Glassfish Error: Uncaught exception: java.lang.NullPointerException and Glassfish stops accepting requests on its port

That issue appears in Glassfish 4. It is documented:

• https://java.net/jira/browse/GRIZZLY-1615?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel
• https://java.net/jira/browse/GLASSFISH-20918?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel

You need to download the patch in the second URL and overwrite the file:

mv nucleus-grizzly-all.jar.1 nucleus-grizzly-all.jar