app is working fine again.

I hope this will help someone!

回答2:

You need

@ManagedBean(name="userBean")
Make sure you have getUser() method.
Type of setUser() method should be void.
Make sure that User class has proper setters and getters as well.

回答3:

I solved this problem.

My Java version was the 1.6 and I found that was using 1.7 with CDI however after that I changed the Java version to 1.7 and import the package javax.faces.bean.ManagedBean and everything worked.

Thanks @PM77-1

来源：https://stackoverflow.com/questions/20504611/target-unreachable-identifier-resolved-to-null-in-jsf-2-2

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