EL resolver in faces-config.xml
While working on a Spring-JSF integration, I'm seeing this entry in faces-config.xml.
<application>
<el-resolver>
org.springframework.web.jsf.el.SpringBeanFacesELResolver
</el-resolver>
</application>
Can someone explain what exactly <application> and <el-resolver> are?
Answer
<application> represents the JSF application. Exactly the one as you can obtain as
Application application = FacesContext.getCurrentInstance().getApplication();
<el-resolver> represents the EL resolver as used by JSF application. Exactly the one as you can obtain as
ELResolver elResolver = application.getELResolver();
What exactly they in turn do can just be read in their javadocs which I've linked above. In a nutshell, the Application basically represents the application-wide JSF configuration and the ELResolver is responsible for evaluating EL expressions in form of #{...}.
In case of SpringBeanFacesELResolver, it decorates the underlying EL resolver to recognize Spring managed beans as well based on Spring's own application context and configuration files. In other words, you'll this way be able to use Spring managed beans in JSF pages via EL.