The JSimInvalidContextException is thrown whenever the user tries to call a method that cannot be invoked
from the piece of code currently being executed.
The JSimInvalidProcessStateException is thrown whenever an attempt is made to change a process's state
with JSimProcess.setProcessState() but there is not a transition between the current and the desired
state in the graph of J-Sim process states.
All message classes implementing this interface assure that their receiving process
can be obtained and it is a single specific process, not a set of processes, all processes,
or an unspecified process.
All message classes implementing this interface assure that their sending process
can be obtained and it is a single specific process, not a set of processes, all processes,
or an unspecified process.