HTTP Status 500 - Internal Server Error in glassfish

Add

<jvm-options>-Djavax.xml.accessExternalSchema=all</jvm-options>

line of code in the domain.xml file at glassfish4\glassfish\domains\domain1\config\domain.xml folder

inside <java-config> </java-config> tag as :-

<java-config>
.
.
<jvm-options>-Djavax.xml.accessExternalSchema=all</jvm-options>
</java-config>

Allow 4848 port or stop the firewall and selinux.