pjdb

A wrapper script to enhance jdb. It gives jdb:

• delete command to delete break point with index
• break command to declare conditional break point
• command history
• command completion
• local variable name completion
• class name comletion
• field/method name completion
• command name abbreviation
• reading break points in file at startup
• reading sourcepath in file at startup
• repeating the last command with enter key
• and displays list, where, locals, dump this at every time a thread is suspended
• shortcut keys in source code pane to control the program execution

Dependencies

• rlwrap (>=0.43)
• python3
• tornado
• websocket-client
• ptterm/prompt-toolkit
• pyperclip
• pygments
• javalang

Installation

• install python3

  $ sudo dnf install python3
  

• install rlwrap

  $ git clone https://github.com/hanslub42/rlwrap.git
  $ cd rlwrap/
  $ autoreconf --install
  $ ./configure 
  $ make
  $ sudo make install
  

• install tornado, websocket-client, and ptterm

  $ git clone https://github.com/hokuda/pjdb.git
  $ cd pjdb
  $ pip3 install --user -r requirements.txt
  

  Note: You may need to install one of the copy/paste mechanisms listed here

• install pjdb

  $ cp pjdb pjdb_filter ${path_to_your_favorite_bin_directory}
  

How to use

  # pjdb [jdb options]

pjdb passes all options to jdb.

Features

delete command

delete command shows break points with indeces. delete # command deletes the #th break point.

  > delete
       0 Test:22
       1 Test:23 if arg.equals("test1")
       2 Test:24
       3 Test.test()
  > delete 2
  Deleted: Test:24
  > delete
       0 Test:22
       1 Test:23 if arg.equals("test1")
       2 Test.test()
  > 

break command

break command shows break points with indeces.

break <class>.<method>[(argument_type,...)] command sets a break point in a method.

break <class>:<line> command sets a break point at a line. A break point at a line can have a condition by using if in the arguments to the break command like break <class>:<line> if <condition>. <condition> must be a boolean Java expression.

> break
     0 Test:22
     1 Test:23 if arg.equals("test1")
     2 Test.test()
> break Test:24 if arg.equals("test2")
Added "Test:24 if arg.equals("test2")"
> break
     0 Test:22
     1 Test:23 if arg.equals("test1")
     2 Test.test()
     3 Test:24 if arg.equals("test2")
> 

command history

C-r and C-s are available to search history. If the pjdb.history file exists in the current directory, pjdb reads it at startup. The command history is saved when pjdb exits.

completion

Hitting TAB key fills in the rest of an item.

command name abbreviation

s => step
c => cont
p => print
n => next
w => where
d => dump
l => list
b => break

reading break points in file at startup

If the pjdb.breakpoint file exists in the current directory, pjdb reads it and set break points at startup.

reading sourcepath in file at startup

If the pjdb.sourcepath file exists in the current directory, pjdb reads it and set source paths at startup.

repeating the last command with enter key

After executing step, cont, and next command, hitting ENTER key repeats the last command.

shortcut keys in source code pane to control the program execution

Shortcut keys are available in source code pane to step through your code and set break points.

s => step
n => next
u => step up
c => cont
b => set/remove break point at the current line

Author

Hisanobu Okuda [email protected]