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this was an interview question posed to me..I vaguely answered it uses Java reflections..but I was not sure. how does that work?
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Eclipse allows running an application in Debug mode which helps with stepping through each line of code in a program. Eclipse also provides a Debug Perspective which is a set of views grouped together that help inspect code and make the debugging process very effective.
Variables/Expression view – Shows the declared variables and their values. Press Ctrl+Shift+d or Ctrl+Shift+i on a selected variable or expression to show its value. You can also add a permanent watch on an expression/variable that will then be shown in the Expressions view when debugging is on.
6. Drop to frame. Eclipse enables users to choose any frame (level) in the call stack during the debugging process and set the JVM to start again from the selected level. In simple words, it allows you to re-run a part of your program.
The key to your question is almost certainly java.lang.reflect.AccessibleObject, which allows the debugger to turn off the access control checks and poke around. Spring uses the same mechanism to get access to the variables for dependency injection.
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