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

That issue appears in Glassfish 4. It is documented:

• GRIZZLY-1615
• GLASSFISH-20918

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

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