Steps to reproduce
Run simulated device (version of testtool depends on branch)
 ·	:~/netconf/netconf/tools/netconf-testtool/target$ java -jar netconf-testtool-1.8.0-executable.jar 
Run ODL 
 ·	:~/netconf/karaf/target/assembly/bin$ ./karaf
 ·	install features:
	- odl-netconf-topology
	- odl-restconf-nb-rfc8040
	- odl-mdsal-apidocs
Send this request (I recommed to use Postman)
PUT http://localhost:8181/rests/data/network-topology:network-topology/topology=topology-netconf/node=device-17830
Headers:
 ·	Content-Type : application/json
 ·	Accept : application/json
Authorization : basic (admin:admin)
Body:
{
    "node": [
        {
            "node-id": "device-17830",
		"netconf-node-topology:port": 17830,
            "netconf-node-topology:reconnect-on-changed-schema": false,
            "netconf-node-topology:connection-timeout-millis": 20000,
            "netconf-node-topology:tcp-only": false,
            "netconf-node-topology:max-connection-attempts": 0,
            "netconf-node-topology:username": "admin",
            "netconf-node-topology:password": "admin",
            "netconf-node-topology:sleep-factor": 1.5,
            "netconf-node-topology:host": "127.0.0.1",
            "netconf-node-topology:between-attempts-timeout-millis": 2000,
            "netconf-node-topology:keepalive-delay": 120
        }
    ]
}

In Magnesium branch, way to reproduce bug was following:
Open this site in your browser:
http://localhost:8181/apidoc/18/explorer/index.html
Click on "Mounted Resources" and then on the mount point 
"/network-topology:network-topology/topology=topology-netconf/node=device-17830/" which you created while ago.
You should see this error:

When you check your "karaf.log" file, you shoud see that java.lang.NumberFormatException has occured. 
My logs will be attached in "[NETCONF-649] karaf.log" file in JIRA task.
In master branch or last release (v2.0.9):
Open this site in your browser:
http://localhost:8181/apidoc/explorer/index.html
As code has shifted, appearance of ODL RestConf API documentation has changed and error 500 does not apper again.