HouseMD is a interactive command-line tool for dianosing Java process in runtime. It's inspiration came from BTrace, but more easier to use and more safer.

Features

Display loaded classes information
- name
- source file(.class or .jar)
- classloaders
Display invocation trace summary
- method full name and sign
- class loader of method declaring class
- total invoked times
- avg elapse millis
- self instance
Output invocation detail
- timestamp
- elapse millis
- call thread
- this object
- class name
- method name
- arguments
- result or exception
Output invocation stack trace
Display object field value
Display enviroment variable
Auto-completion by typing Tab
navigate command history by up and down, and support Ctrl + R for searching
Awesome features you can provide by forking me

Test cases would show more specification details.

Getting started

Pre-requirement

JDK 6
sbt

Install from jenv

install jenv
execute command line: $ jenv install housemd

Build from code

$ git clone https://github.com/zhongl/HouseMD.git housemd
$ cd housemd
$ sbt proguard

A runnable jar named housemd_x.x.x-x.x.x.min.jar should be generated blow target/scala-x.x.x/

Caution: Windows are not supported yet.

Run it

$ java -Xbootclasspath/a:$JAVA_HOME/lib/tools.jar -jar housemd_x.x.x-x.x.x.min.jar [OPTIONS] <pid>

Caution: In Mac OSX, the -Xbootclasspath is no needed. You can created launch script as a shortcut.

How to use

First all, suppose you created launch script file named housemd, type:

> ./housemd -h

A help infomation shows up like:

Usage: housemd [OPTIONS] pid
	a runtime diagnosis tool of JVM.
Options:
	-h, --help
		show help infomation of this command.
	-p, --port=[INT]
		set console local socket server port number.
		default: 54321
Parameters:
	pid
		id of process to be diagnosing.

Suppost your target pid is 1234 (you can use jps or ps get it), and then input:

> ./housemd 1234

After seen prompt housemd>, input help then you get help infomation like this:

housemd> help

quit      terminate the process.
help      display this infomation.
trace     display or output infomation of method invocaton.
loaded    display loaded classes information.
env        display system env.
inspect    display fields of a class.

You can also input help loaded and get help infomation of loaded as blow:

housemd> help loaded
Usage: loaded [OPTIONS] name
    display loaded classes information.
Options:
    -h, --classloader-hierarchies
        display classloader hierarchies of loaded class.
Parameters:
    name
        class name without package name.

More about commands

Click here to see the use cases.

Having fun!

zaykl/HouseMD