Java Tools Tutorials - Herong's Tutorial Notes - Version 5.31, by Dr. Herong Yang
Listing Debugging Commands with 'help' Command
This section lists some commonly used 'jdb' commands by running the 'help' command.
Ok, I think we did enough excises about launching the debugger and connecting to the target application. Let's now move on to look at some debugging commands.
Here is list of commonly used debugging commands. I got this list by using "help" at debugging prompt.
C:\herong>jdb > help connectors -- list available connectors and transports in this VM run [class [args]] -- start execution of application's main class threads [threadgroup] -- list threads thread <thread id> -- set default thread suspend [thread id(s)] -- suspend threads (default: all) resume [thread id(s)] -- resume threads (default: all) where [<thread id> | all] -- dump a thread's stack wherei [<thread id> | all]-- dump a thread's stack, with pc info up [n frames] -- move up a thread's stack down [n frames] -- move down a thread's stack kill <thread id> <expr> -- kill a thread with the given exception object interrupt <thread id> -- interrupt a thread print <expr> -- print value of expression dump <expr> -- print all object information eval <expr> -- evaluate expression (same as print) set <lvalue> = <expr> -- assign new value to field/variable/array element locals -- print all local variables in current stack frame classes -- list currently known classes class <class id> -- show details of named class methods <class id> -- list a class's methods fields <class id> -- list a class's fields threadgroups -- list threadgroups threadgroup <name> -- set current threadgroup stop in <class id>.<method>[(argument_type,...)] -- set a breakpoint in a method stop at <class id>:<line> -- set a breakpoint at a line clear <class id>.<method>[(argument_type,...)] -- clear a breakpoint in a method clear <class id>:<line> -- clear a breakpoint at a line clear -- list breakpoints catch [uncaught|caught|all] <class id>|<class pattern> -- break when specified exception occurs ignore [uncaught|caught|all] <class id>|<class pattern> -- cancel 'catch' for the specified exception watch [access|all] <class id>.<field name> -- watch access/modifications to a field unwatch [access|all] <class id>.<field name> -- discontinue watching access/modifications to a field trace [go] methods [thread] -- trace method entries and exits. -- All threads are suspended unless 'go' is specified trace [go] method exit | exits [thread] -- trace the current method's exit, or all methods' exits -- All threads are suspended unless 'go' is specified untrace [methods] -- stop tracing method entrys and/or exits step -- execute current line step up -- execute until the current method returns to its caller stepi -- execute current instruction next -- step one line (step OVER calls) cont -- continue execution from breakpoint list [line number|method] -- print source code use (or sourcepath) [source file path] -- display or change the source path exclude [<class pattern>, ... | "none"] -- do not report step or method events for specified classes classpath -- print classpath info from target VM monitor <command> -- execute command each time the program stops monitor -- list monitors unmonitor <monitor#> -- delete a monitor read <filename> -- read and execute a command file lock <expr> -- print lock info for an object threadlocks [thread id]-- print lock info for a thread pop -- pop the stack through and including the current frame reenter -- same as pop, but current frame is reentered redefine <class id> <class file name> -- redefine the code for a class disablegc <expr> -- prevent garbage collection of an object enablegc <expr> -- permit garbage collection of an object !! -- repeat last command <n> <command> -- repeat command n times # <command> -- discard (no-op) help (or ?) -- list commands version -- print version information exit (or quit) -- exit debugger
Last update: 2015.
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