JSF CRUD Tutorial

Following instructions at https://netbeans.org/kb/docs/web/jsf20-crud.html
at end of "Creating the Web Application Project" was curious so in Libraries - GlassFish Server 4, expanded javax.servlet.jsp.jstl.jar - org.apache.taglibs.standard.tag.common.xml - ParseSupport.class it opened a generated source file. I noticed the button "Attach Sources"
I then used https://blogs.oracle.com/geertjan/entry/how_to_set_up_glassfish1 as a guide to download the sources. I did Team - Subversion -Checkout - Repository URL: https://svn.java.net/svn/jstl~svn and downloaded to a new folder java.net-src\jstl in the NetBeans projects folder. Then I clicked the "Attach Sources..." button and added the folder %USERPROFILE%\Documents\NetBeansProjects\java.net-src\jstl\javax.servlet.jsp.jstl-1.2.1\src\main\java.
Going back to the .class files under the javax.servlet.jsp.jstl.jar file I am now able to double-click one and see the source.