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I write a Java method in JShell and now I want to debug it. I would like to set breakpoints or at least step through an execution line-by-line. Does JShell have these debugging abilities?
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To start Jshell, first we must have installed Java 9 then open terminal in Linux or command prompt in windows and type jshell. It will start jshell session and displays a welcome message to the console. To display a simple “Hello Java” message, write print command without creating class and hit enter.
As a user I would suggest the following: make a hotkey to exit the loop in debugging mode, for example ctrl-shift-F11.
Just to clarify further, from the JEP: The Java Shell (Read-Eval-Print Loop) itself, the Non-Goals states :
Out of scope are graphical interfaces and debugger support. The JShell API is intended to allow JShell functionality in IDEs and other tools, but the
jshelltool is not intended to be an IDE.
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There is some undocumented /debug command (Jshell in Java 11). After /help /debug command you can see:
jshell> /help /debug
Display debugging information for the jshell tool implementation.
0: Debugging off
r: Tool level debugging on
g: General debugging on
f: File manager debugging on
c: Completion analysis debugging on
d: Dependency debugging on
e: Event debugging on
Notice, if you write /help only there is no information about /debug command.
Out of Jshell there is jdb tool for debug.
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