The device does not support yang-library nor netconf-monitoring, so it is required to import schema files manually into the schema cache. If an operator/administrator has forgotten to import all schema files correctly, there is no meaningful error message - but a NullPointerException occurs.

opendaylight-user@root>netconf:connect-device -id VSR -p 830 -P admin -U admin -i 127.0.0.1
Netconf connector added succesfully
opendaylight-user@root>netconf:list-devices
Error executing command: java.lang.NullPointerException
opendaylight-user@root>netconf:show-device -id VSR
Error executing command: java.lang.NullPointerException
opendaylight-user@root>netconf:disconnect-device -id VSR
Netconf connector disconnected succesfully
opendaylight-user@root>netconf:list-devices
NETCONF ID | NETCONF IP | NETCONF Port | Status
---------------------------------------------------------
controller-config | 127.0.0.1 | 1830 | connected

2017-09-06 13:08:31,317 | ERROR | l for user karaf | ShellUtil | 27 - org.apache.karaf.shell.console - 3.0.8 | Exception caught while executing command
java.lang.NullPointerException
at org.opendaylight.netconf.console.impl.NetconfCommandsImpl.listDevices(NetconfCommandsImpl.java:69)
at org.opendaylight.netconf.console.commands.NetconfListDevicesCommand.doExecute(NetconfListDevicesCommand.java:30)
at org.apache.karaf.shell.console.AbstractAction.execute(AbstractAction.java:33)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.karaf.shell.commands.basic.AbstractCommand.execute(AbstractCommand.java:33)[27:org.apache.karaf.shell.console:3.0.8]
at Proxyfee4cdea_a169_4db3_aa7b_653131df28e5.execute(Unknown Source)[:]
at Proxyfee4cdea_a169_4db3_aa7b_653131df28e5.execute(Unknown Source)[:]
at org.apache.felix.gogo.runtime.CommandProxy.execute(CommandProxy.java:78)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:480)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:406)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:182)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:119)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:94)
at org.apache.karaf.shell.console.impl.jline.ConsoleImpl.run(ConsoleImpl.java:210)
at org.apache.karaf.shell.console.impl.jline.LocalConsoleManager$2$1$1.run(LocalConsoleManager.java:109)
at java.security.AccessController.doPrivileged(Native Method)[:1.8.0_131]
at org.apache.karaf.jaas.modules.JaasHelper.doAs(JaasHelper.java:57)[28:org.apache.karaf.jaas.modules:3.0.8]
at org.apache.karaf.shell.console.impl.jline.LocalConsoleManager$2$1.run(LocalConsoleManager.java:102)[27:org.apache.karaf.shell.console:3.0.8]
2017-09-06 13:08:48,666 | ERROR | l for user karaf | ShellUtil | 27 - org.apache.karaf.shell.console - 3.0.8 | Exception caught while executing command
java.lang.NullPointerException
at org.opendaylight.netconf.console.impl.NetconfCommandsImpl.showDevice(NetconfCommandsImpl.java:113)
at org.opendaylight.netconf.console.commands.NetconfShowDeviceCommand.doExecute(NetconfShowDeviceCommand.java:72)
at org.apache.karaf.shell.console.AbstractAction.execute(AbstractAction.java:33)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.karaf.shell.commands.basic.AbstractCommand.execute(AbstractCommand.java:33)[27:org.apache.karaf.shell.console:3.0.8]
at Proxyfee4cdea_a169_4db3_aa7b_653131df28e5.execute(Unknown Source)[:]
at Proxyfee4cdea_a169_4db3_aa7b_653131df28e5.execute(Unknown Source)[:]
at org.apache.felix.gogo.runtime.CommandProxy.execute(CommandProxy.java:78)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:480)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:406)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:182)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:119)[27:org.apache.karaf.shell.console:3.0.8]
at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:94)
at org.apache.karaf.shell.console.impl.jline.ConsoleImpl.run(ConsoleImpl.java:210)
at org.apache.karaf.shell.console.impl.jline.LocalConsoleManager$2$1$1.run(LocalConsoleManager.java:109)
at java.security.AccessController.doPrivileged(Native Method)[:1.8.0_131]
at org.apache.karaf.jaas.modules.JaasHelper.doAs(JaasHelper.java:57)[28:org.apache.karaf.jaas.modules:3.0.8]
at org.apache.karaf.shell.console.impl.jline.LocalConsoleManager$2$1.run(LocalConsoleManager.java:102)[27:org.apache.karaf.shell.console:3.0.8]