Read resource bundle properties in a managed bean

Assuming that you've configured it as follows:

<resource-bundle>
    <base-name>com.example.i18n.text</base-name>
    <var>text</var>
</resource-bundle>

If your bean is request scoped, you can just inject the <resource-bundle> as @ManagedProperty by its <var>:

@ManagedProperty("#{text}")
private ResourceBundle text;

public void someAction() {
    String someKey = text.getString("some.key");
    // ... 
}

Or if you just need some specific key:

@ManagedProperty("#{text['some.key']}")
private String someKey;

public void someAction() {
    // ... 
}

If your bean is however in a broader scope, then evaluate #{text} programmatically in method local scope:

public void someAction() {
    FacesContext context = FacesContext.getCurrentInstance();
    ResourceBundle text = context.getApplication().evaluateExpressionGet(context, "#{text}", ResourceBundle.class);
    String someKey = text.getString("some.key");
    // ... 
}

Or if you only need some specific key:

public void someAction() {
    FacesContext context = FacesContext.getCurrentInstance();
    String someKey = context.getApplication().evaluateExpressionGet(context, "#{text['some.key']}", String.class);
    // ... 
}

You can even just get it by the standard ResourceBundle API the same way as JSF itself is already doing under the covers, you'd only need to repeat the base name in code:

public void someAction() {
    FacesContext context = FacesContext.getCurrentInstance();
    ResourceBundle text = ResourceBundle.getBundle("com.example.i18n.text", context.getViewRoot().getLocale());
    String someKey = text.getString("some.key");
    // ... 
}

Or if you're managing beans by CDI instead