twiddle exception java.lang.ClassNotFoundException: org.jboss.system.ServiceContext

Issue

When trying to  get listDeployed from the command line using twiddle:

twiddle.sh -s jnp://127.0.0.1:1099 -u admin -p admin invoke jboss.system:service=ServiceController listDeployed

results in the following exception. What is missing from the classpath ?

05:57:58,127 ERROR [Twiddle] Exec failed
java.lang.reflect.UndeclaredThrowableException
        at $Proxy0.invoke(Unknown Source)
        at org.jboss.console.twiddle.command.InvokeCommand.invoke(InvokeCommand.java:235)
        at org.jboss.console.twiddle.command.InvokeCommand.execute(InvokeCommand.java:291)
        at org.jboss.console.twiddle.Twiddle.main(Twiddle.java:306)
Caused by: 
java.lang.ClassNotFoundException: org.jboss.system.ServiceContext (no security manager: RMI class loader disabled)
        at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:375)
        at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:165)
        at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:632)
        at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:259)
        at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:209)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1579)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1500)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1736)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1333)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:352)
        at java.util.ArrayList.readObject(ArrayList.java:717)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
        at java.lang.reflect.Method.invoke(Method.java:600)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:986)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1853)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1757)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1333)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:352)
        at java.rmi.MarshalledObject.get(MarshalledObject.java:142)
        at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:134)
        at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:365)
        at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:197)
        at org.jboss.jmx.connector.invoker.client.InvokerAdaptorClientInterceptor.invoke(InvokerAdaptorClientInterceptor.java:66)
        at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:68)
        at org.jboss.proxy.ClientMethodInterceptor.invoke(ClientMethodInterceptor.java:74)
        at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:101)
        ... 4 more