eval
Evaluates a Java expr (optionally preceded by an action statement block) inside a generated Main.getValue() method, prepending any registered imports and variable declarations.
Variables added with add are bound first, including any added after an earlier evaluation.
Return
the result of evaluating expr, or null if it evaluates to null
Parameters
expr
the Java expression whose value is returned
action
optional Java statements executed before expr is evaluated
verbose
if true, logs the generated script before evaluation