I'm using jdk.jshell.JShell to evaluate Java code programmatically and I'd like to add a local variable to the active evaluation context, so the value is useable in the shell.
I'm instantiating the JShell with a DirectExecutionControl, so it runs on the same JVM as the main code. I've spent quite a lot of time stepping through the source code of the JDK trying to see where I could plug myself, but it's quite opaque; simply getting an Object result out of eval(...) instead of a String required a number of hacks (Oracle, why?).
The answer here seems to suggest that this is not possible, without justification, but I'm too deep into this to accept that.
Ideas I have thought about:
- creating a class dynamically, with a field corresponding to the variable I want to add, and `import static`ing that class into the JShell (but I don't know how to dynamically add an import either)
- trying to find one of the internal auto-generated classes JShell is using to store the variables, and replacing them using arcane reflection magic
