How does BeanShell resolve an unqualified variable reference at runtime?

When a script references a variable name without qualifying it, like just writing x rather than someObject.x, BeanShell looks it up starting in the current namespace, checking whether a variable by that name has been defined locally in the current scope.

If it's not found locally, BeanShell walks outward through enclosing namespaces, the scope chain a closure or nested block was defined within, continuing to search parent scopes until either a matching variable is found or the search reaches the outermost scope with nothing found.

If no variable is ultimately found anywhere in that chain, referencing it typically results in an error at that point in execution, since unlike some purely dynamic languages, BeanShell doesn't silently treat every unresolved name as automatically null or as an implicitly created new variable in every context.

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