Unexpected exception from Plugin: java.lang.NullPointerException starting OHS HTTP Server

the problem: you used DOMAIN/bin/installNodeMgrSvc.cmd to install the OHS node manager, and when starting the OHS using startComponent.cmd ohs1 you get –> Server start command for OHS server ‘ohs1’ failed due to: Unexpected exception from Plugin: java.lang.NullPointerException

Starting System Component ohs1 ...

Initializing WebLogic Scripting Tool (WLST) ...

Welcome to WebLogic Server Administration Scripting Shell

Type help() for help on available commands

Reading domain from C:/Oracle/Middleware/Oracle_Home/user_projects/domains/dev2_domain

Please enter your password :
Connecting to Node Manager ...
Successfully Connected to Node Manager.
Starting server ohs1 ...
Error Starting server ohs1: weblogic.nodemanager.NMException: Received error message from Node Manager Server: 
[Server start command for OHS server 'ohs1' failed due to: Unexpected exception from Plugin: java.lang.NullPointerException. 
Please check Node Manager log and/or server 'ohs1' log for detailed information.]. Please check Node Manager log for details.
Successfully disconnected from Node Manager.

Exiting WebLogic Scripting Tool.

Done

this is a bug! (16883059) fix this suckah by doing the following:

1. you need to uninstall the nodemanager service

   cd DOMAIN\bin\
   uninstallNodeMgrSvc.cmd

2. set the following java options first and then install the nodemanager service again:

   cd DOMAIN\bin
   set JAVA_OPTIONS=-Dohs.product.home=<product_home> -Dweblogic.rootdirectory=<domain_directory>
   installNodeMgrSvc.cmd

   example:

   -Dohs.product.home=C:\\Oracle\\Middleware\\Oracle_Home\\ohs -Dweblogic.rootdirectory=C:\\Oracle\\Middleware\\Oracle_Home\\user_projects\\domains\\base_domain
   installNodeMgrSvc.cmd

3. start the Nodemanager service

4. start OHS using the startComponent.cmd command again. you should be all set