 default <code>ContextService</code>
 instance, <code>java:comp/DefaultContextService</code>.
 <p>
 The name of the <code>ContextService</code> must be no more granular
 than the name of this <code>ManagedScheduledExecutorDefinition</code>. For example,
 if this <code>ManagedScheduledExecutorDefinition</code> has a name in <code>java:app</code>,
 the <code>ContextService</code> can be in <code>java:app</code> or <code>java:global</code>,
 but not in <code>java:module</code> which would be ambiguous as to wh